# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Low Temperature MMC-based X-ray Detectors for IAXO

Not scheduled
20m
Zoom

#### Zoom

Poster Searches for New Physics

### Speaker

Daniel Behrend-Uriarte (Heidelberg University)

### Description

The next generation helioscopes babyIAXO and IAXO will search for evidence of axion and axion-like particles (ALPs) produced in the interior of the Sun. A very promising candidate for the focal plane detectors are low temperature metallic magnetic calorimeters (MMCs). Combining good energy resolution and high quantum efficiency, MMC-based detectors would allow to investigate the solar axion spectrum and derive information on axion models by analyzing the resulting X-ray spectrum beyond discovery. We present our detector system composed of a detector module and an amplifier module, both mounted at the mixing chamber plate of a dilution refrigerator kept at about 10 mK. The detector module contains a 64-pixel chip featuring an absorber area of 1 cm$^2$ which was optimized to match the BabyIAXO X-ray optics. X-ray absorbers made out of 10 µm thick gold ensure a high stopping power for the complete energy range of interest while the expected FWHM energy resolution is around 10 eV. The detector signal is amplified with a two-stage SQUID readout circuit. The first stage is positioned directly next to the detector whereas the second stage is implemented with a dedicated amplifier module. Moreover, we discuss our strategies to reach a background level of 10$^{-7}$ keV$^{-1}$ s$^{-1}$ cm$^{-2}$ and show ideas of integrating the detector system in the IAXO helioscope mechanical structure.

Email daniel.behrend-uriarte@kip.uni-heidelberg.de IAXO Collaboration Daniel Behrend-Uriarte

### Primary authors

Daniel Behrend-Uriarte (Heidelberg University) Andreas Abeln (Heidelberg University) Andreas Fleischmann (Heidelberg University) Daniel Hengstler (Heidelberg University) Daniel Unger (Heidelberg University) Christian Enss (Heidelberg University) Loredana Gastaldo (Heidelberg University)