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:

Wed May 11 07:04:13 2022

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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

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