Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.17: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy — •M. Krantz1, C. Schötz1, D. Hengstler1, J. Geist1, S. Kempf1, L. Gastaldo1, A. Fleischmann1, C. Enss1, R. Märtin2, G. Weber2, Th. Stöhlker2, and J. Crespo3 — 1Kirchhoff-Institut, Universität Heidelberg — 2Helmholtz-Institut, Jena — 3Max-Planck-Institute of Nuclear Physics, Heidelberg
We are developing metallic magnetic calorimeters (MMC) for x-ray spectroscopy on highly charged ions in the energy range up to 200 keV. MMCs use a paramagnetic temperature sensor, read-out by a SQUID, to measure the energy deposited by single x-ray photons. Recent prototypes include two linear 8-pixel detector arrays, maXs-20 and maXs-200, as well as a first 2-dimensional 8x8 array, maXs-30, optimized for energies up to 20, 200, and 30 keV, respectively. We discuss the physics of MMCs, design considerations concerning cross talk, the micro-fabrication and the performances of the three prototypes. maXs-200 with its 200 µm thick absorbers made of electro-deposited gold has high stopping power for hard x-rays and achieves an energy resolution of 40 eV (FWHM). maXs-20 with its 5 µm thick absorbers has excellent linearity and a stopping power of 98% for 6 keV photons and presently achieves an instrumental line width of 1.6 eV (FWHM), unsurpassed by any other micro-calorimeter. We have been operating maXs-20 at an EBIT at the MPI-K Heidelberg and prepare maXs-30 for measurements at the ESR (GSI). We will report on first atomic physics measurements as well as the particular challenges to detector operation in both experimental settings.