SAMOP 2021 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: Poster

MS 3.2: Poster

Montag, 20. September 2021, 16:30–18:30, P

MOCCA: a 4k-pixel molecule camera for the position and energy resolved detection of neutral molecule fragments at the Cryogenic Storage Ring CSR — •Ansgar Lowack1, Dennis Schulz1, Steffen Allgeier1, Christian Enss1, Andreas Fleischmann1, Lisa Gamer2, Loredana Gastaldo1, Sebastian Kempf1, Oldrich Novotný2, and Andreas Wolf21Kirchhoff-Institute for Physics, Heidelberg University — 2Max-Planck-Institute for Nuclear Physics, Heidelberg

MOCCA is a 64 x 64-pixel detector based on metallic magnetic calorimeters (MMCs), enabling a spatially- and energy-resolved detection of neutral massive particles with keV kinetic energies on a detector area of 4.5 cm x 4.5 cm with 99.5% filling factor. MOCCA was developed for the investigation of dissociative recombination, a fundamental process in interstellar chemistry, at the Cryogenic Storage Ring CSR at the Max-Planck Institute for Nuclear Physics in Heidelberg. For this purpose, a high detection efficiency for molecule fragments with kinetic energies between 1 and 300 keV, rates up to several hundred hits per second and multi-hit capability are required. We present the detector design and recent measurements showing the full functionality of the detector. Measurements with 6 keV X-ray photons yielded an energy resolution of 88 eV (FWHM). With this, MOCCA meets all the requirements for its use at the CSR. MOCCA is presently the largest and most complex MMC-based detector.

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