Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 107: Suche nach Dunkler Materie 3

T 107.9: Group Report

Tuesday, March 5, 2013, 18:45–19:05, HSZ-103

An InGrid based Detector for the CAST Experiment — •Christoph Krieger, Klaus Desch, Jochen Kaminski, and Michael Lupberger — Physikalisches Institut, Universität Bonn, Nußallee 12, 53115 Bonn

Micropattern gaseous detectors like Micromegas are used in many particle physics experiments. To make use of the high granularity of Micromegas one has to combine them with a readout structure of comparable granularity. One possibility for this is to produce a Micromegas structure directly on top of a highly granular and integrated pixel chip, e.g. the Timepix ASIC, by means of photolithographic postprocessing. Such an integrated Micromegas stage is called InGrid.

The CAST experiment (Cern Axion Solar Telescope) is searching for solar axions converting into X-ray photons inside a strong magnetic field. Since the expected event rate is very low, an X-ray detector which is able to efficiently differentiate X-ray photons from background events like cosmic ray tracks is necessary. The high resolution of InGrid detectors facilitates an eventshape analysis to improve the background reduction.

An InGrid based X-ray detector is being developed which shall replace one of the CAST detectors. With a prototype detector an energy resolution of 5.2% at 5.9 keV as well as a low background level could be achieved. In this talk recent results as well as the status of the developments will be presented.