Difference between revisions of "PRad Weekly Meetings"

From Pcrewiki
Jump to navigationJump to search
Line 6: Line 6:
 
* <u>Minutes: </u>  
 
* <u>Minutes: </u>  
 
*[[File:GEM_KG.pdf]]
 
*[[File:GEM_KG.pdf]]
 +
*[[File:Gem1.pdf]]
  
 
===November 13===
 
===November 13===

Revision as of 09:22, 20 November 2015

PRad phone meetings are held every Friday at 10:00 am EST.

2015

November 20

November 13

  • Participants : Ashot, Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Xinzhan
  • Minutes:
    1. Readiness review close out is discussed.
    2. Integration of GEM DAQ and solve the rate issue, this requires expert's help ASAP.
    3. Simulation for residue gas and detailed GEM frame

November 6

  • Participants : Ashot, Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Xinzhan
  • Minutes:
  • File:DAQ.pdf

October 30

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Krishna, Li, Mahbub, Xinzhan
  • Minutes:

October 23

  • Participants : Ashot, Eugene, Chao, Chris, Dipangkar, Haiyan, Krishna, Li, Mahbub, Xinzhan
  • Minutes:
    1. GEM noise issue is solved.
  • File:Bai GEM Update.pdf

October 16

  • Participants : Ashot, Eugene, Chao, Chris, Dipangkar, Haiyan, Krishna, Li, Mahbub
  • Minutes:
    1. Readiness review date is changed to 11/12/2015.
    2. Gem support details finished.
    3. Gem chamber is being tested at UVA by Xinzhan.
    4. measurements needed for the length of legs under Hycal.
    5. Target is fully installed at EEL building, will run the target sys next week.
    • The presentation list needed for readiness review.
      1. Physics Motivation (Haiyan)
      2. General Layout of the Experiment
      3. Equipment Status - Target (Chris)
      4. Equipment Status - HyCal
      5. Equipment Status - GEM (Kondo?)
      6. General Engineering - Vacuum box, beamline and installation schedule (Bob?)
      7. Online and Offline Software - DAQ and Analysis
    • The assignment of the charge items
      1. Item 1: Ashot
      2. Item 2: Ashot
      3. Item 3: Ashot
      4. Item 4: Eugene
      5. Item 5: Eugene
      6. Item 6: Dipangkar
      7. Item 7: Mahbub
      8. Item 8: Eugene

October 9

  • Participants : Chao, Dipangkar, Haiyan, Krishna, Li, Mahbub，Xinzhan
  • Minutes:
    1. Readiness review date is changed to 11/05/2015.

October 2

  • Participants : Ashot, Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub，Xinzhan
  • Minutes:
    1. Readiness review is scheduled to be 11/04/2015.
    2. Items to prepare: Target documents from Chris, plots for simulation and radius extraction, GEM test results, plots for software package, and so on.

September 25

September 18

  • Participants : Ashot, Dipangkar, Mahbub, Krishna, Li, Xinzhan
  • Minutes:
    1. Hall B asked to update our status on Oct.25th meeting, further details and preparations will be discussed next meeting
    2. The temperature monitor black box is missing, need to ask Chris on next Monday
    3. Krishna, Li, Xinzhan will keep working on the small Gem test system and set up in the hall for testing ASAP
    4. Xinzhan, Li will test our first Gem chamber at JLab and present some results before Oct.25
    5. PMTs have been ordered by Mahbub
    6. The PRad mailing list will be taken care of by Li

September 11

  • Participants : Ashot, Chao, Dipangkar, Eugene, Krishna, Li, Mahbub
  • Minutes:
  • PRad configuration

September 4

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Krishna, Li, Xinzhan
  • Minutes:
    1. Beamline design, GEM mount as shown in the file.=
  • GEM mount

August 28

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Mahbub, Krishna, Li, Xinzhan
  • Minutes:
    1. The simulation shows a 1 um thick Berylium window can be utilized as the solid target.
  • File:SolidTargetSimulation.pdf

August 21

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Haiyan, Mahbub, Krishna, Li, Xinzhan
  • Minutes:
    1. Beamline design, only the downstream connection part between the vacuum tube and beam line needs some work.
    2. Start working on the integration of GEM DAQ.

August 14

  • Participants : Chao, Dipangkar, Eugene, Kondo, Krishna, Li, Xinzhan
  • Minutes:
    1. HV board and aluminum sheets are arriving.
    2. Spare power supply of GEM is expected to arrive in the end of August.
    3. Kondo's talk about GEM status. See attached presentation.
  • File:GEMstatus08142015.pdf
  • Beam Line

August 7

  • Participants : Ashot, Chao, Dipangkar, Eugene, Li, Krishna, Mahbub, Zhihong
  • Minutes:
    1. Integration of GEM DAQ will start in Septmeber.
    2. One of the pump is problematic, now is negotiating for replacement.

July 31

  • Participants : Ashot, Chao, Eugene, Li, Krishna
  • Minutes:
    1. Beamline design is progressing with the help from Gary (Duke)
    2. Dipangkar: 2nd chamber would be ready by the end of October-beginning of Nov, and Nilanga's student Xinzhan will work with Krishna on the GEM DAQ and reconstruction.

July 10

  • Participants : Ashot, Chao, Dipangkar, Eugene, Li, Haiyan, Kondo, Mahbub
  • Minutes:
    1. Duke will help with the beamline design
    2. Readiness review is coming in November

June 26

  • Participants : Chao, Dipangkar, Eugene, Krishna, Kondo
  • Minutes:
    1. Aluminum sheets ordered, will be able to make four windows
    2. First chamber of GEM is working, but the noise level is unexpectedly high
    3. CODA system for GEM, test is successful, but still need more work to complete the integration.
    4. Pumping speed is a little bit lower than specs, motion system is improved.

June 12

  • Participants : Ashot, Chao, Chris, Eugene, Kondo, Krishna, Mahbub, Zhihong
  • Minutes:
    1. Kondo: first chamber of GEM is completed and tested, will be tested with the DAQ system soon.
    2. Chris: target assembled except some wiring works
    3. Mahbub: Requisition for the spare pump done

June 5

  • Participants :
  • Minutes:

May 29

  • Participants : Chao, Chris, Eugene, Haiyan, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Chris:
      • The big pumps are mounted on the chamber. The smaller ones will be mounted next week and Chris plans to have all 4 run for about a week.
      • The design work of the motion mechanism to make it more rigid is completed and all the drawings have been sent to the machinist with however not a very high priority.
    2. Mahbub: received the quotes of the spare pumps, GEM and Booster power supplies.

