Qweak Inelastic FFTfile PMTLED

An attempt to use Richard Jone's FFT algorithm to filter out helicity events.

Below is a histogram of an LED shining onto a PMT in Qweak. Notice the multiple peaks in the asymmetry distribution.

Using Richard's FFT code

File:FFTseries.cc RJ.txt

and the root commands

.L FFTseries.cc 
TH1* fft=FFTseries(Mps_Tree,"qwk_pmtled","hw_sum");

The following frequencies appear at 10,60,120,180, 240, 300