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A: Fachverband Atomphysik
A 7: Precision spectroscopy of atoms and ions I
A 7.6: Vortrag
Montag, 9. März 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. Stöhlker2,3,4, 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.