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 11:29:39 2025
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> > Attachment 1 - DSSSD bias & leakage current - OK > > Attachment 2 - ADC data item stats > > Attachment 3 - FEE64 temps - OK > > Attachments 4-7 - aida01, 02, 03 & 04 2..W spectra > > Noise observed for asics #1 & #2 of aida02 consistent with no cable attached - confirmed by visual inspection - ribbon cable disconnected from Samtec header of adaptor PCB > > To Do list > > 1) re-connect ribbon cable to aida02 adaptor PCB > 2) good quality ground to snout - use screws at inter-stage > 3) install heavy duty grounds > 4) ... > > > Attachment 8 - adc data item stats - slow comparator 0x64 > > Attachment 9 - per FEE64 rate spectra - slow comparator 0x64 > > Attachment 10 - per FEE64 rate spectra - slow comparator 0xa > > - > > 13:30 - Attach heavy duty ground to AIDA > > Attachment 11 - per FEE64 rate spectra - slow comparator 0xa > > Try power cycle as system ground changed significantly now > > Try to reattach aida04 TTY connector - still wrong > > Archive old tty logs (ttyUSB) to zip and delete them, makes easier to track startup > > Attachment 12 - per FEE64 rate spectra - slow comparator 0xa > > No major difference, aida01 quieter than before > > aida05 has some missing channels - loose ERNI? > > Attachements 13 & 14 - Waveforms > > Temporarily raise to 0x64 and test merger for DTAS synchro test later... all works good to MBS > Change NETVAR MERGE.LinksAvailable to 8 > > Notice one copper screw touching aluminium, add some kapton tape behind it to isolate it. No difference > > Voltage diff between aida02,aida06 < 1 mV > Voltage diff between copper bars < 0.5 mV (but not 0) > > A comment from DTAS people that they observed a large increase in noise recently - perhaps from accelerator > May indicate current power/gronud oddities? > > Attachment 15 - Rates at 0x1f (= 310 keV) > > DSSSD#1 reasonable (aida04 a bit bad), but mostly just pulser (25 Hz) > > DSSSD#2 much worse esp. p+n sides (aida05, aida07) > > ERNI connectors pushed in and feel fully in Encoding: HTML ELCode plain Suppress Email notification

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