Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Instrumentation VI

HK 30.6: Vortrag

Mittwoch, 1. April 2020, 15:30–15:45, J-HS D

Development of a Ronchi Test at the CBM-RICH Mirrors — •Cornelius Feier-Riesen1 and Semen Lebedev2 for the CBM collaboration — 1Justus-Liebig-Universität Gießen — 2GSI Darmstadt

The CBM (Compressed Baryonic Matter) experiment is designed to explore the QCD Phase Diagram at moderate temperatures and high net-baryon densities. CBM will be located at the future FAIR facility in Darmstadt/Germany. The detector is designed to record, trigger and analyze reaction rates up to 10 MHz for p+p, p+A and A+A collisions.

The CBM RICH (Ring Imaging Cherenkov) detector will distinguish pions from electrons. The conically emitted Cherenkov photons are reflected by the CBM RICH mirrors onto the photon detector plane. The RICH has two spherical mirror planes, each mirror plane consisting of 40 (5 * 8) single squared mirror tiles. Since the photon yield is very small it is of great importance to ensure that the mirrors will map the photons with very high accuracy onto the PMT plane.

In this talk, the development of a Ronchi test for the CBM RICH mirrors will be presented. This test determines the local geometry of the surface, more precisely its deviation from an ideal sphere.

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