Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 7: Precision spectroscopy of atoms and ions I

A 7.6: Talk

Monday, March 9, 2020, 15:30–15:45, f107

maXs: micro-calorimeter arrays for high-resolution X-ray spectroscopy — •S. Allgeier¹, M. Arndt¹, M. Friedrich¹, J. Geist¹, C. Schötz¹, D. Hengstler¹, S. Kempf¹, L. Gastaldo¹, A. Fleischmann¹, C. Enss¹, R. Märtin², G. Weber², S. Trotsenko³, T. Morgenroth³, M.O. Herdrich², P. Pfäfflein², Th. Stöhlker^2,3,4, T. Schumm⁵, and S.P. Stellmer⁶ — ¹KIP, Heidelberg University — ²Helmholtz-Institute Jena — ³GSI Helmholtzzentrum für Schwerionenforschung — ⁴IOQ, Jena University — ⁵Vienna University of Technology — ⁶PI, Bonn University

Metallic magnetic calorimeters (MMCs) are energy dispersive particle detectors which provide an excelent energy resolution over a large energy range combined with a very good linearity. MMCs are operated at millikelvin temperatures and convert the energy of an incoming X-ray photon into a temperature pulse which is measured by a paramagnetic temperature sensor. The resulting change of sensor magnetization is read out by a highly sensitive SQUID magnetometer. We developed several two-dimensional detector arrays optimized for X-ray energies up to 20, 30, 100 and 200 keV respectivly. The micro-fabricated detectors are operated in a mobile dilution refrigerator. We discuss the performance of our detectors including a record breaking energy resolution of 9.8 eV @ 60 keV. With their performance MMCs have been used in various applications, including the measurement of the ²²⁹Th isomer energy and are an ideal tool for upcoming precision QED tests at CRYRING@GSI/FAIR.