PRad Weekly Meetings

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PRad phone meetings are held every Friday at 11:00 am EST.

2014

November 13

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

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