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

C. Lau; E. H. Martin; S. Shiraiwa; G. M. Wallace

doi:10.1088/1741-4326/ab6481

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

C. Lau, E. H. Martin, S. Shiraiwa, G. M. Wallace

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

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. 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.

Original language	English
Article number	036001
Journal	Nuclear Fusion
Volume	60
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/ab6481
State	Published - 2020

Funding

This work was supported by US Department of Energy, Office of Science, Office of Fusion Energy Sciences under contract numbers DE-AC05-00OR22725 and DE-FC02-99ER54512. This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences under contract number DE-AC05-00OR22725. This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE)

Funders	Funder number
US Department of Energy
U.S. Department of Energy
Office of Science
Fusion Energy Sciences	DE-AC05-00OR22725, DE-FC02-99ER54512

Keywords

Alcator C-Mod
Current drive
Full-wave simulation
Lower hybrid
Scrape-off-layer
Tokamak

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1741-4326/ab6481

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

abstract = "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. 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.",

keywords = "Alcator C-Mod, Current drive, Full-wave simulation, Lower hybrid, Scrape-off-layer, Tokamak",

author = "C. Lau and Martin, {E. H.} and S. Shiraiwa and Wallace, {G. M.}",

note = "Publisher Copyright: {\textcopyright} 2020 IAEA, Vienna.",

year = "2020",

doi = "10.1088/1741-4326/ab6481",

language = "English",

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T1 - Full-wave model for the lower hybrid wave electric field vector with synthetic turbulence on Alcator C-Mod

AU - Lau, C.

AU - Martin, E. H.

AU - Shiraiwa, S.

AU - Wallace, G. M.

PY - 2020

Y1 - 2020

N2 - 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. 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.

AB - 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. 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.

KW - Alcator C-Mod

KW - Current drive

KW - Full-wave simulation

KW - Lower hybrid

KW - Scrape-off-layer

KW - Tokamak

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DO - 10.1088/1741-4326/ab6481

M3 - Article

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SN - 0029-5515

VL - 60

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

M1 - 036001

ER -

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

Abstract

Funding

Keywords

UN SDGs

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