Difference between revisions of "Wednesday, April 19, 2017"
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#* Discuss whether trigger should be modified. [https://logbooks.jlab.org/entry/3470325 Scaler logbook entry] | #* Discuss whether trigger should be modified. [https://logbooks.jlab.org/entry/3470325 Scaler logbook entry] | ||
#* Vardan to discuss SHMS shower calibrations [https://logbooks.jlab.org/entry/3469647 Logbook entry] | #* Vardan to discuss SHMS shower calibrations [https://logbooks.jlab.org/entry/3469647 Logbook entry] | ||
| + | #* [https://hallcweb.jlab.org/DocDB/0008/000852/001/HMS_DC_Update.pdf HMS DC Efficiency] - Carlos Yero | ||
| + | #* [https://hallcweb.jlab.org/DocDB/0008/000853/001/hms_calib_beam.pdf HMS Hodoscope Calibration Results] - Simona Malace | ||
# Review systems owners and update information | # Review systems owners and update information | ||
# Commissioning plan updates from detector systems | # Commissioning plan updates from detector systems | ||
| Line 28: | Line 30: | ||
=== General === | === General === | ||
| − | + | * Joerg Rheinhold mentioned that the field at the aerogel PMT's should be simulated/measured | |
| − | + | ** Steve saw no field with a probe | |
| − | + | ** A logbook entry is needed with simulation calculations and measurements | |
| − | + | * Mark showed some [https://logbooks.jlab.org/entry/3470325 slides] regarding the rates in the SHMS | |
| − | + | ** Currently we have the maximum accidental rate | |
| + | ** The question is weather or not we need to modify the current trigger logic | ||
| + | ** This is a very invasive procedure | ||
=== Beam Line === | === Beam Line === | ||
| − | + | * No update provided | |
=== Trigger/DAQ === | === Trigger/DAQ === | ||
| − | + | * No update provided | |
| − | |||
=== HMS === | === HMS === | ||
==== 6 GeV Drift Chambers ==== | ==== 6 GeV Drift Chambers ==== | ||
| − | * https://hallcweb.jlab.org/DocDB/0008/000852/001/HMS_DC_Update.pdf | + | |
| + | * Carlos showed some [https://hallcweb.jlab.org/DocDB/0008/000852/001/HMS_DC_Update.pdf slides] regarding the HMS drift chamber per wire efficiencies | ||
| + | * Two planes in DC2 had an incorrect mapping, when fixed the efficiencies look good | ||
==== 12 GeV Drift Chambers ==== | ==== 12 GeV Drift Chambers ==== | ||
| − | + | * The chambers are the same structure as SHMS and they are built, tested, and stable | |
| + | * Each chambers has a couple of wires with no signals, the problem is likely internal | ||
| + | ** Per chamber there are 2 wires that are dead, one is in the corner | ||
| + | * If necessary the chambers could be opened up and the wires diagnosed and fixed | ||
| + | * Cables need to be made and tested | ||
| + | * Brad Sawatzky has a DAQ which can test a single chamber and if needed then he could integrate another fast bus crate to test both simultaneously | ||
| + | * We need 76 discriminator cards for the new chambers we need to see how many are available | ||
| + | ** There are 72 in HMS currently | ||
==== Hodoscopes ==== | ==== Hodoscopes ==== | ||
| − | + | * Simona showed some [https://hallcweb.jlab.org/DocDB/0008/000853/001/hms_calib_beam.pdf slides] regarding the first stab at the calibrations | |
| + | * More tweaks are required, and more diagnostic plots to come | ||
==== Aerogel ==== | ==== Aerogel ==== | ||
| − | + | * No update provided | |
| − | |||
==== Heavy Gas Cherenkov ==== | ==== Heavy Gas Cherenkov ==== | ||
| + | * No update provided | ||
| + | ==== Shower ==== | ||
| − | + | * Vardan reported that the HMS calorimeter was calibrated utilizing run 303 and is close to previous HMS/SOS analyses | |
| − | |||
=== SHMS === | === SHMS === | ||
| Line 72: | Line 85: | ||
==== GEM ==== | ==== GEM ==== | ||
| − | + | * The GEM has been installed between the SHMS drift chambers, see the logbook entry: | |
| + | * The GEM DAQ has been installed in the SHMS electronics hut | ||
| + | * Work is ongoing to setup the DAQ so that it can eventually be configured into the Hall C DAQ | ||
==== Nobel Gas Cherenkov ==== | ==== Nobel Gas Cherenkov ==== | ||
| − | + | * No update provided | |
==== Drift Chambers ==== | ==== Drift Chambers ==== | ||
| − | + | * Eric Christy showed some [https://hallcweb.jlab.org/doc-private/ShowDocument?docid=851 slides] | |
| + | ** The SHMS chambers performed well | ||
| + | ** There were 2 dead wires although it is though that these can be recovered | ||
| + | ** t0 offsets per wire have been implemented and the residuals have improved as expected | ||
| + | ** The two planes with low efficiencies contained the missing wires | ||
| + | ** Drift time along the wire is not completely understood at the moment, this will be looked into at a later date | ||
| + | ** The residuals have been reduced to 300 um | ||
| + | ** Ideally after alignment they expect to obtain a resolution on the order of 150 um | ||
==== Hodoscopes ==== | ==== Hodoscopes ==== | ||
| − | + | * Simona will be trained by Sam on how to mount the PMT's on the quartz bars so that a ~200 micron (or thinner) cookie is obtained - this should happen during the second half of May | |
| + | ** It was suggested that Simona should ask Sam to check on the expiration date of the glue | ||
| + | * Simona will measure the quantum efficiency of the new UV glass PMTs; Carl Zorn will help Simona setting up a test stand for the QE measurements | ||
| + | * She is working with a vendor to commit to a particular spec for the UV glass, however their typical a unicorn | ||
| + | * Steve finished setting up the DAQ for the cosmic test of the quartz bars; Simona is working on setting up the trigger | ||
| + | * Lead time on the new tubes is 12 weeks | ||
==== Heavy Gas Cherenkov ==== | ==== Heavy Gas Cherenkov ==== | ||
| − | + | * No update provided | |
==== Aerogel Cerenkov ==== | ==== Aerogel Cerenkov ==== | ||
| + | * No update provided | ||
| + | ==== Shower/Pre-shower ==== | ||
| − | + | * Dave Mack showed some [https://hallcweb.jlab.org/doc-private/ShowDocument?docid=848 slides] regarding the HERMES XP3461 base modeling, see his slides | |
| + | ** This is a follow up of the slides he showed last DWG meeting | ||
| + | ** He plans to model the gain and compare the difference between. the XP3462s | ||
| + | * Vardan showed a [https://logbooks.jlab.org/entry/3469647 slide] from his logbook entry | ||
| + | ** SHMS calibration was C++ code written based on HMS and SOS Fortran code | ||
| + | ** The resolution improves for run 484 where the HV was increased by 100V | ||
| + | ** The SHMS calorimeter is behaving as expected | ||
| + | * Hamlet commented that the resolutions we are obtaining are much better than what was obtained by the HERMES collaboration | ||
Latest revision as of 13:39, 19 April 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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- Enter Meeting ID: 895800575
- Press #
Agenda
- Status update from detector owners, calibrations, efficiencies, etc.
