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:	Sat Mar 29 12:27:59 2025
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> we are noticing we appear to see less implant events in detector 3 than we expect. This was first noticed in the xy spectra of the DSSD in the Go4 online. > As part of testing we have lowered the threshold in aida09 which from the xy appeared to have less events. > > Following this we still seemed to see less events. > > OH downloaded a selection of recent files to analyse. Looking at the total number of HEC events it appears that aida09, aida10 and aida12 are all seeing less HEC events than I would expect. > The ratio of HEC events in aida09 to aida11 was 0.36. > > Looking at the energies of the HEC events there appeared to be less events everywhere and not just a threshold issue. We thought it could then be radiation damage and poor > charge collection. To test this we raised the bias to 120V on DSSD3. > > The same test was again performed and the ratio again came out to be 0.36 > We did not appear to recover any HEC events > > Comparing the scaled energy distributions of aida09 and aida11 we see no evidence of a different energy response other than an increase in lower energy events in aida09 due to the lower threshold > > I now think it may be a hardware issue. Will look at the last file before the most recent powercycle. > > Using TD's analyser program can confirm the rate between aida09 and aida11 before 08:30 this morning was ~1:1. > The problem seems to have appeared during the power cycles following this. Encoding: HTML ELCode plain Suppress Email notification

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