ELOG DESPEC

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 11:30:01 2025
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> Summary of the day: > Small improvements were made throughout the day but by far the biggest change to the rate in the FEEs came from disabling the waveforms > This was done by setting ADC con > > Initial jumper configuration: > FEE LK > 1 2 4 > 2 1 2 4 > 3 2 3 4 > 4 2 4 > 5 2 4 > 6 1 2 4 > 7 2 3 4 > 8 1 2 4 > > 13:22 LK2, 3 and 4 on all p+n - attachment 1 > > 14:20 AC mains relay connected to AC voltage stabilisers + on separate mains socket from DESPEC - attachment 2 > Same configuration but waveforms disabled (p+n improvment) - attachment 3 > Layout 1 - attachment 4 > > 14:32 all FEE power cables moved to PSU 2 (Lower one in rack, upper one was slow to start for 1 FEE pair, likely the 5V slow to start) > Previously all FEEs on their own pair within a psu > New order 1,3 2,4 5,7 6,8 > Waveforms on - all bad - attachment 5 > Waveforms off - all p+n better - attachment 6 > > 14:54 interlock removed from AC mains relay > Also noticed adaptor board on 2 not in fully -> Now in > p+n generally better - attachment 7 > Without waveforms - p+n better again - attachment 8 > > 16:04 Platform moved into position > Interlock power cable removed from extension lead > w/ waveform - p+n slightly worse > w/o waveform - p+n same as beffore > > 16:14 LK3 removed from 1 and 5 > w/ waveform -> p+n slightly worse - attachment 9 > w/o waveform -> p+n best yet - attachment 10 > > 16:33 LK1 wasn't on all n+n was only on 2, 6 and 8 > Removed from 6 -> only one LK1 per DSSD > w/ waveforms - all bad - attachment 11 > w/o waveforms - no change - attachment 12 > > 16:59 LK1 removed from 2->4 This is the FEE with the BIAS braid > w/ waveform p+n better - attachment 13 > w/0 waveform p+n better, n+n worse? - attachment 14 > > 17:21 Bias filters added to n+n > w/ waveform - no change - attachment 15 > w/o wwaveofrm - P=n worse - attachment 16 > Stats 0x21 - attachment 17 > Stats 0x14 - attachment 18 > Stats 0x12 - attachment 19 > > 17:42 Bias filter removed and bias floated (LK1 removed) > w/ waveform all worse - attachment 20 > w/o waveform -> p+n worse, n+n similar > > 18:29 LK1 back on 4+8 > w/ waveform -> poor > w/0 waveform - recovered previous - attachment 20 > > > 18:32 LK 2 and 4 removed from 2 +6 > Also noticed ground lemo on aida02 not fully inserted which has been corrected > w/ waveform poor - attachment 21 > Threshold 0xF - attachment 22 > w/o waveform - attachment 23 Encoding: HTML ELCode plain Suppress Email notification

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