Difference between revisions of "General Meeting Summary 8/2/17"
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(Created page with "SHMS AEROGEL DETECTOR (Arthur, Andres, Marco,...) * Aerogel tray exchange from SP-11 to SP-30 planned for next few days * Discussion about events detected from outside the acti...") |
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HMS AEROGEL DETECTOR (Arthur, Richard, Salim) | HMS AEROGEL DETECTOR (Arthur, Richard, Salim) | ||
| − | * CUA received | + | * CUA received 3 Burle [http://www.vsl.cua.edu/cua_phy/images/2/26/Burle_pmt_model.jpeg 8854 PMTs] from former SOS aerogel cherenkov detector (aerogel was n=1.05) - 5 more PMTs and the detector box are at JLab |
::* These PMTs are about 20 years old | ::* These PMTs are about 20 years old | ||
| − | ::* HV range up to 2500 V, tests at 2200 V show good signals on scope without noise | + | ::* HV range up to 2500 V, tests at 2200 V show good signals on scope without noise ([http://www.vsl.cua.edu/cua_phy/images/7/77/Burle_pmts.jpeg Pic1], [http://www.vsl.cua.edu/cua_phy/images/b/b2/Burle_test_setup_jlab.jpeg Pic2], [http://www.vsl.cua.edu/cua_phy/images/b/b8/Burle_signal_scope.jpeg Pic3], [http://www.vsl.cua.edu/cua_phy/images/9/93/Burle_test_setup_jlab_zoom.jpeg Pic4], [http://www.vsl.cua.edu/cua_phy/images/f/fa/Burle_pulse_generator_setting.JPG Pic5], [http://www.vsl.cua.edu/cua_phy/images/5/57/Burle_min_operating_hv.JPG Pic6], [http://www.vsl.cua.edu/cua_phy/images/e/ef/Burle_pmt_signal.jpeg Pic7], [http://www.vsl.cua.edu/cua_phy/images/6/64/Burle_signal_led_and_2mv_background_noise.JPG Pic8]) |
::* Action Item: Need to check single photoelectron and quantum efficiency for these PMTs | ::* Action Item: Need to check single photoelectron and quantum efficiency for these PMTs | ||
| − | * CUA also received 19 XP4500 PMTs, originally from MIT/Bates | + | * CUA also received 19 XP4500 PMTs, originally from MIT/Bates - [http://www.vsl.cua.edu/cua_phy/images/e/e4/List_of_good_PMTs.jpeg List of good PMTs] |
::* Initial checks in darkbox promising - full tests ongoing | ::* Initial checks in darkbox promising - full tests ongoing | ||
::* PMTs show small after-pulses - can be considered noise. Question: what was the helium source at MIT/Bates? | ::* PMTs show small after-pulses - can be considered noise. Question: what was the helium source at MIT/Bates? | ||
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| − | PION AND KAON STRUCTURE | + | [http://www.vsl.cua.edu/cua_phy/images/a/a2/8-2-meetingcopy.pdf PION AND KAON STRUCTURE FUNCTION](Dannie) |
* Completed kinematic studies for kaons, working on pions next | * Completed kinematic studies for kaons, working on pions next | ||
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| − | IMPACT OF REFLECTOR ON CRYSTAL LIGHT YIELD (Casey) | + | [http://www.vsl.cua.edu/cua_phy/images/3/37/Week_6_Update.pdf IMPACT OF REFLECTOR ON CRYSTAL LIGHT YIELD] (Casey) |
* Tested different materials, difference combinations, and different thicknesses | * Tested different materials, difference combinations, and different thicknesses | ||
Latest revision as of 12:19, 3 August 2017
SHMS AEROGEL DETECTOR (Arthur, Andres, Marco,...)
- Aerogel tray exchange from SP-11 to SP-30 planned for next few days
- Discussion about events detected from outside the active area for SP-11 aerogel tray
- Cosmic data suggest that these are scintillation events
- for comparison, data from full trays show background (not from aerogel) on order 1 photoelectron
- Action Item: estimate impact of few photoelectron background on particle identification (proton rejection)
HMS AEROGEL DETECTOR (Arthur, Richard, Salim)
- CUA received 3 Burle 8854 PMTs from former SOS aerogel cherenkov detector (aerogel was n=1.05) - 5 more PMTs and the detector box are at JLab
- CUA also received 19 XP4500 PMTs, originally from MIT/Bates - List of good PMTs
- Initial checks in darkbox promising - full tests ongoing
- PMTs show small after-pulses - can be considered noise. Question: what was the helium source at MIT/Bates?
DIRC (Greg)
- Discussion about optimizations of the monitoring system for transporting SLAC DIRC bars to JLab
- prototype built at Indiana
- expect transport to happen this fall
- Discussion about sensor tests and lens prototype tests at CERN
PION AND KAON STRUCTURE FUNCTION(Dannie)
- Completed kinematic studies for kaons, working on pions next
- Working on offshellness correction
- Next will start looking at detector simulation to include resolutions
IMPACT OF REFLECTOR ON CRYSTAL LIGHT YIELD (Casey)
- Tested different materials, difference combinations, and different thicknesses
- Teflon performs best, mylar not very good
- Next will test additional materials including Gore reflector (that was used in SHMS aerogel Cherenkov detector construction)
- Discussion about cutting reflector to shape rather than trying to wrap