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The effectiveness of the V1 peak finder and a square peak finder for sparse photon events are compared below. The square peak finder finds pixels above a specific threshold which are contained within a 2x2 area allowing for 1, 2, 3 or 4 pixel photons then the rest of the remaining square is included which contributes the most to the photon energy. This makes the assumption that photon create square peaks on detectors.
The data from experiment xcs06016 and run 37 were used in this analysis. Only sparse events were used so multiple photon peaks or pixels shared by multiple photons are extremely rare; events with less than 3000 peaks found by each peak finder were used. A total of 13 events were used. The distribution of events for each peak finder is shown below.
One can see that the peaks roughly follow a Gaussian distribution but on the higher end, there is a very noticeable shoulder. At first, it appears to be a result of dense photons, a situation that was avoided. With the use of sparse events.
Just to confirm the suspicions, the sparsest event, event 634, was looked at separately. The V1 and square peak finders found only 545 and 584 peaks, respectively. It can be seen in the energy distribution of the peaks for event 634 that the high energy shoulder is still present so it cannot be due to multiple photon complications. Furthermore, by manually checking peaks, it can be seen that the high energy peaks do not neighbor other peaks and are merely just higher energy peaks.
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