Lower hybrid current drive in a tokamak for correlated passes through resonance
Name
21ja004_full.pdf
Size
1.56 MB
Format
Adobe PDF
Checksum (MD5)
092b7cf869782809a05c5f9c602c1354
Author(s)
Catto, Peter J.
Date Issued
February 2021
Journal
Journal of Plasma Physics
Publisher
Cambridge University Press
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.
Description
Submitted for publication in Journal of Plasma Physics
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1017/s0022377821000568
