AIDA
GELINA
BRIKEN
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ISOLDE
CIRCE
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EDI_PSA
179Ta
CARME
StellarModelling
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K40
AIDA
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Sat Mar 29 12:32:05 2025
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> > Version 8 firmware > > > > Analysing R37_* data files (see https://elog.ph.ed.ac.uk/AIDA/160) > > > > Usinmg MIDASsort, I generate a spectrum showing the time difference (10ns clock cycles) > > between sequential ADC data items. There is an offset of 1000. > > > > I observe peaks at 1000, 1200, 1400 etc - as expected > > > > I also observe peaks at +/-10 clock cycles relative to these main peaks - not expected > > > > I also observe some discrete intermediate peaks - not expected > > I have investigated this timing using a sort program and R37_0. > > If I only work with data from one module there is no problem. Peaks in the time difference spectrum are the > expected 200 apart. > > If I then include a second module's ADC data the time difference spectrum starts to look as the one Tom attached > but with a fixed 45 ticks offset from the '200' peaks. > > I conclude the spectra appearance is due to the 500KHz ASIC readout clocks not being synchronized between the > different FEE64 modules.
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