Difference between revisions of "PMT timing offsets"
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[[File:CF252TimingCalibration.png|650 px]] | [[File:CF252TimingCalibration.png|650 px]] | ||
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| + | Next, I take the difference between per pulse normalized TDC spectra of empty target runs and Al runs. Next, a single offset is applied to all detectors so that the photon peak lies at 4 ns - or the time it takes light to travel the distance from target to detector. | ||
Revision as of 23:32, 3 September 2017
The goal here is to set time offsets for all PMT's such that t=0 corresponds as closely as possible to the moment photons imping on the target.
First, I used the clean photon peak from a CF252 run to synchronize all the detectors. Here is what the timing spectra look like after these offsets are applied:
Next, I take the difference between per pulse normalized TDC spectra of empty target runs and Al runs. Next, a single offset is applied to all detectors so that the photon peak lies at 4 ns - or the time it takes light to travel the distance from target to detector.