Design considerations of the European DEMO's IR-interferometer/polarimeter based on TRAVIS simulations. (1st April 2022)

• Record Type: Journal Article
• Authors: Brunner, K.J.; Marushchenko, N.; Turkin, Y.; Biel, W.; Knauer, J.; Hirsch, M.; Wolf, R.C.
• Is Part Of: Journal of instrumentation. Volume 17:Number 4(2022)
• Publication Date: 2022-04-01
• Subjects: Plasma diagnostics — interferometry, spectroscopy and imaging -- Simulation methods and programs; Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/17/04/C04001
• Languages: English
• ISSNs: 1748-0221

Abstract

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°. 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.