Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 3: XUV/X-ray spectroscopy I
A 3.7: Vortrag
Montag, 6. März 2017, 16:15–16:30, N 2
State-of-the-art MMC detector arrays for X-ray spectroscopy — •D. Hengstler1, F. Mücke1, J. Geist1, M. Keller1, M. Krantz1, C. Schötz1, R. Pons1, S. Kempf1, L. Gastaldo1, A. Fleischmann1, C. Enss1, T. Gassner2,3, K.H. Blumenhagen2,3, R. Märtin2,3, G. Weber2,3, and Th. Stöhlker2,3,4 — 1KIP, Heidelberg University — 2Helmholtz-Institute Jena — 3GSI Darmstadt — 4IOQ, Jena University
Metallic magnetic calorimeters (MMCs) are energy dispersive X-ray detectors which provide a very good energy resolution over a large dynamic range combined with an excellent linearity. MMCs are operated at millikelvin temperatures and convert the energy of an incoming X-ray into a temperature rise which is monitored by a paramagnetic temperature sensor. The resulting change of sensor magnetization is read out by a SQUID and serves as a measure for the energy input. We developed several micro-fabricated one- and two-dimensional detector arrays optimized for energies up to 20, 30 and 200 keV providing energy resolutions as good as 1.6 eV, 7 eV and 26 eV, respectively. The detectors are operated in a mobile dilution refrigerator. We discuss the performance of our detectors and show results of our most recent 8x8 pixel detector array providing an active detection area of 4 mm x 4 mm. We present promising results of first beamline experiments at ESR@GSI showing that MMCs are an ideal tool for future precision experiments at FAIR as well as new detector designs optimized for upcoming beamtimes at Cryring@ESR.