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 12:37:16 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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