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A: Fachverband Atomphysik
A 35: Poster: Precision spectroscopy of atoms and ions (with Q)
A 35.26: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy with Highly Charged Ions — •C. Schötz1, D. Hengstler1, M. Keller1, M. Krantz1, J. Geist1, T. Gassner2,3, K.H. Blumenhagen2,3, R. Märtin2,3, G. Weber2,3, S. Kempf1, L. Gastaldo1, A. Fleischmann1, Th. Stöhlker2,3,4, and C. Enss1 — 1KIP, Heidelberg University — 2Helmholtz-Institute Jena — 3GSI Darmstadt — 4IOQ, Jena University
Metallic magnetic calorimeters (MMCs) are energy dispersive particle detectors which have a high energy resolution over a wide energy range. They operate at milli-Kelvin temperatures and convert the energy of a single absorbed photon into a temperature rise, which lead to a magnetization change in an attached paramagnetic sensor. The magnatization change in the temperature sensor is inductively read out by a SQUID-magnetometer. We show our developed maXs-200 detector, a 1x8 array with 200 µm thick absorber and an active area of 8 mm2 that is optimized to measure X-rays up to 200 keV. The performance under ideal condition showed an energy resolution of 45 eV for 60 keV γ-photons of an 241Am calibration source. We discuss two different sucessfully performed measurements at the Experimental Storage Ring (ESR) at GSI with the maXs-200. The detector was mounted on the cold finger of a pulse tube cooled 3He/4He-dilution refrigerator. The achieved energy resolution in an energy range from 0 keV up to 60 keV was below 60 eV. In addition we show the simulation results of different designs of a compton polarimeter including the efficiency of the 90∘ scattered photons, wherein the maXs-200 is also involved.