Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions (with Q)

A 30.3: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Metallic Magnetic Calorimeters for high resolution X-ray spectroscopy — •M. Krantz, D. Hengstler, C. Schötz, M. Keller, J. Geist, P. Schneider, S. Kempf, L. Gastaldo, A. Fleischmann, and C. Enss — KIP Heidelberg University.

We develop microfabricated, energy dispersive particle detector arrays based on metallic magnetic calorimeters (MMCs) for high resolution x-ray spectroscopy to challenge bound-state QED predictions. Our MMCs are usually operated below 30 mK and use a paramagnetic temperature sensor placed in a weak magnetic field, read-out by a SQUID, to measure the energy deposited by single X-ray photons. MMCs combine the properties of high energy resolution, high energy bandwidth and near perfect linearity in one detector. We discuss the microfabricated devices and performances of three different detector arrays. The maXs-20 is a 1x8 pixel linear array optimized for x-rays up 20 keV with an achieved energy resolution of 1.6 eV for 6 keV x-rays and experiments with maXs-20 at the MPI-K yielded new reference measurements of V-like and Ti-like tungsten. The maXs-200 is a 1x8 pixel linear array optimized for x-rays up 200 keV with an achieved energy resolution of 45 eV for 60 keV x-rays. We discuss sucessfully performed measurements at the Experimental Storage Ring (ESR) at GSI with the maXs-200. Our first 2d prototype with 8x8 pixels, maXs-30, is optimized for x-rays up to 30 keV with an estimated energy resolution below 6 eV.