Wednesday, October 4, 2017

Meeting Information

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Commissioning plan updates from detector systems
Status update from detector owners, calibrations, efficiencies, etc.
1. Heavy Gas Cerenkov Update - Ryan
2. GEM Update - Latif
3. SHMS Quartz Plane Update - Simona
4. HMS 12 GeV Chamber Update - Bishnu
Review systems owners and update information
Address system specific points of interest for the Fall 2017 run

Eric updated the detector readiness tables and added a DAQ/TRIGGER portion
Spokespeople for the upcoming experiments are urged to look at the listed triggers and contact Brad or Eric if they require any further trigger configurations
Detector groups were also urged to update the individual detector pages as well the readiness table so that it is clearly understood what still needs to be done prior to running in December
Eric advertised the new hallc online/offline monitoring working group meetings
Spokespeople for the upcoming runs are urged to present their needs for monitoring and replays at these meetings
The meetings will one held weekly on Tuesdays at 11 AM

Bishnu showed some slides
It was previously reported that there was many issues with the chambers
The chambers were moved to the TED highbay clean room and many issues were identified
Chamber 1 was opened, cleaned, and repaired
After HV was applied the chamber 1 it was still pulling 30 uA at 1850V with Ar:CO2
Chamber 2 was moved into hall-C and now chamber is drawing 110 nA at 2100V with Ar:Ethane
Future plans are connect chamber 2 to DAQ in the hall to measure the plateau curve and perform threshold studies
The outlook for the chambers is good

Latif showed some slides
The HV issues have been resolved and the GEM is back online
The misunderstanding of the latency is now understood
They have successfully performed latency scans in a robust manner
A standalone trigger with the production 3/4 trigger has been implemented
The latencies were directly measured on the scope and then translated to the CRL configuration
The latencies are clearly understood now
The TI firmware in ROC12 has been updated in conjunction with the rest of the SHMS ROC’s
The latency between the two firmware versions do not modify the delay between the L1A and the pre-trigger as expected
The GEM group are going to steal the DAQ afternoon/tonight for a cosmic run
No other triggers will be configured in this run for these integrated DAQ tests

Simona Showed some slides
The new PMTs were delivered September 26, 2017 (2 months late)
The PMTs have met spec despite catalog inflation
Previous cookie thickness was measured to be 500 um to 1 mm despite goal of < 200 um
On. Average the cookie thickness are now < 50 um
The manufacturing details of the cookie manufacturing, PMT coupling, and assembly processes were shown
They can now reliably make cookies and assemble quartz bars
12 bars anticipated to be ready by 3rd week of October and should be done with 16 by the middle of November
Carl Zorn performed QE studies for all 32 PMTs, they match what what ET reported
Simona performed gain measurements on the scope, they match with Carl’s who utilized a DAQ
The cosmic test stand is sitting on the Hall-C floor
It currently forms 5 space points with 4 fold coincidences to select perpendicular cosmic tracks through the quartz bars
Pedestals were annoyingly narrow!
3 weeks should be available for testing
The plane needs to be back in the stack prior to Nov 20

Ryan showed some slides
Documentation has been added to the DocDB and a README in the CALIBRATION directory in hallc_replay
New ability to update calibration constants
Updated pion efficiency for pion:electron ratio
Simulations are ongoing to better understand the loss of PE’s observed during the KPP run
The studies are ongoing