Difference between revisions of "Wednesday, July 26, 2017"

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=== General ===
 
=== General ===
  
=== Miscellaneous ===
+
* 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 [https://logbooks.jlab.org/entry/3479839 Jack's logbook entry]
 
+
** Gas is flowing but it is not smooth
 
+
** Bottom line do not turn of the chamber HV
=== Beam Line ===
+
 
+
 
+
 
+
=== Trigger/DAQ ===
+
 
+
  
 +
=== DAQ/Trigger ===
  
 +
* Ahmed showed [https://hallcweb.jlab.org/DocDB/0008/000881/001/daq_test.pdf 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 ===
 
=== HMS ===
 
==== 6 GeV Drift Chambers ====
 
 
 
  
 
==== 12 GeV Drift Chambers ====  
 
==== 12 GeV Drift Chambers ====  
  
 
+
* HMS DC1 is undergoing an efficiency study
 
+
** Should be done by the end of the week
==== Hodoscopes ====
+
* DC2 will be looked once the work on DC1 is complete
 
+
 
+
 
+
==== Aerogel ====
+
 
+
 
+
 
+
 
+
==== Heavy Gas Cherenkov ====
+
 
+
 
+
 
+
 
+
==== Shower ====
+
  
 
=== SHMS ===
 
=== SHMS ===
Line 70: Line 53:
 
==== GEM ====
 
==== GEM ====
  
 
+
* Latif reported on the GEM
 
+
* They have a temporary HV power supply which has been installed in the hut
==== Nobel Gas Cherenkov ====
+
* 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
 
+
 
+
==== Drift Chambers ====
+
 
+
 
+
  
 
==== Hodoscopes ====
 
==== 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 ====
 
==== Heavy Gas Cherenkov ====
  
 +
* Ryan showed [https://hallcweb.jlab.org/DocDB/0008/000879/001/Detector_Slides.pdf 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 ====
  
==== Aerogel Cerenkov ====
+
* Vardan showed his [https://logbooks.jlab.org/entry/3479749 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 [https://hallcweb.jlab.org/doc-public/ShowDocument?docid=880 some slides]
==== Shower/Pre-shower ====
+
* 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

Latest revision as of 13:44, 26 July 2017

Meeting Information

  • Location CC L210A, 11 am
  • DocDB

Blue Jeans Connection Information

  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