Meeting 2024 10 16

GMn GEM commissioning Meetings: WEDNESDAY 10:30am - 11:30am

Link to all previous meetings: GMn GEM Commissioning Meeting

Please use sbs_gems mailing list for plots/communications and HALOG entries relevant to GEMs!

HV conditioning [1][2][3]
- We noticed issue with the N2 pressure during bottle change over. We suspect the regulator is faulty and should be replaced
- We are also investigating the higher current draw in UV L4. One question is whether zero suppression on the power supply is configured correctly
- One CAEN power supply module is unable to maintain >580V on one channel. We were able to reproduce the problem in testlab. We are talking with DSG to see how it can be resolved.
Alex has set up CODA for GEM cosmic, but the APVs got stuck when using the internal pulser trigger.
General Update Slides [4]

Clean up cables
Set up DAQ computer (we will use adaq1)
Set up the third VTP crate (mostly done)
Rearrange fibers, HV and NIM cables.
Set up the scintillators and form the trigger
Connect the GEM to LV
Set up the MPDs (connecting the HDMIs to MPDs)
Begin low level test (find and replace any problematic APV, mpd, etc) (the front tracker is being tested)
Begin HV conditioning on N2
Switch over to ArCO2

Our GEM task list is here: workplan
Remove layers, isolate shorted sectors, repair APVs as needed
Joe B will add LV inputs for new GEMs in the stack, we will need to make those cables (4 more layers)
Install BB gas distribution from SBS line -- DSG will do this (completed)
Further calibrations of SBS gas mix
Repair/troubleshoot problematic CAEN crates -- DSG working on this
MPD testing and repair
Prepare and install pixel layers (long term)

Move layers into front and back tracker (done)
Upgrade the BB XY layer to SHV (done)
Fabricate remaining LV cables
Repair/replace L6 modules, install as last layer in Back Tracker, until EEL layer is ready (work in progress)
For cosmics, bring bars (HV+signal cables) to table and make a readout trigger. Work with techs to bring out 1 layer at a time?
For cosmics, move stack to be near RHRS, we can access all gas lines, setup readout, LV etc. (completed)
- Move BB crates to SBS rack (completed)
- Setup scintillators around the stack and run for a longer period. (work in progress)
Other work, setup gas flow in EEL to chamber. Finish HV upgrade & test. (work in progress)

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