ELOG AIDA

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

AIDA

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Entry time:	Sat Mar 29 12:31:26 2025
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> > 10.20 DSSSD bias +100V leakage current +6.565uA - attachment 1 > > All system wide checks OK - attachments 2-7 > why is SYNC rollover target 0xe? > > FEE64 temps OK - attachment 8 > > per FEE64 1.8.W spectra 20us FSR - attachments 9-10 > slow comparator 0x64 > per FEE64 rate spectra - attachment 11 > ADC data item stats - attachment 12 > > slow compararator 0x14 > ADC data item stats - attachment 13 > > > > 11.10 Test + & test - cables disconnected at the outputs of the BNC PB-5 and EG&G Ortec 534 > > > slow comparator 0xf p+n rates dominated by 'hot' channels except aida03 & aida09 > per FEE64 rate spectra - attachment 14 > ADC data item stats - attachment 15 > > slow comparator 0xa p+n rates high ( 100-200k ) > per FEE64 rate spectra - attachment 16 > ADC data item stats - attachment 17 > > > slow comparator 0x14 p+n rates entirely due to 'hot' channels > per FEE64 rate spectra - attachment 18 > per FEE64 1.8.W spectra 20us FSR - attachments 19-20 > ADC data item stats - attachment 21 > > > 11.27 Remove ground cable from Al base plate to aida02 FEE64 adaptor PCB > > slow comparator 0xf p+n rates entirely due to 'hot' channels > per FEE64 1.8.W spectra 20us FSR - attachments 22-23 > per FEE64 rate spectra - attachment 25 > ADC data item stats - attachment 24 > > > slow comparator 0xa p+n rates high ( 30-130k ) but lower than previously > per FEE64 rate spectra - attachment 26 > ADC data item stats - attachment 27 > > 11.48 DSSSD bias +100V leakage current +7.845uA > > Remove LK3 ( local HV ground middle Si wafer ) > > slow comparator 0xa p+n rates high ( 55-135k ) but increase in rates appears to be due to 'hot' channels > per FEE64 1.8.W spectra 20us FSR - attachments 28-30 > per FEE64 rate spectra - attachment 31 > ADC data item stats - attachment 32 > > > > CAEN N1419ET ch #2 output connected to Tek TDS 210 DSO - powered from relay #6 > > ch 1 - ac - HV braid > ch 2 - ac - HV core > > ch # 2 OFF - attachment 33 > ch # 2 + 50V 0.000uA - attachments 34-35 > > with additional ThorLabs filter > ch # 2 + 50V 0.000uA - attachment 39 > > > ch 2 - dc, hi Z > > test - attachments 36-37 > test + attachment 38 > > 12.45 Install ThorLabs filter HV core ( no filter for HV braid ) > > slow comparator 0xa p+n rates high ( 40-130k ) but p+n rates dominated by 'hot' channels except aida03, aida11, aida12 where rates are generally higher per strip > per FEE64 rate spectra - attachment 40 > per FEE64 1.8.W spectra 20us FSR - attachments 41-42 > ADC data item stats - attachment 43 > > > > 14.55 Install ThorLabs filter HV braid ( filters for both HV core & braid ) > > slow comparator 0xa p+n rates high ( 50-150k ) two filters probably somewhat worse than one filter > per FEE64 rate spectra - attachment 46 > per FEE64 1.8.W spectra 20us FSR - attachments 44-45 > ADC data item stats - attachment 47 > > > Overall, effect of ThorLabs filters appears to belimited. Perhaps not unexpected as FEE64 adaptor PCBs also have a HV RC filter. > > > Encoding: HTML ELCode plain Suppress Email notification

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