Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 39: Precision spectroscopy of atoms and ions IV (with Q)
A 39.7: Vortrag
Freitag, 27. März 2015, 12:30–12:45, C/kHS
First measurements of Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy at GSI — •D. Hengstler1, M. Keller1, C. Schötz1, M. Krantz1, J. Geist1, T. Gassner2,3, K.H. Blumenhagen2,3, R. Märtin2,3, G. Weber2,3, S. Kempf1, L. Gastaldo1, A. Fleischmann1, Th. Stöhlker2,3,4, and C. Enss1 — 1KIP, Heidelberg University — 2Helmholtz-Institute Jena — 3GSI Darmstadt — 4IOQ, Jena University
Metallic magnetic calorimeters are particle detectors that provide a high energy resolution over a large energy range as well as an excellent linearity. They convert the energy of a single incoming photon into a temperature rise, leading to a change of magnetization in a paramagnetic Au:Er temperature sensor that is inductively read out by a SQUID magnetometer. Three different detector arrays, optimized for x-rays with energies up to 20, 30 and 200 keV respectively are presently developed as well as a compton polarimeter. With a detector optimized for 200 keV photons we performed two successful measurements at the Experimental Storage Ring at GSI. The detector was operated at T = 20mK and was attached to the tip of a 400 mm long and 80 mm wide cold finger of a cryogen free 3He/4He-dilution refrigerator. During the two beamtimes we achieved an energy resolution below 60 eV for photon energies up to 60 keV and investigated projectile beams of Au76+ and Xe54+ colliding with a Xe gas target, respectively. We were able to identify the Lyman series of Xe53+ up to Ly-η as well as spectral lines from He-like Xe and show that metallic magnetic Calorimeters will be a promising tool for future precision experiments at FAIR.