Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.2: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Metallic magnetic calorimeters for high resolution x-ray spectroscopy - Latest results from maXs-20 and maXs-200 — •Mathäus Krantz, Sönke Schäfer, Christian Pies, Daniel Hengstler, Simon Uhl, Sebastian Georgi, Sebastian Heuser, Thomas Wolf, Sebastian Kempf, Loredana Gastaldo, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Uni Heidelberg, INF 227, 69120 Heidelberg

We are developing metallic magnetic calorimeters (MMC) for high resolution x-ray spectroscopy on highly charged ions in the energy range up to 200keV. MMCs use a paramagnetic temperature sensor, read-out by a SQUID, to measure the energy deposited by single x-ray photons. The recently micro-fabricated and tested prototypes include two linear 8-pixel detector arrays, maXs-20 and maXs-200, optimized for energies up to 20 keV and 200 keV, respectively. We discuss the physics of MMCs, design considerations concerning thermal and electro-magnetic cross talk, and the micro-fabrication. maXs-200 with its 1mm² large and 200 µm thick absorbers made of electro-deposited gold has high stopping power for hard x-rays and achieves an energy resolution of 40-60 eV (FWHM). maXs-20 with its 250µm×250 µm large and 5 µm thick absorbers has a stopping power of 98% for 6 keV photons and presently achieves an experimental line width of 3,3 eV (FWHM), with a signal rise time of 90 ns and excellent linearity. We are presently operating maXs-20 at an electron-beam-ion-trap at the MPI-K Heidelberg and will report on first atomic physics measurements as well as the particular challenges to detector operation in the vicinity of the EBIT.