ELOG DESPEC

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 11:37:49 2025
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11.25 System wide checks OK except aida06 clock fail status 6 - attachments 1-13 ADC data item stats - attachment 14 FEE64 temperatures OK - attachment 15 DSSSD bias & leakage currents - attachment 16 DSSSD#1 OK. DSSSD#2 leakage current has increased from c.5uA to c. 11uA overnight. 11.43 per FEE64 1.8.W spectra - 20us, 200us, 2ms, 20ms FSR - attachments 17-24 per FEE64 1.8.L spectra - attachments 25-26 aida12 1.8.L pulser peak width 143 ch FWHM aida02 1.8.L pulser peak width 439 ch FWHM Per FEE64 rate spectra - attachment 27 12.00 Cycled DSSSD#2 bias from -100V to 0 to -100V leakage current -7.7uA but ramping slowly (c. 5nA/10s ... ?) 13.26 DSSSD#2 bias -100V leakage current -8.54uA 15.46 - Noticed that DSSSD#1 braid no longer has filter, DSSSD#1 core still does. DSSSD#2 is unfiltered on both. - Swap FEE64 power connectors #3 with #4, and #6 with #7, this means both n+n FEE64s are on the same paired channel No significant change to stats - Notice braid was only connected to FEEs 4 and 8, which meant beam-left bias guard ring 0v was floating. Use T to bring bias braid over to FEES 2 and 6 as well. Middle bias guard ring 0v is still floating No significant change to stats, amplitude of 100 kHz waveform in n+n waves seems attenuated though aida12 1.8.L pulser peak width 76 ch FWHM aida02 1.8.L pulser peak width 438 ch FWHM Attachment 28 - HV leakage current Attachment 29 - FEE ADC stats Attachment 30 - p+n side waveforms Attachment 31 - n+n side waveforms Attachment 32 - p+n pulser peak widths Attachment 33 - n+n pulser peak widths 15.55 - Reattach filter to DSSSD#1 braid No major change, possible improvement in waveforms Attachment 34 - Stats Attachment 35,36 - waveforms 16.46 - Reattach LK1 jumper to FEES 2, 4, 6, 8 Waveforms look OK, p+n rate slightly worse? Attachment 37 - Stats Attachment 38, 39 - waveforms Attachment 40 - Per FEE Rates Encoding: HTML ELCode plain Suppress Email notification

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