PRad Weekly Meetings

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

2014

April 11

• Participants: ...

• Minutes:
  1. ...
  2. ...

• Talks:
  1. Flange and tube simulation data, bin by bin check by Li Ye (8 pages)

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.

• Talks:
  1. Dead Areas on GEM by Chao Peng (12 pages)
  2. Update Simulation for Adding a Tube by Li Ye (16 pages)

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.

• Talks:
  1. Preliminary simulation for Scintillator Fiber Tracker (SFT) by Chao Peng (10 pages)
  2. GEM detector simulation by Li Ye (7 pages)
  3. Vacuum Box Design and Background Simulation by Li Ye (13 pages)
  4. A plot for the Q2 resolution vs theta by Ashot Gasparian (1 page)

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.

• Talks:
  1. Update background simulation for Vacuum box window by Li Ye (10 pages)

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.

• Talks:
  1. Background study with collimators by Chao Peng (10 pages)
  2. Background simulation for Vacuum box window by Li Ye (9 pages)

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

• Talks:
  1. Background study with collimators by Chao Peng (9 pages)

February 14

• Talks:
  1. Radius extraction 2 by Chao Peng (15 pages)
  2. He4 Bag Simulation by Li Ye (6 pages)
  3. On the possibility to reconstruct the event vertex by Alexander Gramolin (8 pages)

February 7

• Talks:
  1. Radius extraction by Chao Peng (9 pages)

January 31

• Talks:
  1. GEM Detector Simulation by Li Ye (7 pages)
  2. A simple study of the angular and Q² resolutions by Alexander Gramolin (5 pages)

January 24

• Talks:
  1. Q² resolution by Chao Peng (2 pages)

January 17

• Talks:
  1. Tracking and Q² resolution by Chao Peng (12 pages)