Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 64: Gaseous detectors I

T 64.4: Vortrag

Mittwoch, 1. April 2020, 17:15–17:30, L-3.016

Development of a GridPix X-ray polarimeter — Klaus Desch, •Markus Gruber, Jochen Kaminski, and Leonie Richarz — Physikalisches Institut, Universität Bonn, Nußallee 12, 53115 Bonn

In our group there are several gaseous detectors in development based on a highly granular pixel ASIC (Timepix / Timepix3) and a MicroMegas gas amplification stage (InGrid). The MicroMegas is produced by photolithographic postprocessing techniques and can be aligned with the pixel structure so that one grid hole is directly above one pixel. The combination of the Timepix ASIC and the InGrid amplification stage is called "GridPix". The advantage of a GridPix is its high granularity combined with low noise which gives the possibility of high resolution tracking and single primary electron detection.

To build an X-ray polarimeter based on a GridPix one uses the correlation of the polarisation plane and the emission angle of photoelectrons. By tracking the photoelectrons with the GridPix with its high resolution one can identify the start and endpoints as well as the direction of the photoelectrons. It is also possible to resolve multiple scattering within the photoelectron track. By reconstruction of the emission angle one can reconstruct the polarisation plane of the incoming photons.

In this talk I will present the working principle of a GridPix X-ray polarimeter as well as measurements from recent testbeams at PETRA III and KARA. Furthermore I will give an outlook on our future plans for the development of such a detector.