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A: Fachverband Atomphysik

A 21: Poster: Precision spectroscopy of atoms and ions

A 21.21: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.V

maXs: Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy in Atomic Physics — •Christian Pies, Sönke Schäfer, Sebastian Kempf, Jan-Patrick Porst, Simon Uhl, Sebastian Heuser, Thomas Wolf, Loredana Gastaldo, Andreas Fleischmann, and Christian Enss — Kirchhoff Institut für Physik, INF 227, 69120 Heidelberg

Highly-charged ions are model systems for the investigation of quantum electrodynamical effects in strong electromagnetic fields.

We are developing x-ray detectors based on 1x8 arrays of Metallic Magnetic Calorimeters (MMCs) optimized for x-ray spectroscopy of highly-charged ions at GSI/FAIR and the EBIT facility at the MPI for Nuclear Physics in Heidelberg. One of the detector arrays (maXs-20) is designed to provide an energy resolution below 3 eV (FWHM) and sufficient stopping power for x-rays in the energy range up to 20 keV. The second device (maXs-200) is optimized for the detection of x-rays up to 200 keV and should yield an energy resolution below 30 eV (FWHM).

We present detector designs, outline the micro-fabrication process and discuss the results of characterization measurements with ⁵⁵Fe and ²⁴¹Am calibration sources including energy resolution, signal shape and cross-talk between adjacent detectors of both arrays.