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 Aug 19 10:37:50 2021
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11:30 BNC PB-5 pulser polarity chnaged from positive to negative (using LOCAL control) Swap BNC cables (top + bottom & left + right) from BNC PB-5 and Cooknell SA1 Sum Amp outputs Switch Cooknell SA1 Sum Amp output from negative to positive Observe pulser peak of c. 15 ch FWHM for aida08 and c. 35 ch FWHM for aida14 This probably indicates - noisy Cooknell SA1 - problem with T and/or Lemo-00 cable between BNC PB-5 and Cooknell SA1 > Investigate noise situation of AIDA (no DSSSDs connected) > > Figs 1-6: Waves, Pulser Peaks + Widths *before* any changes > - aida16 very noisy ASICS 1&2, normal ASICS 3&4 > - back-side aidas (02,04,06,08) worse resolution than front-side > - high-frequency noise still noticeable in waveforms > > Figs 7-8: Remove pulser in (from NIM rack) only > - no noticable change > > Figs 9-10: Remove all pulser cables from adapter boards > - looks improved > > Figs 11-12: HV Braid->GND Jumpers removed > > Fig 13-14: All HV cables removed > - aida06, aida14 isn't updating > - very noticable improvement > > Fig 15-16: Intermediate HV cables re-added > - signal worse in FEE64s with HV cables > - aida09, aida01, aida10, aida13, aida05, aida14 don't have HV interconnect cables, look good > > Conclusion: We see noticeable improvements removing the interconnect cables between FEE64s. > > Pulser widths now: > - aida14 (-ve amplitude) = 13.5 channels > - aida08 (+ve amplitude) = 40 channels (?)
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