May 22

  • Participants : Ashot, Chao, Dipangkar, Eugene, Haiyan, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Eugene:
      • Chris said that the pump was fully repaired and free of charges and they were supposed to arrived yesterday (Thursday) at JLab. The plan is to have it run for a week straight on the chamber.
      • The design work of the motion mechanism to make it more rigid is completed.
      • Beamline plan: Rolf has all the info in hands. The design needs to start no later than early summer and be done by September so that October and November will be used for procurement in order to have everything at JLab by Christmas.
    2. GEM: more delays and will be done assembled and tested mid-June. Krishna will be at UVa to test the DAQ around this time.
    3. Spare items to buy with the remaining MRI funds ($43.3k): spare pumps, GEM material, booster power supplies, window material.

May 8

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Krishna, Li, Mahbub, Mehdi
  • Minutes:
    1. DAQ computer: Ashot brought the tagged computer to JLAB. Chao will take care of registering its MAC address.
    2. Pumps: Chris did not get an answer from Pfeiffer after multiple attempts. I will try once again next week. His plan for the fall is to test the whole system for a whole week. James redesigned the motion system and will assemble it over the summer.
    3. GEM: the GEM DAQ works perfectly fine by itself but has synchronization issue when other ROC are added. A beam test will be done next Wednesday in HallA. Dipangkar and Krishna will go to UVA at the end of May for a full test of the DAQ with the GEM chambers.
    4. list of spare items:
Item Cost Comments
HiPace 2300 $29.6k
Cryocooler $33k
Backing pumps
Al Window sheet $2,488 each
Temperature controller + sensors $5,100
Booster and other power supplies
Target Foil
Chiller for HyCal
DAQ modules
Mass flow controller $1550 Use MSU funds

May 1

  • Participants : Ashot, Chao, Dipangkar, Eugene, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Booster: Need to work on the interlock
    2. GEM: Dipangkar and Krishna worked on the test of the full DAQ in HallA
    3. Pumps: No news yet from Pfeiffer
    4. Spare items: Dipangkar will order a flow controller with his remaining funds. Will look into spare items for GEM. Mehdi will look into spare pumps. We will need to take a decision by the end of May.
    5. Beamline: Eugene is almost done put things together for the beamline work and will give it to Rolf next week.

April 10

  • Participants : Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Booster: little problem in retrieving IP info. Need to talk to Sergei and check the MAC addresses.
    2. DAQ: Computer will come probably next week if no further delays.
    3. Vacuum Box: needs to be inspected
    4. GEM: Dipangkar and Krishna did not go to UVA last week but will go next because one computer crashed and they need to work on it.
    5. Simulation for solid target is still running

April 3

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Haiyan, Krishna, Li, Mark, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Booster: IP 167 has no slot left, need to connect the booster on 160 and thus need a longer cable to connect to the switch under the stairs.
    2. DAQ: Computer will come probably next week.
    3. Vacuum Box and beamline: the box is at JLab. We need to provide Rolf with all the calculations for the window with hole but Bob is pretty busy.
    4. Pumps: Pfeiffer identify the problem. It is a bad sensor on the magnetic bearing. James is taking apart the motion mechanism of the target and is making it more robust in order to have it completed bu this summer
    5. GEM: Dipangkar and Krishna will got to UVA next week to test their DAQ and electronic.
    6. Accelerator: down until next Friday and will be back with 6GeV energy

March 27

  • Participants : Ashot, Chao, Dipangkar, Eugene, Krishna, Li,Mark, Mehdi
  • Minutes:
    1. Chao presented his booster results. The noise level on the pedestal with the new boosters is similar to the one observed before with the old booster. As for the simulation, more work is needed on the pile-up but it looks like that even a 10 μm diamond target is still too thick for our DAQ.
    2. Vacuum box:
      • Last Monday, they had a problem in the transportation from the painter to Meyer. The redid the painting with a Meyer person on site to help for the packing. It should have been shipped on Tuesday.
    3. Beamline
      • Bob sent some sketches but we need more for Rolf. Eugene will put everything together and will provide a list of things to be done on the beamline to Rolf.
    4. GEM: they are under assembly, they will probably be done by mid-end of April. Dipangkar and Krishna will go to UVA to test the electronics and their DAQ.
  • Talk
    1. File:Boosters and Simulation update.pdf by Chao (8 pages)

March 20

  • Participants : Ashot, Chao, Dipangkar, Eugene, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Accelerator:
      • It is not performing well,the hall is still open. They have a LCW problem and beam losses in the machine. Once this is fixed they will focus on hallA.
    2. Vacuum box
      • the tank was picked up from the vendor, they will inspect it today and packed it to ship it next week.
      • the analysis of the vacuum box has been forwarded to Rolf. As for the window, Bob does not have time to work on it before the summer.
    3. Booster
      • Booster were installed and tested with cosmics and LMS. It appears to have more noise on the crystal part than on the lead glass part. Chao will check the pedestal with HV and booster on to compare with previous pedestal data taken with old booster.

March 13

  • Participants : Ashot, Chao, Dipangkar, Eugene, Krishna, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Hardware:
      • Vacuum box: Meyer did all the test successfully and they will send the vessels to subcontractor for sandblasting and painting. THe box will be stored in the physics storage building once it is delivered to JLab.
      • Pumps: No news from Pfeiffer regarding the pump. Pfeiffer can sell the same pump at the same price as before (~49k$).
      • Ashot got the money for the computer and Chao sent the computer specs to him to place the order.
      • Booster: the lead glass part is rewired, the crystal part will be done next week (Tuesday and Wednesday during the downtime)
    2. Accelerator: they are having difficulties with the machine, so there is no beam to any hall. From the few hours of beam received, it seems that there is no large halo tail. The beam was sent to the tagger dump.
    3. Software:
      • Chao will do a simulation for solid target: 1nA beam on 10μm target diamond with electromagnetic and hadronic processes turned on.

March 6

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Krishna, Li, Mehdi, Zhihong
  • Minutes:
    1. Hardware
      • Ashot is going through budget revision for the new DAQ computer.
      • The TDC will be delivered next week
      • Vacuum box might be shipped next week. Rolf would like to see what would happen in case of catastrophic failure. Bob will provide all his calculations and drawings. If this not enough we may need to do a failure test.
      • MAC addresses of the power supplies have been given to Sergei

February 28

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Krishna, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Meeting with management outcome:
      • No place for PRad in 2015
      • Need to continue to develop the beamline and Rolf will try to look for engineering help outside HallB
      • They recognized that the target was in very good shape, Rolf will talk to the target group
      • We will need to submit the remaining tasks list to Rolf
      • There is no promise but we have a chance to run in Spring 2016, but given the funding situation the accelerator will run for an estimated 10 weeks period. The schedule will be released by March 1st.
      • We may need to provide results for a test of destruction of the window. Dave Meekins will do the calculations and we need to provide the procedure of the hydro-forming. If we really need to test for destruction we may need to buy more material in order to have all the windows from the same batch or as suggested by Chris just measure the Young's modulus of the two samples and compare them.
      • Readiness review: will probably have two reviews. One for showing that we have all the pieces built and tested (GEM, beamline and target) and another one for safety with all the required documentation.
    2. GEM
      • The frames have been delivered to UVA.
    3. Vacuum box
      • They had delays. Will ship it maybe next week
    4. Target
      • James is working on stiffening the support
    5. Other hardware
      • Ashot is working on ordering a new computer
      • The TDC has been ordered, will receive it in couple of weeks.
      • The booster power supplies are at JLab, need to hook them up and test them one by one, give the MAC, IP and names to Sergei


February 20

  • Participants : Ashot, Chao, Dipangkar, Eugene, Haiyan, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. PRad document for meeting with management
      • Vacuum box is expected by February 28th.
      • Beamline: Need 4-6 weeks for engineering and 4 weeks for procurement
      • Ashot and Dipangkar will make few slides
    2. Hardware:
      • Sergei provided the discriminators, we need to test them
      • Dipangkar got the quote for the 128 channels TDC: ~6k
      • The power supplies are shipped
      • Sergei is working on the VME crate to assign IP addresses
  • Talk
    1. File:PRad Status report.pdf by Dipangkar (2 pages)

February 13

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Target
      • Mailed to NH, but will be shipped to Germany
      • Chris will send the remaining task for the PRad status report and meeting with management
    2. PRad Status report
      • Need to include a timeline for the installation
      • Pictures of the target, vacuum system, vacuum box, GEM and HYCal cosmic ray
      • Get an estimate of the remaining fund needed from JLab
      • Hardware
      • Order DAQ computer, move Labview to Chao's computer which becomes the computer for the temperature sensor
      • Sergei will provide the VME discriminators
    3. Software
      • Chao is working on the Gain equalizer and how to talk to the DAQ
      • Need to check if 4.4 GeV is a viable energy for PRad (rate and time)

February 6

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Krishna, Li, Mahbub, Mark, Mehdi,Nilanga, Zhihong
  • Minutes:
    1. Beam Scehdule
      • PRad will not run in 2015, the situation is uncertain for 2016. (see schedule sent by Mont)
      • Spokespersons will have a meeting on Feb. 24th to discuss about the situation. On our side, we will need to prepare a list of the things we would want from the lab, of the statuses of the different items and the timeline for completion.
    2. Readiness review
      • The stopper is the beamline. Eugene met with Bob and FX. The estimated engineering time is about 4-6 weeks and an additional 4 weeks for the cart procurement. JLab does not have time so far to spend on this subject. CLAS12 and the 12 GeV upgrade has the absolute priority.
    3. Target
      • Chris will provide a list of the remaining task for the target. It is essentially in very good shape. The biggest issue is the 3D positionner. They need to design a better clamp.
      • the tritium experiemnt has been delayed by one year so Chris has more time to spend on our target.
      • There are enough power and outlets in the Hall to run the pumps and chiller. We just need to make new cables
    4. GEM
      • The overall delay is about one month due to delays on the frames, electronics at the customs and bad readout boards.
      • We should have a chamber built and tested by April.
      • Nilanga will provide pictures of the progress for the Feb. 24th meeting
    5. Software
      • Chao and Li are making progess on theGain equalizer, Calibration and Online monitoring codes
    6. Hardware
      • Chao will check with Sergei about the discriminator
      • Ashot will by a new powerful DAQ computer
      • Dipangkar will look into a new computer for the temperature controllers and will install the new Labview on it.

January 30

  • Participants : Ashot, Chao, Dipangkar, Eugene, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Target
      • The 3400 MC pump will be shipped today to Pfeiffer in New Hampshire for evaluation to see if it can be repaired in NH or needs to be shipped to Germany.
      • Mehdi took the pictures of the pump to chamber and chamber to stand connections and sent them to Pfeiffer to get new additional screens (at no charge).
    2. Box/Window
      • Delivery estimation is end of February or earlier.
      • Weekly updates have been requested and there is no show stopper for the rest of the project.
      • Window has been delivered on Monday to Meyer Tools.
    3. Beamline
      • no update from Bob as he was busy. The design and analysis of the beamline is estimated to take 4 weeks of engineering work.
      • The latest and final step file of the vacuum box has be receive, the ETA for the stand is about 3 weeks.
    4. GEM
    5. Frame has been shipped and the new readout board are being made. In two weeks Nilanga and Kondo will know is the board will be on time.
    6. Timeline: 2weeks for assembly and 1 week for testing. So we should be able to get one chamber ready by early March.
    7. Another option is to make a chamber with the readout boards with flaws and test it for the review. Then reopen it to change the boards. We should consider the option as a last resort since it will be time consuming for Kondo and Nilanga.
    8. Software
      • Chao and Li are working on theGain equalizer, Calibration and Online monitoring codes
    9. Checklist
      • Dipangkar will buy a labview license for the temperature controllers and Ashot the DAQ computer.

January 23

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Josh, Krishna, Li, Mahbub, Mehdi, Nilanga, Zhihong
  • Minutes:
    1. Target
      • Assembly of the gas handling system, cold head, vacuum system (3400 pumps and cell). No automated motion yet.
      • One of the 3400 had a problem. Chris will ship it back next week to Pfeiffer
      • Josh perform a test with only on 3400 running on the target chamber with He at 23K, no secondary chamber connected. He reached the density in the proposal. It exists a factor of 60 between the pressure in the center of the cell and pressure in the chamber with only one pump. So having the second one running will improve the situation.
      • The main message is that it is possible to run with only one pump and certainly with two.
    2. GEM:
      • Nilanga expects the shipment of the frame today and get it by next week.
      • The read out board had so problem and he will get new ones by mid-February
      • The plan is to start building the GEM on February 1st and get it assembled by end of February, tested in early March if there is no further delay.
      • Will receive the electronic by next week (time to get them clear at the customs)
      • Once we know more about the timing of all the GEM pieces we will be able to talk to Patricia about the date of the review.
    3. Accelerator and Hall B:
      • 12 GeV project has absolute priority
      • Hall B will have a staff meeting this afternoon to discuss about reorganization of manpower and milestone to reach. Bob became chief engineer and Dave is fully involved in the CLAS magnet. They might decide to work on shift for the installation of the torus which means no beam at all in the hall (HPS and PRad will get no beam)
    4. Beamline
      • We will provide a sketch of the beamline and Bob will tell us how much engineering time it requires to complete the design and installation/construction so that we can give this info at the review.
      • From Li's simulation (see slides below), the current design of the window-pipe connection does not cause any background problem.
    5. Vacuum Box
      • The window is being shippe dto Meyer. Meyer recieved the new sheet for the box and will start to machine and weld it for the new box. We need to wait next week for a delivery estimate
    6. MRI
      • We need to make a list of all the different items (DAQ, Labview?, Pump??, power supply?) that remain to be bought in order to spend the remaining MRI funds.

