Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 34: Axionen I

T 34.5: Talk

Tuesday, March 26, 2019, 17:00–17:15, S09

Preparation of a GridPix detector for solar axion search at IAXO — •Hendrik Schmick, Klaus Desch, Jochen Kaminski, Sebastian Schmidt, and Tobias Schiffer for the CAST collaboration — Physikalisches Institut, Universität Bonn

The International Axion Observatory (IAXO) is an experiment, currently in development, to search for solar axions. The inverse Primakoff effect is utilized to reconvert the particles into X-rays in a magnetic field.

To test and optimize detectors for IAXO we use the CERN Axion Solar Telescope (CAST). The current gaseous X-ray detector consists of 7 GridPixes, a Timepix ASIC and an integrated MicroMegas stage on top. Additionally the analogue signals induced on the grid of the central GridPix are decoupled and recorded with an FADC. Moreover, two veto scintillators are installed for further background rejection.

Primary object of the talk will be auxiliary detector components (FADC + scintillators). The connection between the FADC, the central GridPix and the scintillator signals will be explained and the ways to use this information to improve background rejection will be presented.

The results presented wil be based on the 2017/18 data taking period at CAST.