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:

Wed Aug 2 08:44:00 2023

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09.40 Al snout electrically connected ( < 1 Ohm ) to Al gasket and Al base plate
      Al snout electrically isolated ( > 20 MOhm ) from aida02 FEE64 adaptor PCB and AIDA support frame

FEE64 temperatures OK - attachment 1
      DSSSD bias +100V leakage current +7.565uA - attachment 2

All system wide checks OK

Slow comparator 0x64
      per FEE64 rate spectra - attachment 3
      per p+n FEE64 1.8.L spectra - attachments 4-5
       aida01 pulser peak width 134 ch FWHM
      per FEE64 1.8.W spectra 200us FSR - attachments 6-7
      ADC data item stats - attachment 8

Slow comparator 0x14
      ADC data item stats - attachment 9
      per FEE64 rate spectra - attachment 10

Ground Al base plate to aida02 FEE64 adaptor PCB - appears to be marginally worse than without ground

per p+n FEE64 1.8.L spectra - attachments 11-12
       aida01 pulser peak width 120 ch FWHM
      per FEE64 1.8.W spectra 200us FSR - attachments 13-14
      per FEE64 rate spectra - attachment 15
      ADC data item stats - attachment 16

11.48 DSSSD bias +100V leakage current +11.055uA

Ground Al base plate to AIDA support frame - appears to be significantly worse than without ground

per FEE64 1.8.W spectra 200us FSR - attachments 17-18
      per p+n FEE64 1.8.L spectra - attachments 19-20
       aida01 pulser peak width 150 ch FWHM
      per FEE64 rate spectra - attachment 21
      ADC data item stats - attachment 22

11.48 DSSSD bias +130V leakage current +35.05uA

Ground Al base plate to aida02 FEE64 adaptor PCB - additional bias makes no significant difference

per FEE64 rate spectra - attachment 23
      per p+n FEE64 1.8.L spectra - attachments 24-25
       aida01 pulser peak width 118 ch FWHM
      per FEE64 1.8.W spectra 200us FSR - attachments 26-27
      ADC data item stats - attachment 28

14.03 DSSSD bias +100V leakage current +10.7uA
      Ground Al base plate to aida02 FEE64 adaptor PCB - re-check
      per FEE64 1.8.W spectra 200us FSR - attachments 28-29
      ADC data item stats - attachment 30

15.10 Add DSSSD HV cable from aida04 to aida02 - significantly worse
      Ground Al base plate to aida02 FEE64 adaptor PCB - re-check
      per FEE64 1.8.W spectra 200us FSR - attachments 31-32
      ADC data item stats - attachment 33

15.37 Switch from - to + polarity detector HV
      N1419ET from ch #3 to ch #2, all outputs non-floating
      LK1 ( local HV ground )removed from aida12, aida03, aida11 - installed aida04 
      LK3 ( DSSSD PCB ground ) installed aida03 ( no change )
      HV #1 core aida12, aida03, aida11 - braid aida04
      test + chain aida9, aida01, aida10, aida12, aida03, aida11 - connected to BNC PB-5 pulser
      test - chain aida04, aida02 - not connected to pulser

AIDA PSU cabling per https://elog.ph.ed.ac.uk/AIDA/879
      HV cable aida04 to aida02 - removed
      Ground Al base plate to aida02 FEE64 adaptor PCB - removed

FEE64 temperatures OK - attachment 35
      DSSSD bias -100V leakage current -7.155uA - attachment 36

Slow comparator 0x14
      per FEE64 rate spectra - attachment 37
      per p+n FEE64 1.8.L spectra - attachments 38-39
       aida01 pulser peak width 123 ch FWHM but note double peaking
      per FEE64 1.8.W spectra 200us FSR - attachments 40-41
      ADC data item stats - attachment 42
      Slow comparator 0x64
      ADC data item stats - attachment 43

Very similar performance to + polarity DSSSD HV tests

16.05 Add LK1 to aida02
      DSSSD bias -100V leakage current -7.770uA

Slow comparator 0x14
      per FEE64 1.8.W spectra 200us FSR - attachments 44-46
      ADC data item stats - attachment 47
      per FEE64 rate spectra - attachment 48

Improved noise for n+n FEE64s esp. aida04

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ELOG V3.1.4-unknown