January 16

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Josh, Krishna, Li, Mehdi, Nilanga, Zhihong
  • Minutes:
    1. Readiness Review:
      • Patricia: have the review early March because of the CLAS collaboration late February in Europe.
      • GEM: Need to have a chamber built and tested prior the review. There are few delays from CERN, Nilanga is waiting for next week to give an estimation of the completion of one chamber. Kondo is at CERN and will bring back electronic for the GEM
      • Target: Need to provide all the documentation at the review. Dave Meekins acts as the design authority and will ask another lab to review the design of the target. This should be done by early March.
      • Beamline: Will need a layout and design of it. Bob made a conceptual design of the window-pipe connection (see below). We will to provide background simulation with this new attachment piece. Li will take care of it.
    2. Window: Eugene is working on the shipping of the window for the pressure and vacuum test at Meyer's lab. Meyer had problems with the box. They need to redo it, this implies 1-2 weeks delay in the delivery.
    3. HyCal:
      • Need to work of EPICS script for a remote control of HyCal. Need to plan for an emergency stop in the counting room.
      • Need to order new booster supply with EPICS drivers (CAEN or WEINER). Dipangkar will take care of it.
    4. Accelerator schedule (so far)
      • Will run in early November. Accelerator has to show 12 GeV which means only 2.2 GeV is possible.
      • Only hall A and D are scheduled for physics if the accelerator provides 12 GeV beam.

January 9

  • Participants : Ashot, Chao, Chris, Dipangkar, Eugene, Josh, Krishna, Li, Mehdi, Zhihong
  • Minutes:
    1. Accelerator: down until Mid February, physics beam will start early March
    2. Budget is not the one expected, as a consequence the accelerator will run until May 4th. The TBD slots for PRad have been trimmed off.
      • HPS will run in March and May
      • PRad will run in the Fall, have a very slim chance to run in the Spring if anything goes wrong in HPS
    3. Readiness Review will be scheduled for the first half of February. Eugene is going to talk with Patricia. All the major piece of equipment will be ready for the review except GEM which are under production.
      • Target:
        1. Has been push down to the lowest priority on the target group list behind the Hall A and D cryo-targets and the Hall A tritium target. We should not expect much work done from the target group prior the review. As for now, the chambers are connected and on the target stands, all the pumps are on and running. We will be able to show a version, which will not be the final one, at the review with pumps and cold head on flowing with Helium.
        2. The major item left is the safety documents. Dave Meekins will need to review on perform calculations but he is very busy right now.
      • Vacuum box:
        1. Try to form the window yesterday but they had problem with the tooling that bended but this should be fix in the next day or two.
        2. The plan is to send it for a test to Meyer Tool in Illinois: they will do a pressure test with a blank and a vacuum test with the window. Everything should be done (shipping, test and shipping back to JLab) by the end a January.
        3. We received all the calculation performed by Meyer and George already reviewed them.
      • Beamline Design:
        1. Conceptual for the vacuum box stand is ready
        2. Need to assign a designer for the whole beamline and connection between the window and the pipe.
        3. Dipangkar will work on providing all the beamline elements (starting from the tagger up to behind HyCal) and their location to the beamline designer.
      • GEM
        1. Need to provide the status for the review but this should not be a show stopper.
      • HyCal
        1. It is essentially ready, can see clear cosmic tracks (See Chao's slides below)
      • Tasks
        1. Need to work on the software part for online monitoring, DAQ, calibration, basically the whole Primex package.
        2. Need to work on the paperwork for the review.
  • Talk
    1. File:Cosmic Data on HyCal.pdf by Chao (7 pages)


    1. To everybody: Need to document any PRad related tasks and changes (hardware and software) in the logbook
    2. Box/Window:
      • Material for the window is out in the machine shop to be cut
      • The clamping ring will be done at the machine shop (3x cheaper than any bids)
    3. HyCal:
      • Wednesday at 1PM was the first access to take cosmics, but the event builder crashed after few hours. Chao is looking into this.
    4. Target: Josh talked to Dave Meekins and they should not need any external engineering help.
    5. Power supply is at MSU, will be brought to JLab when Dipangkar will start his sabbatical leave.

2014

December 12

  • Participants : Chao, Eugene, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. To everybody: Need to document any PRad related tasks and changes (hardware and software) in the logbook
    2. Box/Window:
      • Material for the window is out in the machine shop to be cut
      • The clamping ring will be done at the machine shop (3x cheaper than any bids)
    3. HyCal:
      • Wednesday at 1PM was the first access to take cosmics, but the event builder crashed after few hours. Chao is looking into this.
    4. Target: Josh talked to Dave Meekins and they should not need any external engineering help.
    5. Power supply is at MSU, will be brought to JLab when Dipangkar will start his sabbatical leave.

December 5

  • Participants : Ashot, Chao, Eugene, Haiyan, Josh, Krishna, Li, Mahbub, Mehdi, Nilanga, Zhihong
  • Minutes:
    1. HyCal Test: Need better cosmic statistics (~1 day) to see if there is any hot channels and to get the occupancy plot. Need to lower the threshold by half, install booster and check the interlock.
    2. Readiness Review Preparation:
      • Timeline: 2nd part of January or early February. There will be no beam in Hall B before the end of February. So we need to pass the review before the end of February to be able to ask for beam time. We need to contact Patricia ahead of time in order to form a committee
      • GEM:
        1. Jan 10th - 15th get everything (frame and foil) and start the assembly
        2. There is no real issue to build the chamber, just need to incorporate the GEM electronics into CODA. Krishna is working on it. (JLab will not provide help)
        3. By the end of January (account for possible delays) one chamber should be done. We can show pics of the frame, foil and chamber for the review.
      • Target:
        1. Target group schedule priority is Hall A -> Hall D -> PRad: for the review, there will be a version of the target running on Helium with no automation.
        2. Stand has been delivered, the engineering part of the target will be done by Dave Meekins. Given his schedule, this will not be achieved by the end of January.
      • Vacuum Box:
        1. Due date is January 8th
        2. Meyer's drawings have been reviewed by JLab, new calculations are needed for safety. Once the design is fixed, the work on the stand design will start.
        3. Bob and Denny will work on the window in a week or two. 1st make a window with no hole, send it to Meyer for a test, and make the hole once it is sent back to JLab.
        4. Bob will assign someone for the beamline design which includes the window hole, attachment piece and pipe.
      • Paperwork:
        1. Eugene is taking care of it.
  • Talk
    1. File:Cosmic data.pdf by Chao (7 pages)