- SHMS Drift Chambers Status Update & To-Do - Eric Christy
- Doc on the SHMS Shower - Dave Mack
- Discuss measurement of field at detector PMTs.
- Discuss whether trigger should be modified. Scaler logbook entry
- Vardan to discuss SHMS shower calibrations Logbook entry
- HMS DC Efficiency - Carlos Yero
- HMS Hodoscope Calibration Results - Simona Malace
- Review systems owners and update information
- Commissioning plan updates from detector systems
- Address system specific points of interest for the Fall 2017 run
Minutes
General
- Joerg Rheinhold mentioned that the field at the aerogel PMT's should be simulated/measured
- Steve saw no field with a probe
- A logbook entry is needed with simulation calculations and measurements
- Mark showed some slides regarding the rates in the SHMS
- Currently we have the maximum accidental rate
- The question is weather or not we need to modify the current trigger logic
- This is a very invasive procedure
Beam Line
- No update provided
Trigger/DAQ
- No update provided
HMS
6 GeV Drift Chambers
- Carlos showed some slides regarding the HMS drift chamber per wire efficiencies
- Two planes in DC2 had an incorrect mapping, when fixed the efficiencies look good
12 GeV Drift Chambers
- The chambers are the same structure as SHMS and they are built, tested, and stable
- Each chambers has a couple of wires with no signals, the problem is likely internal
- Per chamber there are 2 wires that are dead, one is in the corner
- If necessary the chambers could be opened up and the wires diagnosed and fixed
- Cables need to be made and tested
- Brad Sawatzky has a DAQ which can test a single chamber and if needed then he could integrate another fast bus crate to test both simultaneously
- We need 76 discriminator cards for the new chambers we need to see how many are available
- There are 72 in HMS currently
Hodoscopes
- Simona showed some slides regarding the first stab at the calibrations
- More tweaks are required, and more diagnostic plots to come
Aerogel
- No update provided
Heavy Gas Cherenkov
- No update provided
Shower
- Vardan reported that the HMS calorimeter was calibrated utilizing run 303 and is close to previous HMS/SOS analyses
SHMS
GEM
- The GEM has been installed between the SHMS drift chambers, see the logbook entry:
- The GEM DAQ has been installed in the SHMS electronics hut
- Work is ongoing to setup the DAQ so that it can eventually be configured into the Hall C DAQ
Nobel Gas Cherenkov
- No update provided
Drift Chambers
- Eric Christy showed some slides
- The SHMS chambers performed well
- There were 2 dead wires although it is though that these can be recovered
- t0 offsets per wire have been implemented and the residuals have improved as expected
- The two planes with low efficiencies contained the missing wires
- Drift time along the wire is not completely understood at the moment, this will be looked into at a later date
- The residuals have been reduced to 300 um
- Ideally after alignment they expect to obtain a resolution on the order of 150 um
Hodoscopes
- Simona will be trained by Sam on how to mount the PMT's on the quartz bars so that a ~200 micron (or thinner) cookie is obtained - this should happen during the second half of May
- It was suggested that Simona should ask Sam to check on the expiration date of the glue
- Simona will measure the quantum efficiency of the new UV glass PMTs; Carl Zorn will help Simona setting up a test stand for the QE measurements
- She is working with a vendor to commit to a particular spec for the UV glass, however their typical a unicorn
- Steve finished setting up the DAQ for the cosmic test of the quartz bars; Simona is working on setting up the trigger
- Lead time on the new tubes is 12 weeks
Heavy Gas Cherenkov
- No update provided
Aerogel Cerenkov
- No update provided
Shower/Pre-shower
- Dave Mack showed some slides regarding the HERMES XP3461 base modeling, see his slides
- This is a follow up of the slides he showed last DWG meeting
- He plans to model the gain and compare the difference between. the XP3462s
- Vardan showed a slide from his logbook entry
- SHMS calibration was C++ code written based on HMS and SOS Fortran code
- The resolution improves for run 484 where the HV was increased by 100V
- The SHMS calorimeter is behaving as expected
- Hamlet commented that the resolutions we are obtaining are much better than what was obtained by the HERMES collaboration
