Nonresonant current drive and helicity injection by radio-frequency waves

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860539· OSTI ID:6941099

Fukuyama, A ^[1]; Itoh, K; Itoh, S ^[2]; Hamamatsu, K ^[3]

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1. Faculty of Engineering, Okayama University, Okayama 700 (Japan)
2. National Institute for Fusion Science, Nagoya 464-01 (Japan)
3. Japan Atomic Energy Research Institute, Naka, Ibaraki 311-01 (Japan)

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 Alfven 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.

• OSTI ID: 6941099
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:2; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
ALFVEN WAVES
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
CYCLOTRON RESONANCE
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
HEATING
HELICITY
HYDROMAGNETIC WAVES
ION CYCLOTRON-RESONANCE
JOULE HEATING
PARTICLE PROPERTIES
PLASMA DENSITY
PLASMA HEATING
RADIATIONS
RADIOWAVE RADIATION
RESISTANCE HEATING
RESONANCE
THERMONUCLEAR DEVICES
TOKAMAK DEVICES