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

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Entry time:	Sat Mar 29 11:27:24 2025
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> 09:59 Noticed that the right hand ribbon cable for aida07 was offset vertically by 1. i.e. Only 1 of the 2 rows of pins in. Unbiassed detectors and reconnected. > Rebiassed detectors - leakage current on DSSD2 increased to 9.96uA - Attachment 1 > > Power cycling FEEs > > Following restart the FEEs show some improvement in rates - attachment 2 > Rate spectra - attachment 3 > Still issues with aida11 in the rate spectra (Likely a misaligned ERNI connector) > > > > Pulser on rate spectra - attachment 4 > Pulser off rate spectra - attachment 5 > We can see that with the pulser on there are events in the channels in aida01 and aida11 > With the pulser off these channels disappear. > ERNI connector is then likely aligned the issue is more likely the DSSD ribbon cable is misaligned. > > Taking bias off to investigate. > > > 10:39 Could not observe anything out of alignement about either the connectors or the adaptor boards > Note that after pushing on the connector AIDA01 had largely recovered > > 13:30 Top of snout taken off while mounted in S4. It was observed that one of the ribbon cables for aida11 was off by 1 row. > This was corrected in situ and the snout was put back together and made light tight again. > Oddly leakage current still the same - DSSD2 has come down though - attachment 6 > FEEs powercycled for new tests > > Half the channels in aida11 had appeared again > Took apart once more and found the other header also off by one row which has been corrected > > FEEs powercycled for new test > > All of aida11 now showing - attachment 7 > Statistics at 0xa shown in attachment 8 > All p+n for DSSD1 are good (aida01, 03, 09, 10, 11 and 12) > p+n for DSSD2 are so so (aida05, 07, 13, 14, 15 and 16) > All n+n 2, 4, 6 and 8 are poor still > > > 14:50 p+n waveforms - attachment 9 > n+n waveforms - attachment 10 > > Current jumper configuration > LK1 (Bias ground) on FEEs 6 and 8 > LK2&4 on all p+n > LK3 on aida03 and aida07 (Bottom middle) > > 15:00 Investigated whether there was a light leak. Placed black material over snout. > Leakage on DSSD2 dropped to 5.6 - attachment 11 > There was a light leak > Stats have decreased slightly - attachment 12 > > 16:00 Move raspberry pis atop 5mm alminimum plate to keep away from FEE64 PSUs > No change > > 16:30 Remove pulser network from all FEEs > Rates get noticably worse in many FEEs... why? > Stats - attachment 13 > > Possible ideas include braid touching things it shouldn't (Adapter PCBs?) Encoding: HTML ELCode plain Suppress Email notification

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