Difference between revisions of "Meeting 2022 02 02"

Revision as of 12:05, 2 February 2022

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!

From UVa, Anu and Sean will still be involved till Fall 2022 or early 2023. John B. will be involved through GEN-RP. 2 new students from Nilanga's group will be getting involved near beginning of the summer.
From Hampton, Manju and Saru will getting involved now and primarily focused on GEN-RP GEMs. Thir will also remained involved.
Zeke will still be involved during GEN and GEN-RP.
Holly will need to confirm, but I think she will be involved in the near future as well.
Currently it seems for near future activities and commissioning of GEN-RP GEMs in the Hall experience folks like Anu, Sean, John, Zeke will be involved to provide teaching and transition for new people from both UVa and Hampton.
New Hampton and UVa people have access to JLab, which is good.
There are discussions of constructing 4 new layers at UVa, so workforce will have to be considered for that as well.
Currently it is not clear what will run after GEN run period. Either SIDIS or GEP. Workforce should be reconsidered as that approaches.

This morning the BBCal threshold was increased to about 500 mV. Currently the excess currents on LD2 at a beam current of about 4.5-5 uAmp are reasonable and stable.
Anu and Sean recently replaced an entire new backplane and APVs for the 3rd UV layer and this returns that active area so there are no missing APVs.
Currently there are no extra 3 and 4 slot backplanes. So production of more spares needs to be considered

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 ===  Update on BB GEMs(Sean, Ezekiel, Holly, Anu) ===
-* Analysis of negative pulse study (https://logbooks.jlab.org/entry/3979464) still underway
+* This morning the BBCal threshold was increased to about 500 mV. Currently the excess currents on LD2 at a beam current of about 4.5-5 uAmp are reasonable and stable.
-* Negative pulse analysis ideas
+*Anu and Sean recently replaced an entire new backplane and APVs for the 3rd UV layer and this returns that active area so there are no missing APVs.
-** The occupancy of the negative signals
+*Currently there are no extra 3 and 4 slot backplanes. So production of more spares needs to be considered
-** Timing distribution of the negative signals
-** Fraction of negative signals to positive signals
-** Fraction of negative signals to positive signals on the same event
-** Fraction of negative signals to positive signals on the same event in the same APV
-** Fraction of negative signals to positive signals on the same event in the same MPD
-** Use tracking to see if negative signals correlate to the track position
-** Check if hits turned a negative signal into a positive one
 === Update on UVa GEM layers for GEn-RP (Anu, John, Thir) ===