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 20:00:15 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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