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 11:31:28 2025
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I have an eight FEE64 system now in place on the LYCCA chamber with a PB-5 pulser going into the adapter cards test input. The test capacitor is 30pF. I was going to explore the effect of the thresholds on the pulser peak. I notice that the spectra look like those taken in RIKEN and not a single peak. In the 1GeV range I would interpret this as noise but since this is such a high energy i don't quite understand what is happening in the ASIC. I thought i would share it with you. PB-5 input to 50R is 10v with no attenuation. Signal height on the inline 'scope is +5.2v ASICs are set to "default" with 1GeV range and 3uS shaping time. Let me know if anything useful can be gleaned by more tests on LYCCA. Q = CV = 30pF * 5V = 150pC => ~ 3.42GeV => ADC channel ~ 27880 The spectra imply a positive test input. The spectra imply an inconsistency between the data supplied and the peak position. You display the spectra on a log scale ... so the majority of events are in the peak ... but why do some channels so a peak and others a peak plus a small number of higher amplitude/events? What ASIC settings are you using? What is the PB-5 frequency? ... PB-5 settings? Encoding: HTML ELCode plain Suppress Email notification

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