ELOG CARME

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

CARME

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Entry time:	Sat Aug 16 18:35:17 2025
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> > 15.40 DSSSD bias & leakage current OK - attachments 1-2 > log shows variations due to ambient temperature changes in CRYRING hall > > FEE64 temperatures OK - attachment 3 > > WR timestamps OK - attachment 4 > > System wide checks Ok except global clock (aida16) - attachments 5-6 > > ADC data item stats OK - attachment 7 > > per FEE64 Rate spectra - attachment 8 > > per FEE64 1.8.L spectra - attachments 9-10 > have not been cleared in some time probably - will zero histograms & stats for later review > > per FEE64 1.8.W spectra - 20us FSR - attachments 11-12 > > Merger, TapeServer etc - attachments 13-14 > data file G22-222/R51_15 > > Motion control - attachment 15 > > 16.01 all histograms & stats zero'd > > 16.43 online per DSSSD energy spectra - attachment 16 > > photographs of CRYRING beam & target diagnostics - attachments 17-22 > > 18.45 Left DSSSDs cycled to clear high rates (c. 250k/FEE64) aida01-aida04 per https://elog.ph.ed.ac.uk/CARME/603 > > 18.49 DAQ continues data file G22-201/R51_27 > > DSSSD bias & leakage current OK - attachment 23 > > FEE64 temperatures OK - attachment 24 > > ADC data item stats OK - attachment 25 > > per FEE64 Rate spectra - attachment 26 > > online per DSSSD energy spectra - attachment 27 > > 19.00 Beam less stable but most cycles 5e+7 or higher > Target peaking c. 1e12 dropping to c. 6e11 > > 19.09 CRYRING hall temperature increasing, DSSSD leakage current increasing - attachments 28-29 > > > 20.06 Beam less stable most cycles 1-2e+7 or higher > Target c. 1-2e12 > > 20.15 JM/CB advise changing Lakeshore 336 Temp Controller set point from 29k to 29.5K - done > Average pressure decreases but rapid variations still observed - see attachment 30 > > > 21.00 contacted HKR to improve beam stability - they were alreday working on it but did not know what was causing the problem - will contact on-call CRYRING expert > > cycled L DSSSD to reset rates > > 21,10 beam 0ff - DSSDs OUT > > Increased target temperature to 30K to solve instability that developed again up to E12 density range. > > > > > > Encoding: HTML ELCode plain Suppress Email notification

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