Meeting 2025 01 08
From Hall A Wiki
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!
Contents
Progress from this past week
- Completed cabling the GEMs on the platform and low level test [1]
- Discussion of shielding for GEM hut
- Pedestal data taking on Monday
- some APVs have to be commented out as they could not be configured
- 2 MPDs could not be found
- sbsvtp4 is likely missing 10gigE fiber
Plan for the next few days
- Put in the fiber on sbsvtp4
- fix the remaining APV and MPDs issues
- Increases gas flow to GEMs. The GEMs are getting ArCO2 since last Thursday, but at a reduced flow rate.
- Check HV connections. The layer 15 is missing a few HV cables, they are too high and out of reach.
Setting up cosmic readout
- 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
GEp preparations
- 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)
Suggested order of work
- 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)
DAQ updates (Ben, Bryan, Alex)
- Implement and test histogram method
