Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Instrumentation VI

HK 30.1: Group Report

Wednesday, April 1, 2020, 14:00–14:30, J-HS D

Status of the Barrel and Disc DIRC detectors at PANDA — •Merlin Böhm for the PANDA collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg

One of the main experiments at FAIR is PANDA, where high intensity antiprotons annihilate with protons in a momentum range of 1.5-15 GeV/c. For this experiment an excellent π/K separation with ≥ 3 σ is required. Two ring imaging Cherenkov detectors of the DIRC-type (Detection of Internally Reflected Cherenkov light) will be built. The Barrel DIRC surrounds the interaction region, covering polar angles from 22^∘ to 140^∘. The Endcap Disc DIRC (EDD) is placed in the forward beam direction and covers polar angles from 5^∘ to 22^∘. The Barrel DIRC is based on the BaBar and SuperB FDIRC designs with key improvements like lenses, prisms, and ultra-fast sensors, the EDD is a novel design. The radiators of both DIRCs are made from precisely polished fused silica glass to conserve the Cherenkov angle during many internal reflections and to maximize the photon transport efficiency. The photons are guided to readout planes by a lens and prism or by focusing elements and are detected by lifetime-enhanced MCP-PMTs, read out by FPGA-based TRB boards and TOFPET ASICs. This talk will give an overview of the designs, performance, and status of both DIRCs. The advanced and cost-optimized technical designs of the DIRCs are finalized and the TDRs are now completed. Mass production of components has been started for the Barrel DIRC, a first quadrant of the EDD will soon be under construction. - Funded by BMBF and GSI -