Difference between revisions of "Wednesday, July 26, 2017"
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== Agenda == | == Agenda == | ||
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# Commissioning plan updates from detector systems | # Commissioning plan updates from detector systems | ||
# Status update from detector owners, calibrations, efficiencies, etc. | # Status update from detector owners, calibrations, efficiencies, etc. | ||
| − | ## | + | ## [https://logbooks.jlab.org/entry/3479749 SHMS Pre-Shower signal equalization] -- Vardan |
| + | ## [https://hallcweb.jlab.org/DocDB/0008/000881/001/daq_test.pdf DAQ deadtime study] -- Ahmed | ||
| + | ## [https://hallcweb.jlab.org/DocDB/0008/000879/001/Detector_Slides.pdf Gas Cherenkov Calibration Update] -- Ryan | ||
| + | ## [https://hallcweb.jlab.org/doc-public/ShowDocument?docid=880 SHMS Q2 Measurement Update] -- Sam | ||
# Review systems owners and update information | # Review systems owners and update information | ||
# Address system specific points of interest for the Fall 2017 run | # Address system specific points of interest for the Fall 2017 run | ||
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=== General === | === 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 [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 | ||
| + | === 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 | |
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=== HMS === | === HMS === | ||
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==== 12 GeV Drift Chambers ==== | ==== 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 | |
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=== SHMS === | === SHMS === | ||
| Line 71: | Line 53: | ||
==== GEM ==== | ==== 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 | |
| − | |||
| − | |||
| − | |||
| − | |||
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==== 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 ==== | ||
| − | + | * 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] | |
| + | * 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 12:44, 26 July 2017
Meeting Information
- Location CC L210A, 11 am
- DocDB
Blue Jeans Connection Information
- https://bluejeans.com/895800575
- Just want to dial in on your phone?
- +1.408.740.7256 (US)
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- Press #
Agenda
- Commissioning plan updates from detector systems
- Status update from detector owners, calibrations, efficiencies, etc.
- SHMS Pre-Shower signal equalization -- Vardan
- DAQ deadtime study -- Ahmed
- Gas Cherenkov Calibration Update -- Ryan
- SHMS Q2 Measurement Update -- Sam
- Review systems owners and update information
- 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
