Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Instrumentation VIII and Accelerators

HK 34.3: Talk

Wednesday, March 29, 2017, 17:30–17:45, F 073

Concept and design of an alignment monitoring system for the CBM RICH mirrors* — •Jordan Bendarouach and Claudia Höhne for the CBM collaboration — Justus Liebig University, Gießen

The Compressed Baryonic Matter (CBM) experiment at the future FAIR complex will investigate the phase diagram of strongly interacting matter at high baryon density and moderate temperature in A+A collisions from 2-11 AGeV (SIS100).

One of the key detectors of CBM to explore this physics program is the RICH (Ring Imaging CHerenkov) detector, which is developed for efficient and clean electron identification and pion suppression. About 80 trapezoidal glass mirror tiles equally distributed in two half-spheres will serve as focusing elements with spectral reflectivity down to the UV range.

An important aspect to guarantee a stable operation of the RICH detector is the mirror alignment. To determine and quantify mirror misalignments, a method inspired from the HERA-B experiment is employed. The misalignment information is used in a correction cycle to allow a proper operation of the detector under these conditions.

First results of a study comparing the accuracy of the reconstruction method between inner and outer tiles will be presented. Results from an automated correction routine and the impact of the corrections on the matching efficiency will also be shown.

(*Supported by BMBF grants 05P15RGFCA, HIC for FAIR and HGS-HIRe)