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 11:24:30 2025
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> 08:00 Overnight at some point it appears that aida14 has stopped producing any ASIC data > It is currently sending data pause requests and data push requests but nothing else - attachment 1 > telnet into aida14 and run top to see what the current state of the FEE is. AIDAExec currently using 0% CPU usage. > FEE appears to have hung. - attachment 2 > Still passes all system wide checks. > When performing a check load can see the tclsh process take up CPU usage > > 09:02 AIDA out of time sorter. Going to perform a power cycle to see if it recovers FEE14 > AIDA14 recovered but ASIC2 still missing > > Current working hypothesis is ASIC2 on AIDA14 is dead and that the problem with AIDA05 is either DSSD, cable or adaptor board. > Given access would change the adapter board on AIDA05. > Could consider installing the old AIDA05 FEE above AIDA14 and moving the cables up 1. > Would retain the option of a speedybacktrack > > Alternatively the HEC events in AIDA05 are just above threshold. Can raise the HEC threshold > A threshold of 0x4 reduced the rate in the HEC channels considerably > A threshold of 0x6 removes entirely > > Note when the rate of HEC channels decreases can see the pulser in all channels of AIDA05 again. Showing that the adapter board is properly aligned > > 09:59 Had access so replaced the adapter card on AIDA05 > Did note that while replacing the card the right hand edge of the right hand ribbon cable was lifted slightly. > This could also have been the cause > > > 10:09 Restarted DAQ and there is no change to the behavior of AIDA05 > Still see events in HEC > Again raising threshold to 0x5 in ASIC1 largely removes them. > > 13.10 Attachments 3-5 > DAQ histogramming only enabled, waveforms/data transfer disabled, sampling ADCs OFF > ASIC check load > ASIC slow comparator all FEE64s all ASICS 0xa > ADC data item stats > > 13.17 Attachments 6-9 > DAQ histogramming & data transfer enabled, waveforms disabled, sampling ADCs OFF > ADC data item stats > NewMerger/Tape Server > > 18:00 As part of tests in the afternoon it was investigated powering only one DSSD worth of FEEs at a time > It was found that reasonable rates could be found for DSSD1 but poor rates only for DSSD2 > > To try and help isolate the two detectors the jumpers 2 and 4 were removed from FEEs 13, 5 and 14 (Top, DSSD2) > After powering on it was found there was no improvement and possible worse noise than before > > We were able to recover the rates in the 1DSSD setup so instead have removed FEE power from FEE5 and FEE14 Encoding: HTML ELCode plain Suppress Email notification

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