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:

Thu Aug 3 09:21:26 2023

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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.

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ELOG V3.1.4-unknown