Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.66: Poster
Montag, 17. März 2025, 15:00–18:00, P4
MOCCA: A 4k-pixel Molecule Camera for the Position and Energy Resolved Detection of Neutral Molecule Fragments — •Abdullah Özkara1, Christian Enss1, Andreas Fleischmann1, Lisa Gamer2, Loredana Gastaldo1, Daniel Hengstler1, Christopher Jakob2, Daniel Kreuzberger1, Ansgar Lowack1, Oldřich Novotnỳ2, Andreas Reifenberger1, Dennis Schulz1, and Andreas Wolf2 — 1Kirchhoff Institute for Physics, Heidelberg University — 2Max Planck Institute for Nuclear Physics, Heidelberg
The MOCCA detector is a 4k-pixel high-resolution molecule camera based on metallic magnetic calorimeters and read-out with SQUIDs that is able to detect neutral molecule fragments with keV kinetic energies. It will be deployed at the Cryogenic Storage Ring CSR at the Max Planck Institute for Nuclear Physics in Heidelberg, a storage ring built to prepare and store molecular ions in their rotational and vibrational ground states, enabling studies on electron-ion interactions. To reconstruct the reaction kinematics, MOCCA measures the energy and position of the molecule fragments incidenting on the detector, even with multiple particles hitting the detector simultaneously.
For readout, the signals of the 64 pixels of each row are added up and a triggered pixel is identified by its unique signal decay time. Two pixel rows are connected to the same SQUID with opposite polarity. This allows the use of only 32 SQUID channels to read out all 4094 pixels of the detector. We present an improved readout scheme using an exponential decay time spacing. In addition, we compare simulations of this scheme to measured data.
Keywords: Metallic Magnetic Calorimeters; Mass spectroscopy; Microfabrication