Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.28: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Low Temperature MMC Detector Arrays for IAXO — •Daniel Unger, Andreas Abeln, Christian Enss, Andreas Fleischmann, Loredana Gastaldo, and Daniel Hengstler — Kirchhoff Institute for Physics, Heidelberg University

The International Axion Observatory (IAXO) is searching for evidence of axions or axion-like particles generated in the Sun. A large magnet inside a helioscope pointing towards the Sun is used to generate the required magnetic field to convert solar axions into photons via the Primakoff effect. The expected photon spectrum considering only axion-photon coupling has a black body shape with its maximum at around 4 keV. Hence, X-ray detectors with high efficiency and low intrinsic background are necessary. Low temperature detectors based on metallic magnetic calorimeters (MMCs) fulfill these requirements.

We present the characterization of the first MMC detector setup developed for IAXO. This system consists of a two dimensional 64 pixel MMC array covering a detection area of 16 mm2. Together with the SQUIDs necessary for the readout, the detector is mounted on a structure designed to be suitable for even larger MMC arrays. The performance of the detector array was investigated over a period of two months and will be discussed in terms of energy resolution, stability over time and background rate. To cope for different X-ray optics, a larger array covering an area of 1 cm2 is at present under development.

The results, in particular the achieved low intrinsic background, demonstrate that two dimensional MMC arrays are a promising technology for IAXO.

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