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 12:28:51 2025
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> 10:48 Adapter boards replaced for DSSD 1 &2 (FEEs 1,2,22 and 21) > Previous boards were Rev D new boards are Rev E > > System wide checks ok > FEE Temperatures ok - Attachment 1 > > 10:54 DSSDs biased up. Note that after new boards installed DSSD 1 and 2 had leakage currents of around 9uA > during ramp up > Leakage currents appear to have dropped as they reach 100V set point > T = 23.8 H = 45% D.P = +11.1 > Leakage and Bias ok - Attachment 2 > > 11:11 Waveforms for FEEs 22, 21, 11 and 13 - Attachments 3 - 10 > Statistics - Attachment 11 > > 14:00 System wide checks all ok > Leakage and bias ok - Attachment 12 > FEE temperatures ok - Attachment 13 > > 14:26 Spectra comparing the values for nnaida waveforms for different Ibias LF Feedback values > Values are indicated in image title. If not mentioned value 0x8 - Attachments 14 - 23 > > 14:37 Spectra showing the effect of different slow comparator values on the sawtooth signal in the waveforms > Spectra are all nnaida22 and slow comparator values in image titles - Attachments 24 - 26 > > Attachment FEE Change > 14 1 default > 15 1 LF 0xf > 16 2 default > 17 2 LF 0xf > 18 2 LF 0xc > 19 21 default > 20 21 default > 21 21 LF 0xf > 22 22 default > 23 22 LF 0xf > 24 22 LF 0xf SC 0xf > 25 22 LF 0xf SC 0xd > 26 22 LF 0xf SC 0xb > > 15:09 Raised slow comparator threshold to 0x40 ~ 640keV for all FEEs and all ASICs > Hit pattern in attachment 27 > Statistics - Attachment 28 > > New adapter boards appear to have improved the amount of white noise at default ASIC settings > This is shown with the decrease in statistics and also in the waveforms. > At default settings the saw tooth patterns still appear in the waveforms though attenuated > with lower frequencies and lower amplitudes. > Further improvements can be gained in reducing the amplitude and frequency of the saw tooth > patterns by changing the Ibias LF feedback value though care has to be taken that the pre-amp > signal is not taken to the rails. Hence FEE 2 has a value of 0xc rather than 0xf like the others. > Hit pattern checked for the pulser by raising the slow comparator threshold to 640keV. The boards that > have been changed show a much more believable rate than those that haven't which are still showing > higher than pulser rates. > > 16:09 The effect of changing the shaping time on the pulser widths was checked. > Optimum still appears to be at around 8us > > 16:50 DAQ started writing to Oct17/R5 @ 8Mb/s > nnaida 13 SC threshold at 0x20 > System wide checks ok > Leakage and bias ok - Attachment 29 > FEE Temp ok - Attachment 30 > Statistics - Attachment 31 Encoding: HTML ELCode plain Suppress Email notification

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