November 21

  • Participants :Ashot, Chao, Dipangkar, Eugene, Haiyan, Josh, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Dynode problem (see slides below), may come from a capacitor problem (discharge) or a ground problem. Need to set the threshold higher.
    2. Meyers will send the final drawings today or next week. So that we will be able to start the design of the vacuum box stand.
    3. Most of the items for the target stand are out of the machine shop.
    4. We may need/want to order a spare HV module.
    5. Eugene will wok on the documentation for the readiness review.
  • Talk
    1. File:Trigger for cosmic.pdf by Chao (3 pages)

November 14

November 7

  • Participants : Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Mehdi,
  • Minutes:
    1. Hall will be closed from 3 pm on Friday to next Monday in the morning.
    2. Chao and Li are taking the evening shifts (3 pm to 11 pm) and night shifts (11 pm to 7 am next day) on November 7 (Friday), 9, 10, 11 (Tuesday).
    3. Josh will come up with a list of what to buy for the target.
    4. SRS data-taking: responds to the external trigger now, still working on the configuration.
    1. Target Design:
      Target.png
      by Josh (1 page)


October 31

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Target:
      • Cell and top plate will be out for the machine shop next week
      • Buyer assigned into the system for the target stand, PR out next week
      • Gas handling system is being put together
    2. HyCal
      • all the channels are fixed but one
      • Next is to set logics for the dynode signal and take cosmics.
      • Need to buy one HV module: get quote from CAEN +lead time
      • we do NOT have spare dividers but we DO have 52 PMT tubes if needed
      • see where we can borrow a power supply for the LMS
      • need to find LEMO to NIM connectors
      • need to put event display back to life
  • Talk
    1. File:Updated list.pdf by Chao, Li, Mehdi (7 pages)
    2. File:Collimator Simulation.pdf by Chao (8 pages)

October 24

  • Participants: Ashot, Chao, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Hall B is preparing beam line and asking for schedule about the work of HyCal
    2. Ashot will come on next Thursday, and the students need to minimize the bad channels before he comes
  • Talk
    1. File:LMS signal.pdf by Chao (5 pages)

October 17

  • Participants: Ashot, Chao, Dipangkar, Eugene, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. The anode and dynode signal tests are done. We proceed channel by channel. We repaired the channel with weak anode signal: change fiber and/or optical connector, re-glue. We either see no change in the signal or a significant improvement.
    2. HyCal will need to be lifted by the end of the week.
    3. Cards are connected to the ADC boards.
    4. Meyer Tools is the company that will build the vacuum box: delivery is expected by the end of January or earlier.
    5. NSU staff forgot our order for the GEM frame. Mahbub will see to push them if order to get the PO out in few days.

October 10

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. The HyCal central hole is conical: we measured a 1.4" OD and asked the machine shop for a 1.4"OD tube. It fits wells with just enough clearance.
    2. PO for GEM form NSU should be out next week.
    3. Start testing the anode signal channel by channel. It should be done on Monday.
    4. PRad is not on the beam time schedule because we did not pass a readiness review. We need to show that the vacuum box is ordered and will be delivered by the end of the year, that HyCal is fully operational and that the GEM order is under control.
  • Talk
    1. File:Status of HyCal.pdf by Chao (5 pages)

October 3

  • Participants: Chao, Dipangkar, Eugene, Josh, Krishna,Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. The gate valve has been delivered
    2. Mahbub: purchase order for the GEM frame should be out next week
    3. Vacuum box: all drawings have been signed by JLab, the bids will be sent out next week. (with requirement to delivered the box by the end of the year)
    4. Thin Window: Denny will collect the tools and other equipment for the test.
    5. Accelerator: No commissioning beam until early November
  • Talk
    1. File:Solid target simulation2.pdf by Chao (7 pages)

September 25

  • Participants: Ashot, Chao, Eugene, Josh, Krishna, Mehdi, Zhihong
  • Minutes:
    1. Vacuum Box:
      • Procurement will send out bids to a list of selected vendors (small businesses since order is less than $150k). They are asked to send quotations within two weeks and the package includes requirement to deliver by the end of the year.
      • Al sheets have been delivered on Thursday 24th, will talk to Bob to proceed with the test
    2. Josh will look into possible solid targets based on Chao's simulation results.
    3. HyCal is down however no work can be done until Krister or Denny work on the interlocks.
  • Talk
    1. File:Solid target simulation.pdf by Chao (6 pages)

September 19

  • Participants: Ashot, Chao, Dipangkar, Eugene, Josh, Krishna, Li, Mehdi, Zhihong
  • Minutes:
    1. Vacuum Box: Bob should send his comments about the design today.
    2. Al sheets were shipped today, should receive them next week.
    3. Beamline work in the hall continues, Krister did not have time spend on the interlocks and he is out of town next week. Eugene asked him schematics and will talk to Denny to restore the interlocks.
    4. Scaffolding: Ashot will write the request (details about the work, persons involved and the reasons why we need a scaffolding) and address it to Doug. People on the scaffolding will need to take the Full Protection and Harness trainings.
    5. Josh started to design the target, will need info about the type and thickness of solid target. Chao will run a quick simulation to determine the possible thickness.
    6. Chao: solve temporarily the EndEvent problem (until we receive new CPU) and concentrates on the online software. Mehdi and Chao will update the database.

September 12

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Josh, Krishna, Li, Mehdi, Zhihong
  • Minutes:
    1. Eugene: Bob and George will review the design within this week. The PR of vacuum box is in the system, needs approval, the cost estimate is based on the previous quote plus a bit more. As soon as the contract is issued for the vacuum box, HallB engineers will start working on the stand.
    2. Bob will look into the fixture to make the hole in the Al sheets which were not recieved yet.
    3. Hall B: several power outage this week, will have clean power next week but still not network power. Clean power will be down on the 22nd for about a week. HyCal work will most likely ne shifted to October.
    4. Bob will look into the scaffolding option to work on HyCal.
    5. Mahbub: order of the GEM frame is slow on the NSU part. Will talk to Nilanga to speed up the process.
    6. Chao: added 2 crates so that the TI can control all of them.
    7. Krishna, Alex Camsonne: installed coda and had network issue for the GEM DAQ.

