Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Instrumentation X

HK 28.4: Talk

Tuesday, February 27, 2018, 17:15–17:30, HZO 90

Concept and design of an alignment monitoring system for the CBM RICH mirrors* — •Jordan Bendarouach for the CBM collaboration — II. physikalisches Institut, 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 temperatures in A+A collisions from 2-15 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.

A global correction cycle will be presented. Results from an automated correction routine and the impact of the corrections on the matching efficiency of the detector will be shown.

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