Wednesday, April 19, 2017

Meeting Information

• Location CC L210A, 11 am
• DocDB

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1. Enter Meeting ID: 895800575
2. Press #

Agenda

1. 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
2. Review systems owners and update information
3. Commissioning plan updates from detector systems
4. 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 wants Sam to educate her on how to mount the PMT's to the quartz bar, this should happen during the second half of May
  • Dave mentioned that Sam might want to check on the expiration date of the glue
• She will measure the quantum efficiency from moving to UV gas from the quartz glass
• She is working with a vendor to commit to a particular spec for the UV glass, however their typical a unicorn
• A DAQ setup is currently installed in the Hall, work is ongoing for the trigger
• Lead time on the new tubes is 12 weeks
  • The first step is a QE measurement followed by a gain curve, Carl Zorn said he will help with this

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