Wednesday, July 26, 2017

From HallCWiki
Revision as of 12:44, 26 July 2017 by Pooser (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Meeting Information

  • Location CC L210A, 11 am
  • DocDB

Blue Jeans Connection Information

  1. Enter Meeting ID: 895800575
  2. Press #


  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



  • 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


  • 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


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



  • 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


  • 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


  • 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


  • 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