Abstract (eng)
The goal of this thesis is to study a triple-GEM detector with pure gases. An already existing detector was improved with new shielding for the electronics and another readout structure. We build a data acquisition system allowing analyzing events from the detector.
First measurements with an ArCO2 gas mixture and a Cs-137 source were used to test the stability of the detector over time and to optimize the voltage used between the GEM foils. The next step was to do multichannel measurements to compare different channels with each other.
The gain of the detector was determined by using a Fe-55 source, giving a total gain of about 10,000. After that, pure gases were measured, beginning with argon and neon, both of which were measured successfully.
As a final step, a first measurement with pure hydrogen could be realized, working with voltage differences of up to 450 V in between each GEM. A slightly lower gain as in ArCO2 under stable conditions was reached, leading to over 369,000 events in 4 channels over 2.5 hours. These data sets represent a valuable input for further design studies to build an active target GEM-TPC.