Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Instrumentation XVIII

HK 61.7: Vortrag

Donnerstag, 17. März 2016, 18:15–18:30, S1/01 A2

A Photoelectric Effect based Field Calibration System for the Time Projection Chamber at the CBELSA/TAPS Experiment — •Dimitri Schaab, Markus Ball, Reinhard Beck, and Bernhard Ketzer for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Deutschland

One challenge of gaseous track detectors, such as the Time Projection Chamber (TPC), is the calibration of the electric field inside the sensitive volume. This is crucial since deviations from a perfectly homogeneous drift field deteriorates the performance of the TPC. Reasons for these deviations are, on the one hand, static imperfections of the detector structure and, on the other hand, dynamic changes of the space charge inside the sensitive volume. The dynamic space charge distortions are collision rate dependent and mainly related to the unwanted ion backflow from the amplification region near the readout plane. For the CBELSA TPC, a calibration system is planned which is based on the T2K calibration system. Here, electrons are released via the photoelectric effect at well-known positions on the cathode, which then drift towards the readout plane and show the integrated spatial distortions.
The concept of the calibration system as well as first results of a small prototype will be presented.
Supported by the Deutsche Forschungsgemeinschaft (SFB/TR16).