Study of turbulence-induced refraction of lower hybrid waves using synthetic scrape-off layer filaments

Biswas, Bodhi; Gyou Baek, Seung; Bonoli, Paul; Shiraiwa, Syun’ichi; Wallace, Gregory; White, Anne

doi:10.1088/1361-6587/abb0d5

Title: Study of turbulence-induced refraction of lower hybrid waves using synthetic scrape-off layer filaments

Journal Article · Fri Sep 25 00:00:00 EDT 2020 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/abb0d5· OSTI ID:1897073

^[1]; Gyou Baek, Seung ^[1]; Bonoli, Paul ^[1]; Shiraiwa, Syun’ichi ^[1]; Wallace, Gregory ^[1]; White, Anne ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, turbulence-induced refraction effects to lower hybrid (LH) wave propagation and current drive are studied using synthetic scrape-off layer (SOL) blob/filament fields. A synthetic 3D, field-following, blob turbulence model is implemented in the ray-tracing/Fokker-Planck (RTFP) codes GENRAY/CQL3D. In Alcator C-Mod, the blob field is shown to significantly affect LH ray-trajectories, leading to increased on-axis damping and smoother current profiles. This effect depends on the average blob size and amplitude. In addition, the diffusion of ray-trajectories in phase-space caused by turbulence increases the robustness of the RTFP model. A modified $$N_{||}$$ launch spectrum, acting as a proxy for parametric decay instability (PDI) effects, is included in simulations with the blob model. A synergy between the modified launch spectrum and turbulence-induced refraction results in synthetic hard x-ray profiles that agree with experiment. Lastly, the blob model is used to predict the effect of SOL turbulence on DIII-D high-field side (HFS) LH launch. Assuming low turbulence amplitude in the HFS SOL (~5%), turbulence-induced refraction is predicted to have little effect on current drive efficiency.

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Research Organization:: General Atomics, San Diego, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; SC0018090; SC0014264; FG02-91ER54109; FG02-91-ER54109

OSTI ID:: 1897073

Alternate ID(s):: OSTI ID: 1668429

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 62, Issue 11; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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