Wednesday, July 26, 2017

Meeting Information

• Location CC L210A, 11 am
• DocDB

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1. Enter Meeting ID: 895800575
2. Press #

Agenda

1. Commissioning plan updates from detector systems
2. Status update from detector owners, calibrations, efficiencies, etc.
   1. SHMS Pre-Shower signal equalization -- Vardan
   2. DAQ deadtime study -- Ahmed
   3. Gas Cherenkov Calibration Update -- Ryan
   4. SHMS Q2 Measurement Update -- Sam
3. Review systems owners and update information
4. Address system specific points of interest for the Fall 2017 run

Minutes

General

• Brad mentioned that on Tuesday of next week (8/1) a transformer will be shut down which will effect the counting house are assuming the generator works although that is not a certainty…be prepared
• SHSM DC gas system is on the fritz due to a low pressure interlock, see Jack's logbook entry
  • Gas is flowing but it is not smooth
  • Bottom line do not turn of the chamber HV

DAQ/Trigger

• Ahmed showed some slides
• 
He has been working on measuring the DAQ dead time
• There are some spurious events however they are negligible
• Spurious channels have been identified which is a valuable asset of the EDTM system
• The live time measurements are not yet understood however the data is in its infancy
• Maybe some issues with the OR between the random pulser and the clock pulser

HMS

12 GeV Drift Chambers

• HMS DC1 is undergoing an efficiency study
  • Should be done by the end of the week
• DC2 will be looked once the work on DC1 is complete

SHMS

GEM

• Latif reported on the GEM
• They have a temporary HV power supply which has been installed in the hut
• He is working on the decoding portion of the GEM readout system so that it can be integrated into HCANA
• It was suggested that we should focus on software instead of hardware at the moment

Hodoscopes

• Simona reported on the SHMS hodoscope
• Quartz bars have been removed from the frame
• Cookie making procedure is currently being developed
• The 3rd plane went back in the stack in the morning, it should be cabled by tomorrow
• The UK factory shipped the bases yesterday however the PMT ship date is unknown
• Carl Z. Is prepared to make the QE measurements, will need 5 days max to test all the PMTs
• Optimistically it should take 7 days to test the PMTs prior to being installed

Heavy Gas Cherenkov

• Ryan showed some slides
• The large peak at channel 100 persists regardless of fiducial cuts
• Logic does not support this peak
• He has been working on calculating the efficiency with results which are not yet understood
• Due to a bug in the calorimeter calibration this run for calculating efficiencies is not ideal, new calibration constants for the calorimeter to come

Shower/Pre-shower

• Vardan showed his logbook entry
• Cosmic test run checked aerogel and pre-shower (SHMS)
• The aim was to equalize the MIP response in the pre-shower plane
• HV from KPP runs were utilized
• Used parameter from photonis specs to convert adc->HV
• Result: procedure looks good with relatively consistent ADC response

Magnets

• Sam showed some slides
• He and Dave have been working on studying the linearity of Q2
• They concluded there is very short settling time, reproducibility is excellent, and cross talk b/w Q2 and Q3 is negligible
• Bad news: large asymmetry between positive and negative polarity
  • The hypothesis is that the hall probes may swapped or polarities may be swapped