ELOG AIDA

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

AIDA

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Thu Aug 3 14:16:12 2023

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15.16 DSSSD bias +100V leakage current +8.415uA

ThorLabs filters removed
      Test + & test - signals disconnected at outputs of BNC PB-5 and EG&G Ortec 534

aida02 & aida04 LK1 installed, aida01 LK3 not installed
      aida03 LK3 installed

test + & test- daisy chains installed

HV daisy chain - core -  aida12, aida03, aida11
      HV daisy chain - braid - aida04

slow comparator 0xa     p+n FEE64 rates high ( 50-125k )

per FEE64 rates - attachment 1
      per FEE64 1.8.W spectra 200us FSR - attachments 2-3
      adc data item stats - attachment 4

slow comparator 0xc    p+n FEE64 rates OK ( 15-40k ) dominated by 'hot' channels, low per channel rates in aida11, aida03, aida12

per FEE64 rates - attachment 5-6
      adc data item stats - attachment 7

slow comparator 0xf    p+n FEE64 rates low ( 7-17k ) entirely dominated by 'hot' channels

per FEE64 rates - attachment 8
      adc data item stats - attachment 9

slow comparator 0x14

per FEE64 rates - attachment 10-11
      adc data item stats - attachment 12

slow comparator 0x19

per FEE64 rates - attachment 13
      adc data item stats - attachment 14

slow comparator 0x1e

per FEE64 rates - attachment 15
      adc data item stats - attachment 16

slow comparator 0x23

per FEE64 rates - attachment 17
      adc data item stats - attachment 18

slow comparator 0x28

per FEE64 rates - attachment 19-20
      adc data item stats - aattachment 21

Ignoring 'hot' channels, reduce rates to < 50Hz/channel for p+n slow comparator threshold 120-150keV and n+n slow comparator threshold 350-400keV 
      If we assume that this estimates the 5x sigma threshold => p+n sigma c. 27keV rms, 64keV FWHM and n+n sigma c. 75keV rms, 176keV FWHM

Given FEE64-DSSSD cable lengths, optimal p+n performance is c. 40-50keV FWHM so current tests begin to approach this - little extrinsic noise observed for preamp signals
      We continue to observe significant ( though very much improved ) extrinsic noise for n+n strips so current noise performance could be improved by x2-3.

18.42 slow comparator 0x64
      stats & histograms zero'd

DSSSD bias +100V leakage current +9.040uA

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