ELOG DESPEC

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

DESPEC

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Entry time:

Thu Dec 5 22:00:11 2019

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15:30
  TD found the merger was running at ~43 Mb/s
  The odd-numbered FEE64s all had significant (>200k) disk rates
  ALL LEC/MEC fast discriminators and increased slow comparator from 0xa to 0x14
  Merger rate dropped to a more nominal value like 2.3 Mb/s
  Settings not saved

40Ar beam 300 MeV/u expected, but SIS problem at the moment.

23:00
  Leak currents are stable as previously (20-21 Nov) and entered to Google spreadsheet
  S4 vault is closed.
  Presently AIDA is running without tape storage
  System wide checks: 
    Master clock / aida01 sync reports error as expected; 
    All white rabbit decoders fail, but they are just off by 1 bit (no problem)
    Everything else okay.
  Stats look okay, but keep in mind above discriminator threshold -- see attachment 1
  Temperatures fine -- see attachment 2
  MBS looks okay -- we see a possible hint for the 1 bit difference with an "unexpected data word" -- see attachment 3 
  Data rate is 1.7 Mb/s, merger okay -- see attachment 4

23:30 
  Now we wait for the beam

00:05
  Attachments 5-11: results of system wide checks after collecting sync errors and WR errors from baseline - all ok

00:25
  Histograms zeroed at 00:25.

00:35

1.8.L pulser peak widths

FEE64       width(ch)
  1            92
  2            131
  3            75
  4            97
  5            89
  6            117
  7            90
  8            87
  9            223
 10            58
 11            112
 12            126

no peak observed on aida09

For comparison, pulser peaks measured on 13/11/19:

pulser peak widths:
                   FEE      width (ch)

aida01 - 130

aida02 - 168
             
                   aida03 - 83

aida04 - 83

aida05 - 200

aida06 - 148

aida07 - 250

aida08 - 81

aida09 - 134

aida10 - 190

aida11 - 333

aida12 - 149

2:00
  40Ar beam tuning is finished.  Intensity at S4 is about 3 kHz per spill.  1 spill per / 10 seconds
  MBS system cannot be used for online merging tonight, because NeuLAND group left their connection open
  We can merge offline using the White Rabbit timestamps
  Remove the beam blocking steel flange from in front of AIDA et al.
  Writing to file Dec19/R1

03.20 Rate, Stat, 1.8.L, 1.8.H, 1.8.W spectra - attachments 13-20
      Observe
       light ions in 1.8.L spectra
       low energy (<1.5GeV) heavy ions in 1.8.H spectra with most heavy ions stopping in DSSSDs 1 & 2
       Stat hit patterns indicate broad (c. 5cm FWHM) centred heavy ion peak

03.24 Detector biases & leakage currents OK - attachment 21
      FEE64 temperatures OK - attachment 22
      Good event statistics (12 of 12 < 50k) - attachment 23

System wide checks
      List All Sync Error Counters - attachment 24
      List all Sync Received Counters - attachment 25

Baseline invoked earlier c. 00.05
      Collect all SYNC Error Counters for Baseline
      Collect All White Rabbit status Error Counters for Baseline

04:07 2.6 mm Al degrader. 300Hz beam. 300 MeV/u 40Ar beam.

04.14 pulser peak seen in aida09 after performing ASIC check-load earlier in shift - width = 219 ch

04.45 1.8.H energy spectra (attachment 26/27)

06:08 attachments 28-30: detector bias/leakage currents ok
                         temperatures ok
                         good event statistics ok
                         all system wide checks ok

08:49 DAQ stop/start. TapeServer writing to No Storage. End of beam.

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Attachment 1: