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T: Fachverband Teilchenphysik
T 54: Axion like particles I
T 54.5: Vortrag
Mittwoch, 1. April 2020, 17:30–17:45, H-HS XV
A Ray Tracer for Axions at CAST — Klaus Desch1, •Johanna von Oy1, Jochen Kaminski1, Sebastian Schmidt1, Tobias Schiffer1, and Arshia Ruina2 — 1Physikalisches Institut, Uni Bonn — 2DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
The CAST (CERN Axion Solar Telescope) experiment has primarily been searching for solar axions and other dark matter candidates since 2003. In 2017 and 2018 data has been taken at CAST with an InGrid detector (a MicroMegas like gaseous detector) behind a purpose-built X-ray telescope. To calculate the expected flux arriving at the detector, a ray tracer has been developed.
In this case, the ray tracer tracks the path of thousands of axions from the sun, through the CAST magnet, where they are converted to X-ray photons. Those are then traced through the X-ray telescope to the detector.
It takes into account the production probability of axions for each radius of the sun and for each energy of the axion, which is calculated after choosing an axion model as well as a solar model. Following this, the path of the axion - and after conversion in the magnet, the photon - is constricted by the dimensions of the setup. Especially the Wolter I X-ray telescope is looked upon precisely as the reflection needs to be calculated and its transmission probability depends on the incoming angle and the energy of the X-ray.
The ray tracing of solar axions at CAST will be presented step by step.