Aufbau eines ß -Messstandes zur Untersuchung von Strahlenschäden an Silizium -Sensoren

Henning Kröhnke
May 2012

Thesis Type:

As part of this thesis a probe station has been built, calibrated and the control and analysis software implemented to investigate the charge collection efficiency of pad sensors with signals of minimum ionizing particles (MIP). The absolute accuracy for the signal measurements is 0.4% and the noise of the readout electronics is about 600 e-. Measurements are performable up to a current of 100 µA in the temperature range from -20° C to +20° C. The temperature of the chuck is maintained stable within 0.01K.
The calibration of the probe station is done by two independent methods. For one method test signals are provided by a pulse generator, for the other method the 60 keV line of an 241Am source is used. Both calibrations agree within 0.7%.
A trigger-simulation for the used 90Sr source shows that the most probable value of the deposited energy in the sensor for triggered events differs only by 5% of the value given by ideal MIPs.
First results show the feasibility of measurements with unirradiated sensors and sensors
irradiated up to a neutron equivalent influence of 1·10 neq/cm² .

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