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A: Fachverband Atomphysik
A 20: Poster: Precision spectroscopy of atoms and ions (with Q)
A 20.22: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
Metallic magnetic calorimeters for high resolution x-ray spectroscopy - Latest results from maXs-20 and maXs-200 — •Mathäus Krantz1, Sönke Schäfer1, Christian Pies1, Daniel Hengstler1, Simon Uhl1, Sebastian Heuser1, Thomas Wolf1, Loredana Gastaldo1, Christian Enss1, Andreas Fleischmann1, Sebastian Georgi2, Thomas M. Baumann2, and Jose R. Crespo Lopez-Urrutia2 — 1Kirchhoff-Institut für Physik, Uni Heidelberg, INF 227, 69120 Heidelberg — 2Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Deutschland
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 summarize the performance of both detector prototypes. 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.