ELOG DESPEC

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

DESPEC

Fields marked with * are required
Entry time:	Fri Nov 7 16:07:49 2025
Author*:
Subject*:
> - Ch 2 and 3 of CAEN HV module changed to negative polarity, Ch 0,1 still with positive polarity > - Bias changed from the n+n to the p+n side (now Ch 2,3) - att. 1 > > - EXPERIMENTS/AIDA/2025Oct28-14.55.15 -> Slow comparitor -> 0x64 (1MeV) p+n Pos. bias & n+n Neg. bias > > - Attachment 7: aida01 had its threshold lowered to 500 keV -> Rate increased from 500 to 6500 Hz > - Pulser inputs plugged in. > > > We have input a 1V pulser input into the data and have measured a peak in aida01 with a FWHM = 75 channel see attachment 9 and a FWHM in aida 14 (DSSD2) of also 76 channels which is similar to the results obtained in June from Nabil. > > > We cannot see anything from the n+n side as the signals are too noisy. Probably best to go with a higher trigger rate on the pulser and check with log scale tomorrow. It might also be worth checking the grounding on the y-strips as the problem with biasing with positive polarity is still seen in aida02 and aida04 (high noise repetition0 signal, attachment 2). > > Conclusion is that we have reproduced in part the result from Nabil. > > Tomorrow we will continue with the tests by lowering the thresholds and hopefully collect some data :-) Encoding: HTML ELCode plain Suppress Email notification

Attachment 1:
Drop attachments here...

ELOG V3.1.3-7933898