Difference between revisions of "General Meeting Summary 4/16/20"
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(Created page with "PARTICIPANTS: V. Berdnikov, A. Camsonne, C. Munoz-Camacho, R. Ent, M. Fowler, T. Horn, C. Hyde, S. Lassiter, P. Medeiros, H. Mkrtchyan, J. Murphy, J. Roche, V. Tadevosyan, B....") |
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PARTICIPANTS: V. Berdnikov, A. Camsonne, C. Munoz-Camacho, R. Ent, M. Fowler, T. Horn, C. Hyde, S. Lassiter, P. Medeiros, H. Mkrtchyan, J. Murphy, J. Roche, V. Tadevosyan, B. Wojtsekhowski | PARTICIPANTS: V. Berdnikov, A. Camsonne, C. Munoz-Camacho, R. Ent, M. Fowler, T. Horn, C. Hyde, S. Lassiter, P. Medeiros, H. Mkrtchyan, J. Murphy, J. Roche, V. Tadevosyan, B. Wojtsekhowski | ||
| − | MAGNET AND DESIGN (Charles, Paulo, Steven, Mike) | + | |
| + | '''MAGNET AND DESIGN (Charles, Paulo, Steven, Mike)''' | ||
* Analysis of magnet fringe field data and comparison to calculation is ongoing | * Analysis of magnet fringe field data and comparison to calculation is ongoing | ||
| Line 9: | Line 10: | ||
::* Also need to take into account CPS in overall cable layout | ::* Also need to take into account CPS in overall cable layout | ||
| − | * Action items: | + | '''* Action items:''' |
::* Send updated DVCS kinematics table with settings moved to Hall C from Hall A to Steven L. | ::* Send updated DVCS kinematics table with settings moved to Hall C from Hall A to Steven L. | ||
::* Check with Brad S. on cable routing, patch panel, etc. | ::* Check with Brad S. on cable routing, patch panel, etc. | ||
| Line 15: | Line 16: | ||
| − | FRAME (Carlos) | + | '''FRAME (Carlos)''' |
* Construction started, but on hold until end of lockdown - currently expect re-opening after May 11 | * Construction started, but on hold until end of lockdown - currently expect re-opening after May 11 | ||
| Line 23: | Line 24: | ||
* Cabling of LED connectors is ongoing | * Cabling of LED connectors is ongoing | ||
| − | * Action item: check on cable making effort at JLab | + | '''* Action item: check on cable making effort at JLab''' |
| − | CRYSTALS (Vladimir, Tanja) | + | '''CRYSTALS (Vladimir, Tanja)''' |
* Had email communication with Crytur. Vendor is working on a proposal for crystal delivery for rest of FY20 and FY21 - expect update after 4/17 | * Had email communication with Crytur. Vendor is working on a proposal for crystal delivery for rest of FY20 and FY21 - expect update after 4/17 | ||
| Line 33: | Line 34: | ||
::* SICCAS crystals were preselected in Shanghai by a FCAL collaborator from Wuhan U. - 13% of all inspected crystals were rejected based on simple visual inspection | ::* SICCAS crystals were preselected in Shanghai by a FCAL collaborator from Wuhan U. - 13% of all inspected crystals were rejected based on simple visual inspection | ||
| − | * Action items: | + | '''* Action items:''' |
::* check on options for Crytur to send ~70-100 crystals to JLab on 30 August. These would arrive in multiple boxes with different invoices due to issues with the carrier on vendor's side. | ::* check on options for Crytur to send ~70-100 crystals to JLab on 30 August. These would arrive in multiple boxes with different invoices due to issues with the carrier on vendor's side. | ||
::* check on options for both vendors to keep producing and sending crystals - options for storage at JLab | ::* check on options for both vendors to keep producing and sending crystals - options for storage at JLab | ||
| − | HV DIVIDERS (Vladimir, Tanja) | + | '''HV DIVIDERS (Vladimir, Tanja)''' |
| + | |||
| + | * Ho San's estimates assuming PMT gain 10^6 and integration time 50ns show anode currents of 13mA (beam current: 11uA) and 80mA (beam current: 50uA) for the most extreme experiment kinematics/configurations | ||
| + | ::* three orders of magnitude higher than the 100uA PMT limit | ||
| + | ::* would require to reduce gain of PMT by 1000 and rest of amplification done by divider | ||
