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[sphenix-sepd-l] Bias Supplies

From: Eric Mannel <mannel AT bnl.gov>
To: "sphenix-sepd-l AT lists.bnl.gov" <Sphenix-sEPD-l AT lists.bnl.gov>, "sphenix-hcal-l AT lists.bnl.gov" <sphenix-hcal-l AT lists.bnl.gov>, "sphenix-emcal-l AT lists.bnl.gov" <sphenix-emcal-l AT lists.bnl.gov>
Subject: [sphenix-sepd-l] Bias Supplies
Date: Sat, 16 Sep 2023 10:46:18 -0400

Just a quick up date on the failed Bias supplies. I was on the phone with the US engineers. In 3 of the supplies that had a single channel that failed, it was traced down to failed DC-DC converter on the LV sub-assembly. They have replaced the LF modules and are running QA tests on them now, with an expectation that they will ship in the next 7-10 days. The failed components are being sent back to the manufacturer to understand the root cause of the failure. The fourth module that has an anomalous current reading with a fixed static DC load is still being investigated.

Once I get the repaired modules back I will run my standard tests (failed modules passed them the first time) and do some extended 2-3 day burn in test that was not done in the past. I think there are 1-2 modules in the EMCal/HCal system that have problems and I would like to swap those out in Oct for testing and repair so we have a set of spares for the 2024 run. I will coordinate that with the EMCal/HCal/sEPD experts.

Eric

--
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell)

[sphenix-sepd-l] Bias Supplies, Eric Mannel, 09/16/2023