Nonresonant current drive and helicity injection by radio-frequency waves

A. Fukuyama, K. Itoh, Sanae Itoh, K. Hamamatsu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Current drive via nonresonant interaction between radio-frequency (rf) waves and plasma is studied. The averaged force of rf waves acting on each species of a plasma can be divided into a resonant force and a nonresonant one. A part of the nonresonant force cannot be expressed by a gradient of a scalar potential and remains after integrating along the direction of the force. This force mainly acts as an internal force among plasma species and the net momentum input from the wave to the plasma is usually small. This process is not included in the conventional current drive schemes but is associated with the rf wave, helicity injection. Quantitative analysis using a one-dimensional kinetic wave code is applied to waves in the ion cyclotron range of frequencies and low-frequency Alfvén waves in a large tokamak. The driven current is estimated taking account of the effect of the toroidally trapped particles. The spatial profile of the forces acting on electrons and ions as well as the driven current are obtained. The parameter dependence of the current drive efficiency on the wave number, the plasma density, the temperature, and the toroidal magnetic field is compared with the estimate based on a local analysis.

Original languageEnglish
Pages (from-to)539-549
Number of pages11
JournalPhysics of Fluids B
Volume5
Issue number2
DOIs
Publication statusPublished - Jan 1 1993

Fingerprint

radio frequencies
injection
Plasmas
Ions
trapped particles
Plasma density
Cyclotrons
Beam plasma interactions
quantitative analysis
plasma density
cyclotrons
Momentum
ions
Magnetic fields
scalars
low frequencies
momentum
gradients
Kinetics
Electrons

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Nonresonant current drive and helicity injection by radio-frequency waves. / Fukuyama, A.; Itoh, K.; Itoh, Sanae; Hamamatsu, K.

In: Physics of Fluids B, Vol. 5, No. 2, 01.01.1993, p. 539-549.

Research output: Contribution to journalArticle

Fukuyama, A, Itoh, K, Itoh, S & Hamamatsu, K 1993, 'Nonresonant current drive and helicity injection by radio-frequency waves', Physics of Fluids B, vol. 5, no. 2, pp. 539-549. https://doi.org/10.1063/1.860539
Fukuyama, A. ; Itoh, K. ; Itoh, Sanae ; Hamamatsu, K. / Nonresonant current drive and helicity injection by radio-frequency waves. In: Physics of Fluids B. 1993 ; Vol. 5, No. 2. pp. 539-549.
@article{c8a3729a4f7c4ae09cb65b8232a3324a,
title = "Nonresonant current drive and helicity injection by radio-frequency waves",
abstract = "Current drive via nonresonant interaction between radio-frequency (rf) waves and plasma is studied. The averaged force of rf waves acting on each species of a plasma can be divided into a resonant force and a nonresonant one. A part of the nonresonant force cannot be expressed by a gradient of a scalar potential and remains after integrating along the direction of the force. This force mainly acts as an internal force among plasma species and the net momentum input from the wave to the plasma is usually small. This process is not included in the conventional current drive schemes but is associated with the rf wave, helicity injection. Quantitative analysis using a one-dimensional kinetic wave code is applied to waves in the ion cyclotron range of frequencies and low-frequency Alfv{\'e}n waves in a large tokamak. The driven current is estimated taking account of the effect of the toroidally trapped particles. The spatial profile of the forces acting on electrons and ions as well as the driven current are obtained. The parameter dependence of the current drive efficiency on the wave number, the plasma density, the temperature, and the toroidal magnetic field is compared with the estimate based on a local analysis.",
author = "A. Fukuyama and K. Itoh and Sanae Itoh and K. Hamamatsu",
year = "1993",
month = "1",
day = "1",
doi = "10.1063/1.860539",
language = "English",
volume = "5",
pages = "539--549",
journal = "Physics of Fluids B",
issn = "0899-8221",
publisher = "American Institute of Physics Publising LLC",
number = "2",

}

TY - JOUR

T1 - Nonresonant current drive and helicity injection by radio-frequency waves

AU - Fukuyama, A.

AU - Itoh, K.

AU - Itoh, Sanae

AU - Hamamatsu, K.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - Current drive via nonresonant interaction between radio-frequency (rf) waves and plasma is studied. The averaged force of rf waves acting on each species of a plasma can be divided into a resonant force and a nonresonant one. A part of the nonresonant force cannot be expressed by a gradient of a scalar potential and remains after integrating along the direction of the force. This force mainly acts as an internal force among plasma species and the net momentum input from the wave to the plasma is usually small. This process is not included in the conventional current drive schemes but is associated with the rf wave, helicity injection. Quantitative analysis using a one-dimensional kinetic wave code is applied to waves in the ion cyclotron range of frequencies and low-frequency Alfvén waves in a large tokamak. The driven current is estimated taking account of the effect of the toroidally trapped particles. The spatial profile of the forces acting on electrons and ions as well as the driven current are obtained. The parameter dependence of the current drive efficiency on the wave number, the plasma density, the temperature, and the toroidal magnetic field is compared with the estimate based on a local analysis.

AB - Current drive via nonresonant interaction between radio-frequency (rf) waves and plasma is studied. The averaged force of rf waves acting on each species of a plasma can be divided into a resonant force and a nonresonant one. A part of the nonresonant force cannot be expressed by a gradient of a scalar potential and remains after integrating along the direction of the force. This force mainly acts as an internal force among plasma species and the net momentum input from the wave to the plasma is usually small. This process is not included in the conventional current drive schemes but is associated with the rf wave, helicity injection. Quantitative analysis using a one-dimensional kinetic wave code is applied to waves in the ion cyclotron range of frequencies and low-frequency Alfvén waves in a large tokamak. The driven current is estimated taking account of the effect of the toroidally trapped particles. The spatial profile of the forces acting on electrons and ions as well as the driven current are obtained. The parameter dependence of the current drive efficiency on the wave number, the plasma density, the temperature, and the toroidal magnetic field is compared with the estimate based on a local analysis.

UR - http://www.scopus.com/inward/record.url?scp=4043093012&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4043093012&partnerID=8YFLogxK

U2 - 10.1063/1.860539

DO - 10.1063/1.860539

M3 - Article

AN - SCOPUS:4043093012

VL - 5

SP - 539

EP - 549

JO - Physics of Fluids B

JF - Physics of Fluids B

SN - 0899-8221

IS - 2

ER -