Update on FMS Repair Stephen Trentalange STAR Management Meeting October 31, 2014 1
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Update on FMS Repair
Stephen TrentalangeSTAR Management Meeting
October 31, 2014
FMS Repair Work Summary• Restacking work nearly completed– Small Cells: 100% complete (476/476)– Large Cells: 95% complete (748/788)– External cabling 100% complete
• Running with DAQ: LED/Jet Patch trigger to diagnose problems with HV and signals
• Cable mapping so far is correct for HV/signals• Large cells: various problems ~24/572 channels• Small cells: HV problem: +6V power supply;
working with the electronics techs to diagnose.
Previous Problems:Updated• 216 Large Cells Left to complete– 34 old FMS Cells (216-34=182)– 90 from PSU by Nov 2 (182-90=92)– 12 bases available (92-12=80 still at PSU)
• Need 5 magnetic shields• Cabling/Stacking 1 week work• Noticed cracking in single small
cell/north side: seems stable
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Cosmic Rays Observed
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LED Signal
LED IssuesNo Signal
Yale Bases
Russian Bases
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Conclusions• Training of 2 extra on site experts in operation/ hardware for
FMS: Sam Heppelman/Grant Webb• Schedule for repair work on bases at PSU is tight, but a stream
of bases is arriving at BNL. Installation is not difficult.• Repair work on individual channels remains before run.• November-January Tasks:
– Repair work on individual channels– Small cell HV (+6V supply)– Spares for HV/LED control machines in hall– Spares for CW low voltage power supplies
• Work on “runaway trigger” problem with Jack/Chris/Eleanor
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Stacking the FMS
The South Side is Fully Stacked
The North Side is 90% Stacked
Need the remaining 150 PMT bases from PSU.
Survey of FMS location completed
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The Forward Meson Spectrometer1264 Pb-glass cells
788 large cells 476 small cells