SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.28: Poster
Thursday, March 30, 2023, 15:00–18:00, P2/OG2
X-ray spectroscopy of U90+ ions with a 64-pixel metallic magnetic calorimeter array — •A. Orlow1, S. Allgeier1, A. Abeln1, A. Brunold1, M. Friedrich1, A. Gumberidze2, D. Hengstler1, F. M. Kröger2,3,4, P. Kuntz1, A. Fleischmann1, M. Lestinsky2, E. B. Menz2,3,4, Ph. Pfäfflein2,3,4, U. Spillmann2, B. Zhu4, G. Weber2,3,4, Th. Stöhlker2,3,4, and C. Enss1 — 1KIP, Heidelberg University — 2GSI/FAIR, Darmstadt — 3IOQ, Jena University — 4HI Jena
Metallic magnetic calorimeters (MMCs) are energy-dispersive X-ray detectors which provide an excellent energy resolution over a large dynamic range combined with a very good linearity. MMCs convert the energy of each incident photon into a temperature pulse which is measured by a paramagnetic temperature sensor. The resulting change of magnetisation is read out by a SQUID magnetometer.
To investigate electron transitions in U90+ at CRYRING@FAIR within the framework of the SPARC collaboration, we developed the 2-dimensional maXs-100 detector array. It features 8x8 pixels with a detection area of 1 cm2 and a stopping power of 40 % at 100 keV. Four on-chip thermometers allow to correct for temperature drifts and to achieve an energy resolution of 40 eV at 60 keV. We show preliminary X-ray spectra of the recent U90+ beamtime. Due to the small rate of emitted X-rays, a good supression of background radiation is mandatory, which was ensured by a coincidence measurement with a particle detector. To increase the stopping power to above 60 % at 100 keV we develop a new maXs-100 detector with 100 µm thick absorbers.