Biswas, Bodhi orcid.org/0000-0001-7993-3732, Bonoli, Paul, Ram, Abhay et al. (1 more author) (2022) Spectral broadening from turbulence in multiscale lower hybrid current drive simulations. Nuclear Fusion. 016029. ISSN 1741-4326
Abstract
The scattering of lower hybrid (LH) waves due to scrape-off layer filaments is investigated. It is revealed that scattering can account for the LH spectral gap without any ad hoc modification to the wave-spectrum. This is shown using a multiscale simulation approach which allows, for the first time, the inclusion of full-wave scattering physics in ray-tracing/Fokker-Planck calculations. In this approach, full-wave scattering probabilities are calculated for a wave interacting with a statistical ensemble of filaments. These probabilities are coupled to ray-tracing equations using radiative transfer theory. This allows the modeling of scattering along the entire ray-trajectory, which can be important in the multi-pass regime. Simulations are conducted for LH current drive (LHCD) in Alcator C-Mod, resulting in excellent agreement with experimental current and hard x-ray profiles. A region in filament parameter space is identified in which the impact of scattering on LHCD is saturated. Such a state coincides with experimental LHCD measurements, suggesting saturation indeed occurs in C-Mod, and therefore the exact statistical properties of the filaments are not important.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Funding Information: This work was supported by US DoE under Contract Numbers: DE-SC0018090 supporting the RF-SciDAC 4 project, DE-SC0014264 supporting PSFC MFE projects, and DE-FC02-04ER54698 supporting DIII-D projects. The GENRAY/CQL3D simulations presented in this paper were performed on the MIT-PSFC partition of the Engaging cluster at the MGHPCC facility ( www.mghpcc.org ) which was funded by DoE Grant Number DE-FG02-91-ER54109. Publisher Copyright: © 2022 The Author(s). Published on behalf of IAEA by IOP Publishing Ltd. |
Keywords: | Alcator C-Mod,filament,LHCD,turbulence |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 10 Jan 2023 11:20 |
Last Modified: | 16 Oct 2024 18:58 |
Published Version: | https://doi.org/10.1088/1741-4326/aca6fb |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1741-4326/aca6fb |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:195090 |
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