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Development and characterization of two-dimensional metallic magnetic calorimeter arrays for the high-resolution X-ray spectroscopy

Hengstler, Daniel

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Abstract

In the framework of this thesis the new two-dimensional detector array maXs30 was developed, fabricated and characterized. It is optimized for high-resolution X-ray spectroscopy in the energy range up to 30 keV and consists of 8x8 individual metallic magnetic calorimeters. These detectors combine the good energy resolution of crystal spectrometers and the large energy bandwidth of semiconductor detectors and measure the energy of each absorbed photon by the resulting temperature change. This change is converted to a change of magnetization by the paramagnetic alloy Ag:Er, which is read out by sensitive SQUID magnetometers. The detector can be mounted on the side arm of a mobile dry dilution refrigerator and a new 32 channel acquisition system has been developed for this array. The intrinsic energy resolution of the maXs30 detector was measured to be 7.9 eV (FWHM) and a resolving power of almost 3000 was achieved for X-rays with an energy of 60 keV. The complete maXs system was successfully tested during several experiments at the heavy ion storage ring ESR at the GSI, where the Lyman series of Xe53+ and the Balmer series of U89+ were investigated.

Item Type: Dissertation
Supervisor: Enss, Prof. Dr. Christian
Date of thesis defense: 30 November 2017
Date Deposited: 19 Dec 2017 10:36
Date: 2017
Faculties / Institutes: The Faculty of Physics and Astronomy > Kirchhoff Institute for Physics
Subjects: 530 Physics
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