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  • From: eric mannel <mannel AT bnl.gov>
  • To: sphenix-hcal-l AT lists.bnl.gov
  • Subject: [Sphenix-hcal-l] iHcal temperatures, prelimary numbers
  • Date: Tue, 18 Aug 2020 12:30:43 -0400

I will have a full report for the next HCal meeting, but here is a very preliminary summary of temperatures in the iHCal.  Using a standalone set of thermocouples provided to me by Rob, i placed 4 thermocouples inside the iHCal.  One mounted in thermal contact with the interface board, 1 floating in the endcap box, 1 in thermal contact with a preamp, and 1 floating near the preamp. A total of 24 preamps, 1 interface and 1 LED board were powered. Prior to powering the sector, the 4 thermocouples were reading 27.7C to 28.3C, which was about the temperature of 912.  After 1 hour of being powered, the the 4 thermocouples were reading between 31C and 33C.  Poking inside the endcap, the hottest point I could find was the regulators, which were approaching 50C.  The data was recorded and I need to work with Rob to extract it.

I would like to rerun this little exercise again later this week and record the temps of the 24 thermistors connected to the preamps (I  thought I was doing that but this is the old style interface and I did not hook up the test pulse cable, so the read back does not make sense), and run for a couple of hours.

As I have said in the past, I don't think there is a thermal issue in the region of the preamps.  I do think we need to have a way of getting some air flow across the heat sinks that will be installed on the next generation of interface boards.

Eric

--

Eric Mannel, Ph.D.
PHENIX Group
Dept of Physics
Brookhaven National Lab.
631/344-7626 (Office)
914/659-3235 (Mobile)




  • [Sphenix-hcal-l] iHcal temperatures, prelimary numbers, eric mannel, 08/18/2020

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