Meeting 2024 07 24

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!

---

Progress from this past week

• DSG beginning the movement of the BB gas flowmeters to the SBS line.
• Testing of BB layers HV

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
• Further calibrations of SBS gas mix
• Install BB electronics crates and MPDs in new location
• Prepare and install pixel layers
• Repair/troubleshoot problematic CAEN crates -- DSG working on this
• MPD testing and repair (we should do this now in test lab, who can coordinate?)

Suggested order of work

• Move layers into front and back tracker
• Fabricate remaining LV cables
• Upgrade the BB XY layer to SHV (test it)
• Move a BB MPD crate near the working layers new LHRS, cable up a layer for readout
• 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?
• Option 2: Can we move stack to be near RHRS, we can access all gas lines, setup readout, LV etc. Setup scintillators around the stack and run for a longer period. Or do we want to do this putting the stack on the platform? Harder to repair.
• Other work, setup gas flow in EEL to chamber. Finish HV upgrade & test.

DAQ updates (Ben, Bryan, Alex)

• Implement and test histogram method

https://redmine.jlab.org/projects/sbs-daq-gep-gems/issues