Difference between revisions of "Meeting 2024 05 08"
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* rear GEMs at about 70% efficiency [https://logbooks.jlab.org/entry/4296942] | * rear GEMs at about 70% efficiency [https://logbooks.jlab.org/entry/4296942] | ||
* LV problem yesterday [https://logbooks.jlab.org/entry/4298629] | * LV problem yesterday [https://logbooks.jlab.org/entry/4298629] | ||
| − | * 12uA on deuterium has about the same rates at 15uA on hydrogen [https://logbooks.jlab.org/entry/4298022] | + | * 12uA on deuterium has about the same rates at 15uA on hydrogen [https://logbooks.jlab.org/entry/4298022][https://logbooks.jlab.org/entry/4299474] |
* Work tomorrow: | * Work tomorrow: | ||
** Individual power supply channels for L6M1, L3M3, L4M0 | ** Individual power supply channels for L6M1, L3M3, L4M0 | ||
** Armen will inspect and repair the LV cable connection | ** Armen will inspect and repair the LV cable connection | ||
** repair APVs on L6M1, L7M2, L4M1, L4M0 (I think we need to slide out L5 and L7?) | ** repair APVs on L6M1, L7M2, L4M1, L4M0 (I think we need to slide out L5 and L7?) | ||
| + | ** IR camera from techs | ||
=== Known issues === | === Known issues === | ||
Latest revision as of 11:07, 8 May 2024
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
Commissioning in GEn-RP
- Increased gas mix a bit last week [1][2][3][4]
- Tweaked the G1 HV on the rear tracker [5][6][7][8]
- rear GEMs at about 70% efficiency [9]
- LV problem yesterday [10]
- 12uA on deuterium has about the same rates at 15uA on hydrogen [11][12]
- Work tomorrow:
- Individual power supply channels for L6M1, L3M3, L4M0
- Armen will inspect and repair the LV cable connection
- repair APVs on L6M1, L7M2, L4M1, L4M0 (I think we need to slide out L5 and L7?)
- IR camera from techs
Known issues
- L3M3L2M1 (G2 &G3) — L3 faces the analyzer, L2 is high..decoupled now and only running L2M1 (L3M3 off)
- L4M0M1 (G2) — faces the analyzer, high ...decoupled now and only running L4M1 (L4M0 off)
- L5M2M3 (G2) - this one is low and possibly accessible, but needs to be slid out
- L6M0M1 (G3) (beamline side) – it’s high and likely hard to reach
- L6M2M3 (G3) — this one is low and possibly accessible, but probably too tight a fit to check anything
- L8M0M1 (G2 & G3) – might be easily checkable from the platform with a stepladder or the one with handrails. This is on the HCAL side. (currently kept off)
- L6M0 gas issue? - not a gas issue, probably one of the electrodes are disconnected from the HV distribution. This is most likely to have happened right at the detector. Another possible cause could be one of the gem foils being at reverse polarity.
- L9M2M3 - Transfer 2 HV channel does not ramp up beyond certain values. see https://logbooks.jlab.org/entry/4289553
Misc for GEn-RP
- Experts on call: [13]
