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 12:31:31 2025
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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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