Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Instrumentation 11

HK 31.8: Talk

Tuesday, March 24, 2015, 18:45–19:00, M/HS2

Development of an alignment system for the CBM rich — Claudia Höhne, Tariq Mahmoud, and •Jordan Bendarouach 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 temperatures in A+A collisions from 4-35 AGeV.

One of the key detector components required for the CBM physics program is the RICH detector, which is developed for efficient and clean electron identification and pion suppression. Main detector components are a CO2 gaseous radiator, MAPMT or MCP photo-detectors and spherical glass mirror tiles, used 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 alignment and continuous monitor of the mirrors. CLAM (Continuous Line Alignment Monitoring), an alignment procedure developed by the COMPASS experiment, is planned to be used also for the RICH mirror system. A smaller-scale version has been implemented in the CBM RICH prototype detector and tested at the Cern PS/T9 beamline in November 2014.

Using a grid and target dots made of retro-reflective material, it is possible to align the mirrors and monitor their displacements over time by analyzing and applying mathematical calculations on photographic images of the grid and targets reflected on the mirrors. The concept, first data and results of image processing will be presented and discussed.