U.S. Department of EnergyOffice of Scientific and Technical Information
Lower hybrid current drive in a tokamak for correlated passes through resonance
Abstract
Standard quasilinear descriptions are based on the constant magnetic field form of the quasilinear operator so improperly treat the trapped electron modifications associated with tokamak geometry. Moreover, successive poloidal transits of the Landau resonance during lower hybrid current drive in a tokamak are well correlated, and these geometrical details must be properly retained to account for the presence of trapped electrons that do not contribute to the driven current. The recently derived quasilinear operator in tokamak geometry accounts for these features and finds that the quasilinear diffusivity is proportional to a delta function with a transit or bounce averaged argument (rather than a local Landau resonance condition). The new quasilinear operator is combined with the Cordey (Nucl. Fusion, vol. 16, 1976, pp. 499–507) eigenfunctions to properly derive a rather simple and compact analytic expression for the trapped electron modifications to the driven lower hybrid current and the efficiency of the current drive.
- Authors:
-
- OSTI
- Publication Date:
- DOE Contract Number:
- FG02-91ER54109
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
- OSTI Identifier:
- 1888229
- DOI:
- https://doi.org/10.7910/DVN/H9X9M1
Citation Formats
Catto, Peter J. Lower hybrid current drive in a tokamak for correlated passes through resonance. United States: N. p., 2022.
Web. doi:10.7910/DVN/H9X9M1.
Catto, Peter J. Lower hybrid current drive in a tokamak for correlated passes through resonance. United States. doi:https://doi.org/10.7910/DVN/H9X9M1
Catto, Peter J. 2022.
"Lower hybrid current drive in a tokamak for correlated passes through resonance". United States. doi:https://doi.org/10.7910/DVN/H9X9M1. https://www.osti.gov/servlets/purl/1888229. Pub date:Fri Jun 10 00:00:00 EDT 2022
@article{osti_1888229,
title = {Lower hybrid current drive in a tokamak for correlated passes through resonance},
author = {Catto, Peter J.},
abstractNote = {Standard quasilinear descriptions are based on the constant magnetic field form of the quasilinear operator so improperly treat the trapped electron modifications associated with tokamak geometry. Moreover, successive poloidal transits of the Landau resonance during lower hybrid current drive in a tokamak are well correlated, and these geometrical details must be properly retained to account for the presence of trapped electrons that do not contribute to the driven current. The recently derived quasilinear operator in tokamak geometry accounts for these features and finds that the quasilinear diffusivity is proportional to a delta function with a transit or bounce averaged argument (rather than a local Landau resonance condition). The new quasilinear operator is combined with the Cordey (Nucl. Fusion, vol. 16, 1976, pp. 499–507) eigenfunctions to properly derive a rather simple and compact analytic expression for the trapped electron modifications to the driven lower hybrid current and the efficiency of the current drive.},
doi = {10.7910/DVN/H9X9M1},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 10 00:00:00 EDT 2022},
month = {Fri Jun 10 00:00:00 EDT 2022}
}