Difference between revisions of "Meeting 2022 07 27"

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===  Near term work plan ===
 
===  Near term work plan ===
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* We found long BNC cables from the physics storage and routed them so that we have a clock and trigger signals to start doing the low level tests as soon as the creates are on the network.
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* All the fibers are connected both in the MPDs and the VTPs. We routed one extra, long, fiber cable as we found that a single long fiber cable supports only 48 MPDs and we currently have 50 MPDs for all the inline layers. Two fiber path panels were also ordered for the new long fiber cable.
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* Also we are still waiting for the order of BNC cables.
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* Clock signal is available now in the SBS GEM bunker
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* Long fiber cable was routed and Armen/Mark from the electronics group will install the fiber patch panes today.
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* Power is supplied to the SBS GEM bunker via a transformer similar to BB GEMs - Jack
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* We will route network cables to all the crates/power strips today and then get all the crates on the network.
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* Network cables were routed to all the network controlled devices in the SBS GEM bunker
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* Jack is working on supplying power to the SBS GEM bunker.
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* Alex is working on getting all the VME crates and power strips on to the network now. Once this step is completed, we will start the low level tests.
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* Once all of the above steps are completed, we can start doing the low level test to debug cable connections and set clock-phase and other parameters correctly. Hopefully can be started later this week.
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* See installation plan for SBS here: [https://docs.google.com/presentation/d/1PRIdwXrCW0nQvuaufPRFt92eaUmA1Aev3Ty-5xexi4M/edit?usp=sharing plan]
 
* See installation plan for SBS here: [https://docs.google.com/presentation/d/1PRIdwXrCW0nQvuaufPRFt92eaUmA1Aev3Ty-5xexi4M/edit?usp=sharing plan]
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=== Update on UVa GEM layers for GEn-RP ===
 
=== Update on UVa GEM layers for GEn-RP ===
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* UVA GEM HDMI, HV and LV cables are all connected both from the detector side and crate sides.
+
* Gas shut-off valve configuration for outputs were changed as per the advice from Nilanga and Huong. Now we have two shut-off valves for the two separate outputs instead of T-ing the outputs and putting a single shut-off valve. This work is only partially completed as we had to order more shut-off valves for this. In the meantime, we disconnected the unfinished GEMs from the T connectors.
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*  The order of gas sut-off valves arrived and we have connected them and start flushing the GEMs with Nitrogen since Monday.
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* We successfully completed out very first HV test under Nitrogen in Hall! See the log entry: [https://logbooks.jlab.org/entry/4019873 SBS Inline UVA GEM first HV test under nitrogen in the Hall]
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* Plan to do a HV test on UVA GEMs sometime early next week.
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===  Update on BB GEMs ===
 
===  Update on BB GEMs ===

Latest revision as of 09:59, 27 July 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!

Near term work plan

  • All the fibers are connected both in the MPDs and the VTPs. We routed one extra, long, fiber cable as we found that a single long fiber cable supports only 48 MPDs and we currently have 50 MPDs for all the inline layers. Two fiber path panels were also ordered for the new long fiber cable.
  • Clock signal is available now in the SBS GEM bunker
  • Power is supplied to the SBS GEM bunker via a transformer similar to BB GEMs - Jack
  • Network cables were routed to all the network controlled devices in the SBS GEM bunker
  • Alex is working on getting all the VME crates and power strips on to the network now. Once this step is completed, we will start the low level tests.


Update on INFN GEM layers for GEn-RP

  • Ran up a new divider on the front layer GEM of the inline stack. Verified temperature and V/I consistent with divider run-up with no GEM.
  • Currently in Hall. Plan to install new dividers on upstream-most layer while we can easily access. Will need sliding platform to remove the layer to install the new dividers on the second layer.

Update on UVa GEM layers for GEn-RP

  • Gas shut-off valve configuration for outputs were changed as per the advice from Nilanga and Huong. Now we have two shut-off valves for the two separate outputs instead of T-ing the outputs and putting a single shut-off valve. This work is only partially completed as we had to order more shut-off valves for this. In the meantime, we disconnected the unfinished GEMs from the T connectors.
  • We successfully completed out very first HV test under Nitrogen in Hall! See the log entry: SBS Inline UVA GEM first HV test under nitrogen in the Hall

Update on BB GEMs

DAQ updates (Ben, Bryan, Alex)

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