September 5

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Josh, Krishna, Li, Mehdi, Zhihong
  • Minutes:
    1. Eugene:
      • Utility is back, but Krister will not be available and Denny is out. Will need to see if Krister can work on the interlocks next week.
      • Monday: clean power will be off. By Sep 15th it will be off for one week.
      • Bob and Paul will work on the pipe/window connection.
    2. Mehdi: sent the drawings to Bob, George and Dave for review before new quotations
    3. Chao: firmware update for TI, will add the remaining crates.
    4. Access to HyCal is still a problem, beamline setup has the priority since they need to provide accelerator quality beam by Oct 15th
    5. GEM: estimate for the frame was much larger: Duke has just enough to buy one (order placed), NSU is buying the second one.

August 29

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Josh, Krishna, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Haiyan: GEM frame order is placed. Everything is on schedule on the GEM side.
    2. Dipangkar: Will order the Al sheets for the thin window today.
    3. Eugene:
      • Existing fixture for the thin window will work for us with a 0.063" thick sheet. The window will be built at JLab. Bob is thinking about the hole in the middle to accommodate the pipe
      • Anatoly is currently working with Vitaly and as soon as we have power, he will working with us.
      • Survey had been made in the hall, Bob is waiting for the final number to complete his design of the target stand.
    4. Will get the updated drawing of the vacuum box from Gary: decided to go with a larger flange and keep the diameter of the second vessel unchanged.
    5. Need to get the document of operating procedure for the readiness review: Target from Josh, Tank from George + Calculation from engineers.
  • Talk
    1. File:DAQ0828.pdf by Chao (5 pages)

August 22

  • Participants: Ashot, Chao, Dipangkar, Eugene, Gary, Haiyan, Josh, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Chiller: Utility power is shut down, will come back in early September.
    2. High Voltage: All crates are connected to the network and are ready to use after chiller and interlock are operating.
    3. DAQ: Trigger Interface master successfully working in a Fastbus crate.
    4. Vacuum Box: An engineer (probably) from Hall C will help check the calculation related to the vacuum box window in next week.

August 15

  • Participants: Ashot, Chao, Eugene, Josh, Mahbub, Mehdi
  • Minutes:
    1. Chiller: Interlocks need work, Krister will be available next week.
    2. High Voltage: We have borrowed two high voltage crates from Fast Electronics Group and Hall B. These two crates successfully booted and could be controlled by the HV software. Several random channels were tested and correct feedback were obtained. The high voltage crates are ready to use. (The crate from Hall B does not have a universal interlock input, the interlock signal will be distributed to each module on that crate)
    3. DAQ: The left crate was fixed thanks to Chris and Mark. Now 3 crates work well with the SFI AUX card.
    4. Beamline: cabling (signal and HV) has been completed today Friday.
    5. Vacuum Box, thin window: Bob Michael performed his own calculations with 0.063" thick window and sent his spreadsheet to Dave Kashy. We have yet to hear from him. Eugene will talk to Rolf on Monday about engineering help.

August 8

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Josh, Kondo, Mahbub, Mehdi, Weizhi, Xuefei, Zhihong
  • Minutes:
    1. Chiller: interlocks need work, Krister will be contacted and the hoze on HyCal will be hook up today.
    2. Doug will close HyCal and will find a 1.5" OD tube to go through to test the central hole.
    3. Vacuum Box/Thin window: only available sheets are 80"x80" and 0.063" thick. Will wait on Dave Kashy answer to see if we can use this thickness. Otherwise we will need to go with a square window.
  • Talks:
    1. File:DAQ 0808.pdf by Chao (7 pages)

August 1

  • Participants: Chao, Eugene, Josh, Kondo, Kris, Mahbub, Mikhail, Weizhi, Xuefei, Zhihong
  • Minutes:
    1. HyCal work: Need to measure the real size of the central hole next week. This information is also needed to finalize the design of GEM.
    2. Chiller: Leakages are fixed, will test the chiller next week
    3. Vacuum Box: Hall C is using a similar window (72 inches round shape), will communicate with them to see if we can get the material from the same vendor. So it is possible to go through our original design of the vacuum box window.
  • Talks:
    1. File:GEM Design.pdf by Kondo (7 pages)
  • Update after the meeting:
    1. High Voltage: CPU box of the bad crates are uninstalled and placed on a table on the 0th floor, An expert named Robert is supposed to survey them


July 25

  • Participants: Chao, Dipangkar, Eugene, Josh, Kris, Li, Mahbub, Mehdi, Mikhail, Weizhi, Xuefei, Zhihong
  • Minutes:
    1. HyCal work: see Li's slides below. Work needs to be done on interlocks and cables between counting house and hall. Need to think about extra conductors for the target
    2. Josh: Chris is able to talk to all the motors of the positioner through a LabView interface.
    3. Eugene:
      • Ordered two 2024 T3 Clad Al sheets: 0.025" and 0.032" thick (48 feet x120 feet).
      • Design of the target stand is almost done.
      • Mahbub: Beam Scheduling Request has been sent to Volker for review and will need approval from Chris Keith, Graham and Radcon.
    4. Mehdi: Will have meeting with Dave K., Bob M., Eugene and Gary on Monday to decide for the design of the thin window and vacuum box flange.
  • Talks:
    1. File:HyCal work.pdf by Li (8 pages)

July 18

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Kondo, Josh, Li, Mahbub, Mehdi, Weizhi, Xuefei, Zhihong
  • Minutes:
    1. HyCal Work:
      • Transporter works fine. HyCal is up and all the cables on top have been successfully connected.
      • Thin Window: Mehdi/Dave, max size of Al sheet is 4 feet x 12 sheet. Too small for the ~5 feet diameter window. George Bialas knows Butch Dillon Townes who could make larger windows. Need to wait before redoing the design (square window) of the vacuum box.
    2. Mehdi: vacuum box is ~$80k. Will ask companies for large blanks.
    3. All: need to think about procedure to install and protect the thin window.
  • Talks:
    1. File:DAQ update.pdf by Chao (5 pages)

July 10

  • Participants: Ashot, Chao, Dipangkar, Eugene, Haiyan, Josh, Li, Mahbub, Mehdi, Weizhi, Xuefei, Zhihong
  • Minutes:
    1. HyCal Work:
      • Need to check HV+signal cables. All UVA module channels have been checked one by one. Only one bad channel (26 on module W22), the modules has been replaced and works fine.
      • Doug will to a pressure test of the water cooling system.
      • First attempt to talk to the transporter failed
    2. Eugene/Bob: Design of the target stand will take 2-4 weeks before procurement. Expect to have it within 10 weeks.
    3. Haiyan: Workshop at Mainz about charge radius was very interesting. People are very interested in the outcome of PRad. Preliminary results from PSI shows Muonic and electron Helium4 Lamb shift measurements agree with each other. MUSE will need few more years to be ready.
  • Talks:
    1. DAQ_update.pdf by Chao (7 pages)

