Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.14: Poster

Thursday, April 2, 2020, 16:30–18:30, Zelt

A laser-system for field calibration studies of the Time Projection Chamber at the CBELSA/TAPS experiment — •Fabian Metzger, Dimitri Schaab, Markus Ball, and Bernhard Ketzer for the CBELSA/TAPS collaboration — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

The calibration of the electric field of a Time Projection Chamber (TPC) is of central importance since deviations from a homogeneous field in the drift region would otherwise lead to imprecise track reconstructions and detereorate the spatial resolution. For that reason, a proper correction is crucial for the detector performance.
For the CBELSA-TPC, a calibration system is planned, whose idea is adopted from the T2K experiment. Here, the calibration principle makes use of the photoelectric effect. With the help of laser light pulses which are coupled into the detector through optical fibre bundles, electrons are extracted from known positions on the cathode. The measurement of these electrons shows the integrated field distortions between anode and cathode.
The poster will present the optical setup with its components, a control system for the laser as well as the produced fibre profiles. Here, special attention is paid to a homogeneous illumination of the cathode.