Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 14: Poster Session - Atomic Physics II

A 14.21: Poster

Tuesday, March 10, 2020, 16:00–18:00, Empore Lichthof

Metallic Magnetic Calorimeters for High Precision X-Ray Spectroscopy on Highly Charged Ions — •M. Friedrich¹, S. Allgeier¹, M. Arndt¹, J. Geist¹, D. Hengstler¹, C. Schötz¹, S. Kempf¹, L. Gastaldo¹, A. Fleischmann¹, C. Enss¹, Ph. Pfäfflein², S. Trotsenko^2,3, T. Morgenroth³, M.O. Herdrich², G. Weber², R. Märtin², and Th. Stöhlker^2,3,4 — ¹KIP, Heidelberg University — ²HI Jena — ³GSI Darmstadt — ⁴IOQ, Jena University

Heavy Highly Charged Ions (HCIs) are promising candidates to test QED in extreme electromagnetic fields. Due to the high nuclear charge of such ions the electronic transitions are shifted to the X-ray regime, while the Lamb-Shift amounts to more than 0.1 % of the transition energies. Metallic magnetic calorimeters are energy dispersive X-ray detectors, which provide an extremely high energy resolution over a wide energy range as well as an excellent energy calibration. Thus, they are perfectly suited for high precision X-ray spectroscopy on HCIs in ion storage rings where photon flux is small and beam time is limited.
For an upcoming measurement on H-like U⁹¹⁺ at CRYRING@ESR we report on our newly developed, fabricated and characterised two-dimensional detector array maXs100 consisting of 64 pixels with a total detection area of 10x10 mm². An absorber thickness of 100 µ m (50 µ m) results in an expected energy resolution of Δ E_FWHM∼ 38 eV (27 eV). This detector is mounted on a side arm of a dilution refrigerator and will enable the determination of the 1s Lamb-Shift with sub-eV precision.