A Classic Thesis Style - Johannes Gutenberg-Universität Mainz

ibliography 147
Figure 53 Predictions for the separated and total cross sections
in the Λ electroproduction channel from
the original K-Maid model 85
Figure 54 Q 2 distributions of σT + ɛσL 86
Figure 55 SiPM matrix 90
Figure 56 Experimental set-up for SiPM characterization 92
Figure 57 Charge spectrum obtained by UV laser excitation
of the scintillating fiber 93
Figure 58 Signal gain as a function of bias voltage 93
Figure 59 Modular plexiglas device used for measurements
of the SiPM/fiber performance 94
Figure 60 Measurement of light attenuation in a 2 × 2 mm 2 95
Figure 61 Fired pixels as a function of overvoltage 96
Figure 62 Measurement of the accidental coincidence rate
for a threshold of 1.5 pixels as a function of
overvoltage 97
Figure 63 Results of a Geant simulation for the average
energy deposition in the studied fiber as a function
of the energy threshold demanded in the
trigger detector 99
Figure 64 Numerical calculation of the accidental coincidence
rate vs. fiber thickness, for matching detector
area 100
Figure 65 Result of a numerical convolution of the propagation
time distribution and scintillator decay
curve 101
Figure 66 Result of the Monte Carlo simulation on detection
efficiency as a function of threshold level
and hit position 102
Figure 67 Experimental set-up for SiPM characterization 104
Figure 68 Experimental set-up for SiPM irradiation 105
Figure 69 ADC spectra for low amplitude signals from
green sensitive Photonique SiPM before and after
irradiation 106
Figure 70 ADC spectra for fixed laser intensity after irradiation
with 30.8, 77.0, 123, 185, 262 and 385 ×
10 8 electrons 107
Figure 71 Noise spectra of a green sensitive Photonique
SSPM-0701BG-TO18 device that was exposed
to background irradiation close to the beamline
during one week of normal beam operation
108
Figure 72 Noise spectra of blue sensitive Photonique SSPM-
0611B1MM devices before and after irradiation
close to the beam-line 108