ELOG DESPEC

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

DESPEC

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Entry time:	Sun Mar 30 09:18:32 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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