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:

Thu Mar 23 10:56:29 2017

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10.00 Investigating DSSD2 (MSL BB18-1000 3058-9) missing channels, found broken bond wires on rear side (~1/4).
      Replaced with 3058-3.
      Stack order now:
            |   3058-4
      beam  |   3058-3
            |   2998-23
            |   3058-5
            |   3058-6
            V   3058-7

12.00 All detectors, including the new replacement bias correctly (see att. 1).

14.00 Shunji has mentioned moving AIDA+BRIKEN forward by ~1m due to concerns about focusing the accurately at such a rearward position.
      The afternoon was spent removing the EURICA rails to enable the push forward of AIDA+BRIKEN.

18.00 The DAQ was set running with the new detector included. All system checks passed apart from nnaida19 ADC calibration.
      Pulser peak widths are mostly ~70-90ch for all FEEs. This is similar to Tuesday for the n-side FEEs (att. 2-4) and an improvement for the p-side FEEs (att. 5-7).
      Having said that, some spectra show peaks with shoulders or tails and a few feature multiple discreet peaks.
      We will look at this over the next couple of days, depending on when the final move/alignment of AIDA+BRIKEN is completed.

Complete table of pulser FWHM

nnaida# | Pulser FWHM (ch) |  Comments
          1    |       64         |
          2    |       168        |  Peak has shoulder
          3    |       77         |
          4    |       74         |
          5    |       79         |  Shoulder
          6    |       86         |  Shoulder
          7    |       80         |
          8    |       78         |
          9    |       68         |
          10   |       70         |
          11   |       80         |
          12   |       85         |
          13   |       70         |
          14   |       65         |
          15   |       92         |  Wide secondary peak in ASICs 1&4 of FWHM ~900ch @ 45k. Only few counts high (~1% height of pulser peak). Noise 10x height of pulser.
          16   |       99         |  Noise peak ~10x height of pulser peak.
          17   |       70         |  Low E tail.
          18   |       75         |
          19   |       96         |
          20   |       83         |
          21   |       68         |  Additional peaks either side of pulser: approx. relative heights > (1/30) (1) (1/100)
          22   |       69         |
          23   |       108        |  Noise peak ~10x height of pulser peak.
          24   |       110        |  Noise peak ~10x height of pulser peak.

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