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

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Entry time:	Sat Mar 29 11:27:10 2025
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> > all system wide checks OK except aida10 failed ADC calibration > > Attachment 1 ADC data item stats > Attachment 2 FEE64 temps OK > Attachment 3 DSSSD bias & leakage currents OK > > > > > > DSSSD bias to left (looking upstream) wafer only > FEE64s 10 & 12, 14 & 16 > > Attachments 4 & 5 1.8.W spectra 20us FSR > > Attachment 6 ADC data item stats > > Attachment 7 DSSSD bias & leakage current > > > > > ASIC check all FEE64s > > DSSSD bias to middle (looking upstream) wafer only > FEE64s 1 & 3, 5 & 7 > > Attachments 8 & 9 1.8.W spectra 20us FSR > > Attachment 10 ADC data item stats > > Attachment 11 DSSSD bias & leakage current > > > > > > ASIC check all FEE64s > > DSSSD bias to right (looking upstream) wafer only > FEE64s 9 & 11, 13 & 15 > > Attachments 12 & 13 1.8.W spectra 20us FSR > > Attachment 14 ADC data item stats > > Attachment 15 DSSSD bias & leakage current > > > > Conclusions > > ADC data item stats -> 300-400k > > n+n 1.8.W spectra show large signal excursions > > p+n 1.8.W spectra for biased Si wafers OK - unbiased Si wafers show large signal excursions > > > DSSSD#1 leakage currents 1.850+2.220+1.990=6.06uA cf. 5.095uA with all 3 wafers biased > DSSSD#2 leakage currents 1.510+1.580+2.350=5.44uA cf. 5.235uA > > > Right wafer (looking upstream) > > Bias(V) -20 -40 -60 -80 -100 > DSSSD#1 I_L(uA) -1.135 -1.475 -1.645 -1.750 -1.805 > DSSSD#2 I_l(uA) -1.625 -2.020 -2.205 -2.320 -2.360 > > Middle wafer (looking upstream) > > Bias(V) -20 -40 -60 -80 -100 > DSSSD#1 I_L(uA) -1.540 -1.870 -2.035 -2.150 -2.210 > DSSSD#2 I_l(uA) -0.985 -1.285 -1.465 -1.575 -1.615 > > Left wafer (looking upstream) > > Bias(V) -20 -40 -60 -80 -100 > DSSSD#1 I_L(uA) -0.735 -0.915 -1.005 -1.080 -1.110 > DSSSD#2 I_l(uA) -0.865 -1.205 -1.400 -1.510 -1.560 > > Bias versus leakage cuurent characteristic of each wafer of each DSSSD indicates diode behaviour. > > Note LK1 not fitted - presumably LK3 of mid/top p+n FEE64 adaptor PCBs (aida01 and aida05) connecting n+n bias to gnd is sufficient to establish circuit. > > > > > 15.50 Re-connect bias to all 3x Si wafers p+n junction side bias rings > > ASIC check all FEE64s > > Attachments 16 & 17 1.8.W spectra 20us FSR > > Attachment 18 ADC data item stats > > Attachment 19 DSSSD bias & leakage current > > Conclusion - status quo ante restored > > > > 16.40 Remove aida01 & aida05 LK3, add aida04 & aida08 LK1 > > ASIC check all FEE64s > > Attachments 20 & 21 1.8.W spectra 20us FSR > > Attachment 22 ADC data item stats > > Attachment 23 DSSSD bias & leakage current > > Conclusion - no change > > > > 17.00 Add Thorn-Lab HV filters DSSSD#1 & #2 > > > ASIC check all FEE64s > > Attachments 24 & 25 1.8.W spectra 20us FSR > > Attachment 26 ADC data item stats > > Attachment 27 DSSSD bias & leakage current > > Conclusion - aida09-aida12 no change, aida13-aida16 -> 300-400k > I do not know why there's a difference between DSSSD#1 & #2 but more important point (probably) no improvement aida09-aida12 > Thorn Lab HV filters removed - status quo ante restored > > > 18.02 Remove LK2 & LK4 all top p+n adaptor PCBs (aida13, 5, 14, 9, 1, & 10) > > ASIC check all FEE64s > > Attachments 28 & 29 1.8.W spectra 20us FSR > > Attachment 30 ADC data item stats > > Attachment 31 DSSSD bias & leakage current > > Conclusion - no change cf. 16.40 test > > > > 19.10 Re-order power cabling at AIDA FEE64 PSUs from ... > > Top 1-3 2-4 9-10 11-12 > Bottom 5-7 6-8 13-14 15-16 > > to ... > > Top 1-2 3-4 9-10 11-12 > Bottom 5-6 7-8 13-14 15-16 > > > ASIC check all FEE64s > > Attachments 32 & 33 1.8.W spectra 20us FSR > > Attachment 34 ADC data item stats > > Attachment 35 DSSSD bias & leakage current > > Conclusion - all p+n FEE64 rates c. 100k, or less, n+n FEE64 rates c. 400k > > FEE64 adaptor PCB config > > LK2-LK3-LK4 fitted for all bottom p+n FEE64s (aida11, 3, 12, 15, 7, 16) > > LK1 fitted n+n FEE64s aida06 & aida02 only Encoding: HTML ELCode plain Suppress Email notification

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