Design considerations of the European DEMO's IR-interferometer/polarimeter based on TRAVIS simulations

Abstract

Interferometry is the primary density control diagnostic for large-scale fusion devices, including ITER and DEMO. In this paper we present a ray tracing simulation based on TRAVIS accounting for relativistic effects. The study shows that measurements will over-estimate the plasma density by as much as 20 degree. In addition, we present a measurement geometry, which will enable vertical position control during the plasma's ramp-up phase when gap-reflectometers and neutron cameras are still blind.

submitted to the JINST-proceedings of the International Conference on Diagnostics for Fusion Reactors 2021 in Varenna, 8 pages, 3 figures, this is the first revision