ELOG AIDA

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

AIDA

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Entry time:	Sun Aug 17 01:10:33 2025
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> We restarted AIDA (a10277ttachment 6) this morning and checked rates (attachments 3/4) and waveforms (attachments 1/2). Temperatures are shown in attachment 5. > It seems consistent with what was observed yesterday. > > AIDA stopped and platform moved. > > The power cable from USB main power relay was connected to the wall and not the DESPEC 19" racks as expected. It has been corrected : it is now connected to the DESPEC 19" rack, has it should be. > AIDA was restarted after that. bPlast was disconnected from 2 booster cards. > We checked the rates (attachments 7,10 and 11 [linear scale]). They are quite similar, although aida01 rate has increased (maybe a cable issue), and rate from aida07 significantly decreased (it was really low yesterday as well). > The waveforms (attachments 8 & 9) are similar as the ones obtained earlier. > > bPlast has been reconnected to all booster cards. Rate increased a little (attachment 12) but broadly similar to that observed first thing this morning. > Then 2 booster cards were grounded, and the rates went up (attachments 13-16) > > Afterwards, one power cable was connected to the booster card on the short side, increasing the noise, as observed yesterday (attachments 17-20) > > The Rohde Schwarz PSU output was referenced to PSU ground ( 3mm cable to ground socket front panel ). It did not reduced much the noise (attachment 21) > Finally, the power supply was switched on, increasing the noise in AIDA (attachment 22). > > > After the meeting, we have chosen to reconnect bPlast to the booster : now all LIMOs are connected to the booster cards, the cards are powered and the SiPM are biased. The alarm for the short side has triggered (not full bias) > The Rohde & Scwarz PSU outputs is till referenced to its chassis ground. > See attachments 23-26 for the rates and waveforms in AIDA > > > 14.57 JG/JB added additional black cloth to reduce nPlast SiPM dark current : now it is around 16uA. Updated noise observations > > per FEE64 1.8.W spectra 20us FSR - attachments 27-28 > per FEE64 1Rate spectra - attachment 29 > ADC data item stats - attachment 30 > > aida02 asics #2-4 remain noisy c. kHz/channel > Most other p+n FEE64s are OK - the usual 'hot' channels but most other channel rates low > > 15.07 JG removed ground reference for Rohde & Schwarz PSU +4V output to bPlast booster cards > ADC data items atst - attachment 31 > Most FEE64s have significantly higher rates so the ground reference is doing 'something' > > 15.12 JG re-ground ref'd Rohde & Schwarz PSU +4V output to bPlast booster cards > ADC data item stats - attachment 32 > Rates for most FEE64s are reduced - some significantly - PSU ground ref is doing something reproducible > > 15.25 Christoph Scheidenberger reports FRS magnets ON > > 16.01 JG/JB TAMEX & NIM bin electrically isolated from AIDA stand/DESPEC platform. Screens of flat cables from bPlast to booster cards grounded to snout. > ADC data item stats - attachment 33 > per FEE64 1.8.W spectra 20us FSR - attachments 36-37 > per FEE64 Rate spectra - attachments 34-35 > > > 16.20 TAMEX & NIM bin electrically isolated from AIDA stand/DESPEC platform. Screens of flat cables from bPlast to booster cards now connected together but electrically floating > > ADC data item stats - attachment 40 > per FEE64 1.8.W spectra 20us FSR - attachments 38-39 > per FEE64 Rate spectra - attachment 41 > Noted improvement in most FEE64 rates - aida04 improved significantly > > > 16.31 TAMEX & NIM bin electrically isolated from AIDA stand/DESPEC platform. Screens of flat cables from bPlast to booster cards now connected together and grounded to NIM bin chassis. > ADC data item stats - attachment 42 > per FEE64 Rate spectra - attachment 43-44 > per FEE64 1.8.W spectra 20us FSR - attachments 44-46 > Continued, imcremental improvement in FEE64 rates Encoding: HTML ELCode plain Suppress Email notification

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