Single Photo-Electron EXtractor 2
SPEEX2 is a small utility projec to extract the single photoelectron (p.e.) spectrum from a multi-p.e. charge distribution taken by PMT or SiPM. The basic idea is based on the iteration method proposed by Takahashi et al. 2018 [1], but we also plan to add an improved method that takes into account the pedestal distribution more accurately.
As of Dec 2020, the program is written in C++ and ROOT, and only the original iteration method, which is not applicable when the pedestal is very dirty, is implemented.
[1] M. Takahashi, et al. (2018) NIMA 894 1–7, "A technique for estimating the absolute gain of a photomultiplier tube" https://dx.doi.org/10.1016/j.nima.2018.03.034
$ root
root [0] .L speex2.C+
root [1] auto anas = test()
Please read the test function to see how to use the SinglePEAnalyzer class.