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maXs: Microcalorimeter Arrays for High-Resolution X-Ray Spectroscopy at GSI/FAIR

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Abstract

Highly-charged heavy ions like U91+ provide unique conditions for the investigation of relativistic and quantum electrodynamical effects in strong electromagnetic fields. We present two X-ray detectors developed for high-resolution spectroscopy on highly-charged heavy ions. Both detectors consist of metallic magnetic calorimeters (MMCs) forming linear eight-pixel arrays. The first detector, maXs-20, is developed for the detection of X-rays up to 20 keV with an energy resolution below 3 eV. The second device, maXs-200, is designed for X-ray energies up to 200 keV with an energy resolution of 40 eV. The results of characterization measurements of single detectors of both arrays will be shown and discussed. In both cases, the performance of the detectors agrees well with their design values. Furthermore, we present a prototype MMC for soft X-rays with improved magnetic flux coupling. In first characterization measurements the energy resolution of this device was 2.0 eV (FWHM) for X-rays up to 6 keV.

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Acknowledgements

The authors wish to thank T. Stöhlker, J. Crespo, I. Uschmann and E. Förster for their support and fruitful discussions. This work was supported by the BMBF grant 06 HD 9118I, the GSI R&D grant HDEnss, and the European Community Research Infrastructures under the FP7 Capacities Specific Programme, MICROKELVIN project number 228464.

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Pies, C., Schäfer, S., Heuser, S. et al. maXs: Microcalorimeter Arrays for High-Resolution X-Ray Spectroscopy at GSI/FAIR. J Low Temp Phys 167, 269–279 (2012). https://doi.org/10.1007/s10909-012-0557-z

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  • DOI: https://doi.org/10.1007/s10909-012-0557-z

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