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T: Fachverband Teilchenphysik

T 57: Axionen II

T 57.6: Vortrag

Mittwoch, 27. März 2019, 17:20–17:35, S09

Development of GridPix detectors for IAXO at CAST — •Sebastian Schmidt, Klaus Desch, Jochen Kaminski, Tobias Schiffer, and Hendrik Schmick for the CAST collaboration — Physikalisches Institut, Universität Bonn

The International AXion Observatory (IAXO) is a next generation axion helioscope aiming for an order of magnitude improvement on the axion photon coupling g_aγ over the current best results by the CERN Axion Solar Telescope (CAST). Such helioscopes utilize the inverse Primakoff effect to reconvert solar axions (and potential other ALPs) into X-rays in their respective magnetic fields.

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 deployed at CAST to develop an ultra low background detector for IAXO.

The talk focuses on an overview of the data analysis framework for this detector, written in Nim. The likelihood based analysis for the GridPix data will be discussed and preliminary results of the achieved background rate with the 2017/18 data will be presented.