Ray-tracing analysis for cross-polarization scattering diagnostic on MAST-upgrade spherical tokamak

Hong, R.; Rhodes, T. L.; Wang, G.; Peebles, W. A.

doi:10.1063/5.0043600

Ray-tracing analysis for cross-polarization scattering diagnostic on MAST-upgrade spherical tokamak

Journal Article · Wed Jun 02 00:00:00 EDT 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0043600· OSTI ID:1785586

; Rhodes, T. L.; ; Peebles, W. A.

A combined Doppler backscattering/cross-polarization scattering (DBS/CPS) system is being deployed on MAST-U for simultaneous measurements of local density turbulence, turbulence flows, and magnetic turbulence. In this design, CPS shares the probing beam with the DBS and uses a separate parallel-viewing receiver system. In this study, we utilize a modified GENRAY 3D ray-tracing code to simulate the propagation of the probing and scattered beams. The contributions of different scattering locations along the entire beam trajectories are considered, and the corresponding local B̃ wavenumbers are estimated using the wavevector matching criterion. The wavenumber ranges of the local B̃ that are detectable to the CPS system are explored for simulated L- and H-mode plasmas.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0019005

OSTI ID:: 1785586

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 6 Vol. 92; ISSN 0034-6748

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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