SMuK 2023 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Instrumentation XVII
HK 64.3: Talk
Thursday, March 23, 2023, 16:30–16:45, SCH/A.101
New planar GEM detectors for AMBER — •Jan Paschek1, Karl Flöthner1,3, Dimitri Schaab1, Christian Honisch1, Michael Lupberger1,2, Igor Konorov4, Christian Honisch1, Michael Hösgen1, and Bernhard Ketzer1 — 1Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — 2Universität Bonn, Physikalisches Institut, Bonn, Germany — 3CERN, Geneva, Switzerland — 4Technische Universität München, Physik-Department, Garching, Germany
As a follow-up experiment to COMPASS at the M2 beamline of the CERN SPS, AMBER (NA66) is expected to make important contributions to unresolved questions related to the structure and spectroscopy of light mesons. In addition, a precision measurement of the proton formfactor by elastic muon-proton scattering at very low 4-momentum transfer will be performed over the next two years.
New large-format triple GEM detectors have been designed and built for tracking charged particles in close proximity to the primary beam. They have shorter strips split in the middle to handle higher particle rates without having to disable the central region. We also eliminated the use of spacer grids to minimize dead zones. The first new detectors were installed and operated during the COMPASS beam period in 2022. For AMBER, the APV-based readout electronics will be replaced by a self-triggering front-end chip. In addition, a stabilized voltage divider will provide constant gain independent of particle rate.
The talk will give an overview of the construction and commissioning of the new detectors and show first results from their operation.