June 27

  • Participants: Ashot, Chao, Eugene, Haiyan, Josh, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Eugene:
      • HyCal is in the Hall, the mechanical parts of the transporter are installed, the electrical parts will be installed soon. Cabling and setting up environment for EPICS variables is work in progress.
      • HyCal chiller is in place and eventually will be controlled by EPICS.
      • Work on the beamline will require some sporadic help.
    2. Ashot: will send the scope of work to Doug after the meeting so that work in the hall can start on Monday
    3. Mehdi:
      • received a quote for the updated design of the vacuum box from Meyer. Need to wait for Pfeiffer to take a decision.
      • will talk to Hall B engineer/technician to setup the window test.
    4. Haiyan: DOE supplemental proposal has been funded for the GEM project.
  • Talks:
    1. beamline.pdf by Eugene (2 pages)

June 20

  • Participants: Ashot, Chao, Eugene, Li, Mahbub, Mehdi, Xuefei, Zhihong
  • Minutes:
    1. Chao: DAQ work in HallB is on going (mainly cleaning)
    2. Mehdi: Will get the quote for vacuum box only. The stands can be design later and build by a local vendor. Boxes are more time sensitive so we need to place the order as soon as possible
    3. Mehdi: will talk to Dave for the window test (need estimation of the material, cost and manpower)
  • Talks:
    1. Collimators.pdf by Chao (6 pages)

June 13

  • Participants: Ashot, Chao, Kondo, Dipangkar, Eugene, Josh, Li, Nilanga, Mahbub, Mehdi
  • Minutes:
    1. Kondo: will have a final design after his visist to CERN in September, need to count 3-6 month after that to build the detector. (See talk below)
    2. Eugene: HyCal will be move to the Hall on Thursday June 19th. First task will be to open it and proceed to a visual inspection of the optical connections and light monitoring system and test them. By mid July, HyCal will be installed on the transporter

June 6

  • Participants: Ashot, Chao, Kondo, Dipangkar, Eugene, Li, Nilanga, Mahbub, Mehdi
  • Minutes:
    1. Ashot has a set of 30 ADC we can use.
    2. Mahbub is going to ask for an extension of the MRI.
    3. Dipangkar will have a postdoc 100% at JLab to work on PRad.
    4. Nilanga: Condo is in charge of the design of the GEM, will present an update next week.
    5. Eugene: Need to decide the beamline configuration. According to Arne at the Users Meeting, the beam and the machine is and will not be perfect for the commissioning (expect 20 beam trips/hour ). So it is important to have harp to measure the beam spot and halo. We have option on where to put them.
      • Keep the one upstream from the tagger magnet
      • HPS will put one in the alcove.
      • we can use the 3rd harp from the goniometer and put just upstream of the target system. This is for us the best option.
  • Talks:
    1. thin_window.pdf by Gary (5 pages)
    2. simulation_DAQ.pdf by Chao (8 pages)

May 30

  • Participants: Alexander, Ashot, Chao, Eugene, Francois-Xavier, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Bob Miller will work on the target chambers stand.
    2. Gary/Mehdi: Finalizing the design of the box (see talks), work on the stand and get a more accurate quote from vendors.
    3. Li will produce the r vs z background plot: include the vertex info to see if the background mainly come from the flange or the pipe.
    4. Chao will work on the collimator simulation.


May 9

  • Participants: Ashot, Chao, Dipangkar, Eugene, Francois-Xavier, Haiyan, Josh, Li, Mahbub, Zhihong
  • Minutes:
    1. Based on Li's simulation, the flange will introduce about 2% background to the first angular bin (0.8 - 1.05 degree). This background rate is low, thus it may be rejected by tracking. It will be verified by further simulation study. (The dimensions of the flange in the code may be changed according to the real design.)
    2. Zhihong obtained the fiber samples, he is waiting for the tools for cutting and polishing.
    3. Target chamber: lack of blank flanges and bellows in the delivery. The order and shipment information needs to be checked.
    4. GEM: the order can be placed quickly. Nilanga will attend the collaboration meeting.
    5. Move of HyCal: The work will start in June. Students need to make sure the trainings are up-to-date.

May 2

  • Participants: Alexander, Ashot, Chao, Dipangkar, Eugene, Francois-Xavier, Haiyan, Josh, Li, Mahbub, Mehdi, Sergei, Zhihong
  • Minutes:
    1. Chao will implement the 1mm iron HyCal window into his simulation
    2. Sergei:
      • Start moving HyCal May 28th (on transporter or cart? Cart would be a good idea so that we can start testing it but this could interfere with work in the hall), July 9th testing
      • electronics: The old fastbus have long cables and 34 pin connectors. For Flash ADC, we will need to replace the connector by LEMO connectors (total of ~$30k), the lead time is few month so we need to order them asap. The ADC are right now used by HPS. Need to ask Volker to use the CLAS ADC.
      • DAQ: be operational in August or September at the latest.
    3. Position detector: timing will probably be to tight for the SciFi traker and too expensive. Will continue with the prototype. GEM is our main option for tracking. Dipangkar will follow up with Nilanga.
  • Talks:
    1. Q2 resolution by Ashot (9 pages)
    2. Thin Window and Vacuum Box by Gary (5 pages)
    3. Back Scattering in GEM or SFT by Chao (10 pages)
    4. Tracking by Chao (8 pages)
    5. SciFi Tracker Status by Zhihong (16 pages)
    6. Tracking by Li (4 pages)

April 25

  • Participants: Alexander, Ashot, Chao, Dipangkar, Eugene, Francois-Xavier, Haiyan, Josh, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Eugene Pasyuk joined the PRad collaboration
    2. Mahbub: Chambers will be done and shipper next week. Estimated delivery at JLab: May 7th-8th. This may change due to customs potential delays.
    3. Haiyan will send to Volker and all relevant persons the drawings of the vacuum box for a design review.
    4. Based on Chao and Li simulations, a tube connected to the vacuum box and going through HyCal is the best option for background purposes.
    5. Next collaboration meeting Friday May 23rd.
  • Talks:
    1. Updated design of the vacuum box by Gary (4 pages)
    2. Vacuum Box window simulation by Chao (7 pages)
    3. Vacuum box tube and flange simulation by Li (8 pages)
    4. New event generators for the PRad experiment by Alexander (10 pages)

