General Meeting Summary 2/8/17

AEROGEL DETECTOR PERFORMANCE (Arthur)

• Aerogel detector performance with cosmics (JLab passwored required): https://logbooks.jlab.org/entry/3456299

• one channel not counting - problem is likely a cable or connector
• signal attenuation when going to counting house - on floor have 1 V signals

• Hall C detector Wiki: https://hallcweb.jlab.org/wiki/index.php/Wednesday%2C_February_07%2C_2017

• CUA main priority is to check if see signals (SEP), identified potential cabling issues and working on fixing them
• software: can adapt code from standalone version to general Analyzer
• Aside: before final installation need to switch tray to SP-30

TEMPERATURE DEPENDENCE OF PBWO4 LIGHT YIELD (Salina)

• Performed measurements at 18, 15, 10, and 5 degC so far - observed that light yield increases with decreasing temperatures consistent with literature
• trying to reach sub-zero temperatures

• need to check performance/attentuation of optical grease (Bicron?) at these temperatures - what did PANDA use?
• simple test: measure PMT response with LED and layer of optical grease at different temperatures
• practical consideration: warm up crystal before removing it from PMT

• Temperature gradient when cooling: currently waiting ~24 hours for crystal to equilibrate before taking measurements

• notice that on 2/7 freezer temperature went up to 15 degC for HIPS2017 tour

STATUS OF NPS PROTOTYPES (Arthur)

• 1x1 single crystal has been tested
• 3x3 needs some re-assembly - 8 crystals available for it

• Re-cap of Timelike Compton Scattering discussion from HIPS2017

• Perform simulations to make projections relative to other experiments on market - may ignore polarization

PIXEL DETECTORS (Rachel)

• Submitted Quarknet proposal for high school teachers to spend time at Fermilab and CERN learning about pixel detector research
• Detector installation is going well - discussion about additional developments

NEXT MEETING: WED 15 FEBRUARY AT 10:00 AM (EST)