Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 34: Precision spectroscopy of atoms and ions IV (with A)
Q 34.7: Vortrag
Donnerstag, 20. März 2014, 12:00–12:15, BEBEL SR140/142
Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy — •D. Hengstler1, C. Schötz1, M. Krantz1, J. Geist1, S. Kempf1, L. Gastaldo1, A. Fleischmann1, C. Enss1, R. Märtin2, G. Weber2, T. Gassner2, and Th. Stöhlker2 — 1Kirchhoff-Institut, Uni Heidelberg — 2Helmholtz-Institut, Jena
We are presently commissioning maXs, an 8x8 detector array of metallic magnetic calorimeters for high resolution X-ray spectroscopy. The detector is operated at T = 20 mK and is attached to the tip of a 400 mm long and 80 mm wide cold finger of a cryogen-free 3He/4He-dilution refrigerator. Metallic magnetic calorimeters are particle detectors that convert the energy of a single incoming photon into a temperature rise, leading to a change of magnetization in an attached paramagnetic temperature sensor that is inductively read out by a SQUID magnetometer. Three different arrays, maXs-20, maXs-30 and maXs-200, optimized for X-rays with energies up to 20, 30 and 200 keV respectively, will be available. The cryogenic platform will also allow to operate polar-maXs, a novel high resolution Compton polarimeter which comprises active low-Z Compton scatterer surrounded by a belt of about 60 maXs-type detector pixels with high stopping power. In the ongoing commissioning phase single channel maXs-20 detectors achieved an energy resolution of 1.6 eV (FWHM) for 6 keV photons, which is unsurpassed by any other micro-calorimeter. The combination with the fast signal rise-time, the large dynamic range and the excellent linearity up to tens of keV of photon energy, will make maXs to a powerful spectrometer for a number of challenging experiments.