April 18

  • Participants: Alexander, Ashot, Chao, Dipangkar, Gary, Haiyan, Josh, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Josh/Gary: Will need a gate valve upstream of the target chamber. HallB should have one that we can use. Gary will check carefully if we can find a large enough sheet for the vacuum box window. He will focus on the box and the flange. He will proceed by iterations with Jlab to check the design.
    2. Josh:
      • We need to provide him with the stand for the chambers so that he does not need to build a temporary one for the test. Ashot: HallB will build the stands.
      • Give him the cell size we would like. Possibility of having different cell size but the surver will no longer be valid after a swap or cells.
      • Need to give him the clearance between the cell and heavy materials.
      • Need to give him the number and type of solid target. Ashot is working on that.
    3. Haiyan will follow up with Rolf and Volker about the procurement and design review of the vacuum box.
    4. Chao: will do a simulation, just for checking, of a 25mm diameter cell, 4mm diameter opening and 3mm thick copper tube.

April 11

  • Participants: Alexander, Ashot, Chao, Dipangkar, Francois-Xavier, Haiyan, Josh, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Ashot: Talked to Volker, good chance we could start moving HyCal to the hall 2-3 weeks earlier than planned. Will be difficult to get a russian calorimeter expert to come to Jlab due to DOE new rule. Maybe invite him through a University.
    2. Haiyan: talked to Rolf, HallC or D engineers will help to review and advise the vacuum box design. Timeline: get the design reviewed by June and start the procurement by July.
    3. Ashot, Mahbub: will work on the extension of the MRI funds.
    4. Zhihong, Chao will setup the DAQ and start the fiber test next week. Mahbub will ask Bogdan to borrow electronics and PMT.
    5. FX: Bob Miller agreed to work on the stand of the vacuum box given he has a preliminary design of the box
    6. Mehdi: vacuum box design: target cell center is at 550cm from HyCal surface. 20cm gap for tracking detector between the vacuum box window and HyCal -> 530cm between the target center and the vacuum box window.
    7. Li will pursue his effort on vaccum box window and pipe simulation with more statistic, will add collimator.
    8. Chao is working on updating the simulation will a new beam halo parameter.

April 4

  • Participants: Alexander, Chao, Chris, Dipangkar, Francois-Xavier, Josh, Li, Mahbub, Mehdi, Zhihong
  • Minutes:
    1. Josh:
      • Need to define empty target run: either good vacuum in the cell and chamber or same pressure in cell as in the target chamber (when hydrogen is flowing).
      • Need to define the type and number of solid targets. One solid target would be the easiest configuation.
      • Can we make the target cell diameter bigger? This would help the pressure inside the cell. Main unknown: the beam halo extension. FX is checking with Arne for a conservative and realistic estimate.
      • How far away from the cell can be accept heavy material? Answer will depend again on the beam halo.
      • Need to provide design and support structure for the pumps and chambers. Mehdi will ask Gary Swift if he can help.
    2. All: Need to provide Josh answers within two weeks.
    3. Mehdi: Will ask Huntington for the software of the 3D positioner.
    4. Zhihong: Will talk to Carlos Ayerbe about DAQ availability.

March 28

  • Participants: Alexander, Ashot, Chao, Dipangkar, Francois-Xavier, Li, Mehdi and Zhihong
  • Minutes:
    1. Li: (See slide below) From his study, GEM generate low background. Also vacuum box with a pipe that runs through HyCal is a better solution than a single thin window. Need confirmation of this result with Moller events. Simulation is ongoing.
    2. Ashot presented a plot of Q2 resolution vs angle with 100 μm beam spot, 2 mm Al window and vertex uniformly distributed along the z axis (4cm total). 0.3 mm resolution tracking detector would be desirable.
    3. Mehdi: Working with Gary Swift from TUNL on the vacuum box. Will work with Bob Michael to get his feedback on the design.

March 14

  • Participants: Alexander, Ashot, Chao, Dipangkar, Francois-Xavier, Li, Mahbub, Mehdi and Zhihong
  • Minutes:
    1. Zhihong: Almost ready to test the fibers (Power supplies, NIM crate, Fastbus, fibers and SiPMT are on site). Asked the Jlab machine shop to produce fiber/SiPM connectors. Looking for a black box (~2m long) for a light yield test. SiPM will be from HallB and different type of fiber form HallC. An cost estimate of the detector for PRad is ~$80k + overhead and without DAQ.
    2. Dipangkar will talk to the NorthWestern group about MaPMT (16 pixels) from D0, Ashot will ask Bogdan for DAQ and other items.
    3. Li: Fixed the bug in his code. Results are shown in the presentation below. He will redo the study with an energy deposit cut in HyCal and no angle cut, similar to a level 1 trigger.

March 7

  • Participants: Alexander, Ashot, Chao, Li, Mahbub, Mehdi and Zhihong
  • Minutes:
    1. Chao and Li picked up part of the 3D positionner at NSU. One box was to big to fit in their car. They will complete the job by Tuesday.
    2. Ashot: talked to Bob and Volker, PRad is on the same footing as HPS as long as we passed the March 21st internal review with JLab management. According to Arne, the beam quality should be OK for 1-2GeV.
    3. Chao will look into the background rates due to the collimator
    4. Li will cross check his results with Chao's code to understand why the rates get smaller when the vacuum box window gets thicker. May be due to statistic.

February 28

  • Minutes:
    1. Target Chambers: Mahbub and Mehdi sent the initialed drawings back to Pfeiffer. Construction will take ~8-10 weeks. Little issue with an extra $200 shipping cost. Will ask for a separate bill in order to avoid redoing a new order at NSU.
    2. Alignment System: Delivered Monday Feb. 24th. Vina will bring it to Jlab.
    3. Coordinate Detector: Zhihong has been award of an $11k JSA Postdoctoral Fellowship. Will be used towards a XY position detector prototype (scintillating fiber). He will give a talk at the next CLAS meeting on Monday March 3rd. Seems that this type of detector is the best option (no need to be as precise as GEM (see Chao's studies), the UVA group is already very busy with SuperBigBite and SoLID) however the cost needs to be evaluated. Zhihong will contact detector engineers at Jlab as wells as at Saint Gobain. Will need help from Jlab for the electronic.
    4. Ahsot, FX and Mahbub will work on the halo monitor.

February 21

February 14

February 7

January 31

January 24

January 17

Retrieved from "https://wiki.jlab.org/pcrewiki/index.php?title=PRad_Weekly_Meetings&oldid=924"