SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 2: Precision spectroscopy of atoms and ions (joint session A/Q)
A 2.21: Poster
Montag, 20. September 2021, 16:30–18:30, P
maXs100: A 64-pixel Metallic Magnetic Calorimeter Array for the Spectroscopy of Highly-Charged Heavy Ions — •S. Allgeier1, M. Friedrich1, A. Gumberidze2, M.-O. Herdrich2,3,4, 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 Ch. Enss1 — 1KIP, Heidelberg University — 2GSI, 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 are operated at millikelvin temperatures and 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. For the investigation of electron transitions in U90+ at CRYRING@FAIR we developed the 2-dimensional maXs-100 detector array within the framework of the SPARC collaboration. It features 8x8 pixels with a detection area of 1 cm2 and 50 µm thick absorbers made of gold, resulting in a stopping power of 40 % at 100 keV. An energy resolution of 40 eV at 60 keV was demonstrated in co-added spectra. The non-linearity of the detector system including the read-out chain was shown to be in the range of 0.2 % @ 136 keV. We will discuss the cryogenic setup of the two detector systems used during the beam time in April 2021, as well as the properties of the maXs-100 detector array including a sub-eV absolute energy calibration.