development of micro-pattern gaseous detectors – gem - LMU

38 Chapter 3 The Triple GEM Prototype 1.0
trigger line, i.e. the detector itself, is responsible for activating the readout electronics. Therefore a
software discrimination is reasonable and implemented in the analyzing algorithm. In a time frame of
about 400 ns before the signal rise and 1000 ns after the signal’s maximum, average values of the data
point in these frames and their standard deviations are calculated. The Fermi-function fit will only
be executed if the difference between the two average values is bigger than three times the maximal
standard deviation:
mean2 − mean1 > 3 · σmax −→ executing Fermi − fit (3.7)
Independent of the software cuts, all parameters of the fit function are filled in histograms for the
corresponding data samples and are the basis for the following analysis.