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TT: Fachverband Tiefe Temperaturen

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

TT 16.29: Poster

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

Large x-ray detector design for Baby-IAXO — •Andreas Abeln, Christian Enss, Andreas Fleischmann, Loredana Gastaldo, Daniel Hengstler, and Daniel Unger — Kirchhoff-Institute for Physics, Heidelberg University

Axions are promising candidates for cold Dark Matter as well as for solving the strong CP problem, their detection could shine light onto two important open questions in particle physics. The International AXion Observatory (IAXO) is an experiment designed for the validation of the existence of axion or axion-like particles (ALPs) produced in the Sun. IAXO is a fourth generation helioscope and will consist of a 20 m long magnet with field up to 6 T filling eight bores with diameter 60 cm. In this volume axion can be converted back to photons. Solar axions would produce a black body spectrum picking between 4 keV and 6 keV. The photons produced in the conversion volume are then focused onto high resolution and low background x-ray detectors. Metallic magnetic calorimeters (MMCs) have shown extremely good energy resolution and mainly unit quantum efficiency in the energy range of interest. First investigations have shown the possibility to reach very low level of undesired events.
We present the development of a new 2D MMC array characterized by 64 pixels covering an active surface of 1 cm². This absorber area perfectly contains the focal area of the x-ray optics foreseen to be used in Baby-IAXO, an intermediate stage of IAXO. The pixels are optimized to have high efficiency up to 10 keV. The expected energy resolution is 12 eV FWHM. We discuss the chip design and expected performance.