ELOG DESPEC

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

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Entry time:	Sun Mar 30 09:22:07 2025
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17.32 Power and detector bias cycle DSSSD bias & leakage current OK - attachment 1 FEE64 temperatures OK - attachment 2 except aida02 ASIC temp u/s ASIC settings 2024Mar27-11.25.32 slow comparator p+n FEE64s 0xa (100keV), n+n FEE64s 0xf (150keV) BNC PB-5 pulser amplitude 10.0V attenuation x10 frequency 25Hz polarity - tau_d 1ms tail pulse test - distributed by daisy chain to n+n FEE64s - chain terminated by 50 Ohm - currently connected to pulser test + distributed by daisy chain to p+n FEE64s - chain terminated by 50 Ohm - currently disconnected from pulser All system wide checks OK except aida02 & aida03 WR decoder status errors - attachment 10 WR timestamps OK - attachment 11 ADC data item stats - attachment 3 12 of 16 < 20k, all < 100k per FEE64 Rate spectra - attachment 4 per n+n FEE64 1.8.L spectra - attachment 5 1.8.W spectra - 20us FSR - attachments 6-9 preamplifier output noise generally very good Current ground configuration CAEN N1419ET LK fitted (non floating outputs) ground cable from aida04-aida12-aida02-aida09-aida01-aida05 HV#0 aida12-aida03-aida15 ground cable from aida08-aida16-aida06-aida10-aida14-aida13 HV#1 aida16-aida07-aida11 LK3 fitted aida03, aida07 LK1 fitted aida02, aida04, aid06, aida08 test - distributed by daisy chain to n+n FEE64s - chain terminated by 50 Ohm - currently connected to pulser test + distributed by daisy chain to p+n FEE64s - chain terminated by 50 Ohm - currently disconnected from pulser all DSSSD ribbon cable drain wires grounded to their resepctive AIDA adaptor PCBs JB observed open circuit between AIDA Al snout and AIDA support frame ( as expected ) AIDA PSU cabling as reported https://elog.ph.ed.ac.uk/DESPEC/560 Snout configuration: - all bPlast cables are disconnected and floating. - CC taped up all the cables and exit points in snout. - CC, JB covered the exit of the snout with two additional layers of aluminium foil which were also taped shut. To Do: - repower detector, see if similar conditions persist. - disconnect test - pulser, again see if conditions persist. - aida04 asic#1 investigate noise - aida14 asic #1 & asic #2 u/s? replace ASIC mezzanine? Encoding: HTML ELCode plain Suppress Email notification

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