A high-k mm-wave scattering diagnostic for measuring binormal wavenumber electron scale turbulence on MAST-U

Speirs, D. C. and Ronald, K. and Phelps, A. D. R. and Vann, R. and Huggard, P. G. and Wang, H. and Hall-Chen, V. H. and Field, A.; (2022) A high-k mm-wave scattering diagnostic for measuring binormal wavenumber electron scale turbulence on MAST-U. In: 2022 15th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT). 2022 15th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT) . IEEE, NOR, pp. 1-2. ISBN 9781665493109 (https://doi.org/10.1109/ucmmt56896.2022.9994837)

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Abstract

We describe a high-k mm-wave scattering diagnostic for measuring binormal wavenumber electron scale turbulence on the MAST-U spherical tokamak. Gaussian wave optics and beam-tracing calculations are presented that show the predicted spatial and wavenumber resolution of the diagnostic along with the sensitivity of measurement. The proposed system will operate at a frequency of 376GHz and will facilitate adjustable localization of the turbulence measurement from the magnetic axis out to the plasma edge.