Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Instrumentation X

HK 40.3: Talk

Wednesday, March 13, 2024, 16:15–16:30, HBR 19: C 2

Development of microchannel plate detectors for ion identifi- cation for slowed down beams at FAIR with minimal interac- tion with the beam — •Dennis Bittner¹, Gereon Hackenberg¹, Micheal Weinert¹, Micheal Armstrong², and Jan Jolie¹ — ¹University of Cologne, Institute for Nuclear Physics, Germany — ²GSI, Darmstadt, Germany

At FAIR/GSI ion beams have energies of hundreds of MeV/u. To per- form Coulomb excitation experiments the beam will be slowed down with a thick Degrader. Secondary reactions and scattering within the degrader result in a beam containing many secondary reaction products and a wide angular spread. For the experiments it is crucial to know the position, velocity, and direction of the single ions. The approach is to place two foil-MCP (micro channel plate) detectors with delay lines for position sensitivity in front of the experiment. The ions passing the foils generate secondary electrons, which are accelerated towards the MCP. Due to the great distance between the foil and the MCP, permanent magnets are used to force the electrons on circular trajecto- ries. This increases the resolution of the detectors. This talk discusses the ongoing development focusing on the positional resolution and sig- nal quality with a ³²S Beam at the IKP Cologne. Support by BMBF is acknowledged under ErUM Verbundprojekt 05P2021 (ErUM"-FSP T07) grant 05P21PKFN1.

Keywords: MCP; slowed down beam; detector development; FAIR