Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 24: Gasgefüllte Detektoren 1 (gemeinsam mit HK)

T 24.5: Talk

Monday, March 27, 2017, 18:00–18:15, F 102

A Time Projection Chamber for the CBELSA/TAPS experiment — •Jonathan Ottnad, Markus Ball, Reinhard Beck, Dimitri Schaab, and Bernhard Ketzer — Helmholtz-Institut für Strahlen und Kernphysik, Bonn, DE

The CBELSA/TAPS experiment in Bonn aims to investigate the excitation spectrum of baryons and the properties of baryon resonances. Up to now, only the neutral decay products of the baryonic resonances are observed by the Crystal Barrel (CB), a high resolution electromagnetic calorimeter. A Time Projection Chamber (TPC) is foreseen to grant access to charged reaction channels in addition. Besides tracking, a TPC provides particle identification via the specific energy loss.

A TPC consists of a gas-filled, cylindrical volume with very low material-budget. The combination of electric and magnetic fields allows a three-dimensional track reconstruction. Constraints from the experimental setup limit the size of the fieldcage (length: 727.8 mm, outer diameter: 308 mm). The experiment’s fixed target geometry results in a strong forward boost of the reaction products. Therefore the readout-electronics can only be mounted on one side of the TPC, which means one HV-cathode and one segmented readout-anode. For the gaseous amplification stage Gas Electron Multipliers were chosen.

This talk will cover the implementation of a TPC at the CBELSA/TAPS experiment, the current status of the TPC-prototype and its connected soft- and hardware infrastructure, as well as the development of a field calibration system.

Supported by SFB/TR 16.