| + | ::* for HV divider might need gain of 25 - regarding increased nonlinearity, note that unlike Primex NPS does not need absolute detection efficiency | ||
| + | |||
| + | '''* Action items:''' | ||
| + | ::* Check Ho-San's numbers from full-scale calculations with, e.g. CPS framework or direct calculations with photon component only | ||
| + | ::* Evaluate how to do physics with possibly reduced PMT gain, e.g. model from G0 experiment | ||
| + | |||
| + | |||
| + | '''DVCS WITH POSITRONS PROPOSAL (Carlos)''' | ||
| + | |||
| + | * Investigation of DVCS with positron compared to electron beam | ||
| + | |||
| + | * Projections complete, discussions of systematics due to positron beam ongoing | ||
| + | |||
| + | * Expect to circulate proposal in 3-4 weeks. PAC submission deadline is 1 June. | ||
| + | |||
| + | |||
| + | '''TCS - LOW MOMENTUM PROTONS AND TRACKING (Vardan) | ||
| + | ''' | ||
| + | * Slides posted - presentation in 4/17 CPS meeting | ||
| + | |||
| + | |||
| + | '''NEXT MEETING: THURSDAY 7 MAY AT 9:00AM (ET)''' | ||
Latest revision as of 13:54, 17 April 2020
PARTICIPANTS: V. Berdnikov, A. Camsonne, C. Munoz-Camacho, R. Ent, M. Fowler, T. Horn, C. Hyde, S. Lassiter, P. Medeiros, H. Mkrtchyan, J. Murphy, J. Roche, V. Tadevosyan, B. Wojtsekhowski
MAGNET AND DESIGN (Charles, Paulo, Steven, Mike)
- Analysis of magnet fringe field data and comparison to calculation is ongoing
- The Hall A/C engineering/design team is working on NPS cable layout
- Two main routing options, one more direct but also makes cables longer - seems fine from NPS point of view, but need to check with Hall C
- Also need to take into account CPS in overall cable layout
* Action items:
- Send updated DVCS kinematics table with settings moved to Hall C from Hall A to Steven L.
- Check with Brad S. on cable routing, patch panel, etc.
- Include CPS in overall cable layout
FRAME (Carlos)
- Construction started, but on hold until end of lockdown - currently expect re-opening after May 11
- Crystals and LED connectors arrived in Orsay
- Cabling of LED connectors is ongoing
* Action item: check on cable making effort at JLab
CRYSTALS (Vladimir, Tanja)
- Had email communication with Crytur. Vendor is working on a proposal for crystal delivery for rest of FY20 and FY21 - expect update after 4/17
- A few boxes of Crytur crystals that arrived last month await to be inspected. Furthermore, the expected SICCAS crystal arrived (60 of those to NPS) and await inspection
- SICCAS crystals were preselected in Shanghai by a FCAL collaborator from Wuhan U. - 13% of all inspected crystals were rejected based on simple visual inspection
* Action items:
- check on options for Crytur to send ~70-100 crystals to JLab on 30 August. These would arrive in multiple boxes with different invoices due to issues with the carrier on vendor's side.
- check on options for both vendors to keep producing and sending crystals - options for storage at JLab
HV DIVIDERS (Vladimir, Tanja)
- Ho San's estimates assuming PMT gain 10^6 and integration time 50ns show anode currents of 13mA (beam current: 11uA) and 80mA (beam current: 50uA) for the most extreme experiment kinematics/configurations
- three orders of magnitude higher than the 100uA PMT limit
- would require to reduce gain of PMT by 1000 and rest of amplification done by divider
- for HV divider might need gain of 25 - regarding increased nonlinearity, note that unlike Primex NPS does not need absolute detection efficiency
* Action items:
- Check Ho-San's numbers from full-scale calculations with, e.g. CPS framework or direct calculations with photon component only
- Evaluate how to do physics with possibly reduced PMT gain, e.g. model from G0 experiment
DVCS WITH POSITRONS PROPOSAL (Carlos)
- Investigation of DVCS with positron compared to electron beam
- Projections complete, discussions of systematics due to positron beam ongoing
- Expect to circulate proposal in 3-4 weeks. PAC submission deadline is 1 June.
TCS - LOW MOMENTUM PROTONS AND TRACKING (Vardan)
- Slides posted - presentation in 4/17 CPS meeting
NEXT MEETING: THURSDAY 7 MAY AT 9:00AM (ET)