Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Superconductivity: Poster Session

TT 19.52: Poster

Montag, 7. März 2016, 15:00–18:00, Poster D

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. We discuss the physics of MMCs, their microfabrication and the detector performances of three detector arrays together with the cryogenic setups used for their operation. Two of these arrays, maXs-20 and maXs-200, are linear 1x8 arrays optimized for x-rays with energies up to 20 and 200 keV respectively. maXs-20 achieved an energy resolution of 1.6 eV for 6 keV x-rays and maXs-200 achieved an energy resolution of 45 eV for 60 keV x-rays. Both detectors already allowed to investigate excellent physics in several labs around the world. The third detector, the maXs-30, is our first 2d 8x8 pixel array prototype with an active detection area of 16 mm² and is optimized for x-rays up to 30 keV with an expected energy resolution below 6 eV when operated at 10 mK in a cryogen free ³He/⁴He-dilution refrigerator at the tip of a 40 cm long cold finger.