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T: Fachverband Teilchenphysik

T 28: Suche nach dunkler Materie II

T 28.3: Vortrag

Dienstag, 20. März 2018, 17:05–17:20, Philo-HS5

Solar axion search with a GridPix detector at CAST — •Sebastian Schmidt, Klaus Desch, Jochen Kaminski, and Tobias Schiffer — Physikalisches Institut, Universität Bonn

The CERN Axion Solar Telescope (CAST) is a helioscope experiment at CERN, searching for solar axions and chameleons. The inverse Primakoff effect is utilized to reconvert the particles into X-rays in the magnetic field of an LHC prototype dipole magnet.

A gaseous detector based on 7 GridPixes, a combination of a 256 × 256 pixel Timepix ASIC and an integrated MicroMegas stage on top, together with veto scintillators and an FADC, are utilized at CAST to provide an ultra low background detector.

The analysis framework, written in a combination of Nim and Python, will be discussed. The focus will be signal / background separation, using convolutional neural networks to maximize background suppression while retaining high signal efficiency.

Preliminary results of the 2017/18 data taking period will be presented.