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Title: Simulation of the conditions of wave excitation for the optimization of the lower hybrid current drive in the Globus-M spherical tokamak

Abstract

At present, the method of current drive by means of lower hybrid waves is not applied to low-aspect-ratio tokamaks, because, in the traditional approach, it would be necessary to use waves with a very high slowing-down factor. However, studies of new transparency regions for waves in a nonuniform magnetized plasma, performed earlier at the Ioffe Physical Technical Institute, Russian Academy of Sciences, made it possible to develop an approach in which slow waves are excited in the poloidal (rather than toroidal) direction. In this approach, moderately slowed-down waves first propagate in the poloidal direction, but then turn in the toroidalal direction and get into the dense plasma. In this work, this approach is further developed using numerical methods. In particular, the influence of the density profile in the edge plasma on the efficiency of wave excitation for given antenna parameters is studied in detail.

Authors:
;  [1];  [2];  [1]
  1. Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation)
  2. St. Petersburg State Polytechnical University (Russian Federation)
Publication Date:
OSTI Identifier:
22156421
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 39; Journal Issue: 2; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; ASPECT RATIO; COMPUTERIZED SIMULATION; EFFICIENCY; EXCITATION; LOWER HYBRID CURRENT DRIVE; OPTIMIZATION; PLASMA; SLOWING-DOWN; SPHERICAL CONFIGURATION; TOKAMAK DEVICES

Citation Formats

Dyachenko, V. V., Irzak, M. A., Cherotchenko, E. D., and Shcherbinin, O. N. Simulation of the conditions of wave excitation for the optimization of the lower hybrid current drive in the Globus-M spherical tokamak. United States: N. p., 2013. Web. doi:10.1134/S1063780X13020013.
Dyachenko, V. V., Irzak, M. A., Cherotchenko, E. D., & Shcherbinin, O. N. Simulation of the conditions of wave excitation for the optimization of the lower hybrid current drive in the Globus-M spherical tokamak. United States. doi:10.1134/S1063780X13020013.
Dyachenko, V. V., Irzak, M. A., Cherotchenko, E. D., and Shcherbinin, O. N. Fri . "Simulation of the conditions of wave excitation for the optimization of the lower hybrid current drive in the Globus-M spherical tokamak". United States. doi:10.1134/S1063780X13020013.
@article{osti_22156421,
title = {Simulation of the conditions of wave excitation for the optimization of the lower hybrid current drive in the Globus-M spherical tokamak},
author = {Dyachenko, V. V. and Irzak, M. A. and Cherotchenko, E. D. and Shcherbinin, O. N.},
abstractNote = {At present, the method of current drive by means of lower hybrid waves is not applied to low-aspect-ratio tokamaks, because, in the traditional approach, it would be necessary to use waves with a very high slowing-down factor. However, studies of new transparency regions for waves in a nonuniform magnetized plasma, performed earlier at the Ioffe Physical Technical Institute, Russian Academy of Sciences, made it possible to develop an approach in which slow waves are excited in the poloidal (rather than toroidal) direction. In this approach, moderately slowed-down waves first propagate in the poloidal direction, but then turn in the toroidalal direction and get into the dense plasma. In this work, this approach is further developed using numerical methods. In particular, the influence of the density profile in the edge plasma on the efficiency of wave excitation for given antenna parameters is studied in detail.},
doi = {10.1134/S1063780X13020013},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 2,
volume = 39,
place = {United States},
year = {2013},
month = {2}
}