Full-wave model for the lower hybrid wave electric field vector with synthetic turbulence on Alcator C-Mod

Lau, Cornwall; Martin, Elijah H.; Shiraiwa, S.; Wallace, G. M.

doi:10.1088/1741-4326/ab6481

Title: Full-wave model for the lower hybrid wave electric field vector with synthetic turbulence on Alcator C-Mod

Journal Article · 20 January 2020 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab6481 · OSTI ID:1607069

^[1];

^[1]; Shiraiwa, S. ^[2]; Wallace, G. M. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)

The effects of synthetic turbulence on lower hybrid (LH) wave field magnitude and polarization are studied on Alcator C-Mod. Three synthetic turbulence models are evaluated to assess the impact of filaments, holes, and periodic fluctuations on the LH wave electric fields. For all three cases, the synthetic turbulence can greatly impact the LH wave magnitude and polarization. Back scattering, interference and edge/SOL absorption of the LH wave is observed. This impact is shown to depend on the wavelength and amplitude of the fluctuations. The strongest effect appears for fluctuations at high amplitudes and wavelengths comparable to the LH wavelength. This synthetic turbulence model can be used as inputs into a synthetic diagnostic to calculate the lower hybrid wave field magnitude and direction measured by dynamic Stark effect spectroscopy. It will be shown that fluctuations at these high amplitudes and wavelengths may explain the experimentally measured results. Here, the effect of fluctuations on modifying LH polarization are also shown to be anti-correlated with SOL power losses, similar to recently observed experimental trends on Alcator C-Mod. These SOL losses may have detrimental impact on LHCD efficiency.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FC02-99ER54512

OSTI ID:: 1607069

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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