Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity: Cryodedetectors & Cryotechnique
TT 33.2: Vortrag
Dienstag, 8. März 2016, 14:15–14:30, H19
A 4k-pixel molecule camera for position and energy resolving detection of neutral molecular fragments — •Dennis Schulz1, Andreas Fleischmann1, Lisa Gamer1, Loredana Gastaldo1, Sebastian Kempf1, Claude Krantz2, Oldřich Novotný2, Andreas Wolf2, and Christian Enss1 — 1Kirchhoff Institute for Physics, Heidelberg — 2Max Planck Institute for Nuclear Physics, Heidelberg
Stored beams of molecular ions at kinetic energies of some tens or hundreds of keV are widely used in molecular collision physics, and a mass spectroscopic identification of fragmentation products is often a key requirement for unambiguous data interpretation. For the reconstruction of the kinematics of electron-ion collisions at the Cryogenic Storage Ring (CSR, MPIK Heidelberg) we developed MOCCA, a new large-area 4096-pixel detector based on magnetic micro-calorimeters. Here, the kinetic energy deposited by a fragmented reaction product in one of the pixels is a measure of its mass, as all fragments have roughly the speed of the initial molecular ion. This calorimetric approach allows for identification of all fragments, in particular including neutrals. MOCCA has an active area of 45mm x 45mm, which is segmented into 64 x 64 absorbers, each 700µm x 700µm in size.
We discuss design considerations and present micro-fabricated detectors. We discuss the results of first tests with x-ray photons, including the uniformity of the detector response, cross-talk, multi-hit capability and the energy resolution for photons and for the massive particles. Including all effects, we expect MOCCA to easily resolve mass differences down to 1u for molecules with a few hundred mass units at CSR.