Mainz 2014 – scientific programme
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T: Fachverband Teilchenphysik
T 22: Detektorsysteme 1
T 22.1: Group Report
Monday, March 24, 2014, 11:00–11:20, GFH 01-721
Towards an InGrid based low energy X-ray 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) searches for solar axions and other new particles converting into X-ray photons inside a strong magnetic field. In order to enhance the sensitivity for physics beyond the standard model an efficient background discrimination as well as a detection threshold below 1 keV are required.
Featuring a high resolution combined with the capability to detect single electrons makes an InGrid based X-ray Detector an ideal candidate for a future CAST detector.
To provide proof of the low detection threshold an InGrid based detector has been tested in the CAST Detector Lab which provides an X-ray generator for energies down to a few hundred eV. In this talk results from these tests demonstrating the capability to detect the carbon Kα line at 277 eV will be presented as well as an overview over the developments towards an operation at CAST.