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Effects of fast ions and an external inductive electric field on the neoclassical parallel flow, current, and rotation in general toroidal systems

Technical Report:

Abstract

Effects of external momentum sources, i.e., fast ions produced by the neutral beam injection and an external inductive electric field, on the neoclassical ion parallel flow, current, and rotation are analytically investigated for a simple plasma in general toroidal systems. It is shown that the contribution of the external sources to the ion parallel flow becomes large as the collision frequency of thermal ions increases because of the momentum conservation of Coulomb collisions and sharply decreasing viscosity coefficients, with collision frequency. As a result, the beam-driven parallel flow of thermal ions becomes comparable to that of electrons in the Pfirsh-Schluter collisionality regime, whereas in the 1/{mu} or banana regime it is smaller than that of electrons by the order of {radical}(m{sub e}/m{sub i}) (m{sub e} and m{sub i} are electron and ion masses). This beam-driven ion parallel flow can not produce a large beam-driven current because of the cancellation with electron parallel flow, but produces a large toroidal rotation of ions. As both electrons and ions approach the Pfirsh-Schluter collisionality regime the contribution of thermodynamical forces becomes negligibly small and the large toroidal rotation of ions is predominated by the beam-driven component in the non-axisymmetric configuration with large helical ripples.  More>>
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
NIFS-150
Reference Number:
SCA: 700380; PA: JPN-92:011122; SN: 93000918527
Resource Relation:
Other Information: PBD: May 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CLOSED PLASMA DEVICES; CHARGED-PARTICLE TRANSPORT; NON-INDUCTIVE CURRENT DRIVE; NEOCLASSICAL TRANSPORT THEORY; BEAM INJECTION HEATING; CURRENT-DRIVE HEATING; PFIRSCH-SCHLUETER REGIME; PLATEAU REGIME; BANANA REGIME; ROTATION; ROTATING PLASMA; MOMENTUM TRANSFER; ELECTRIC FIELDS; 700380; ELEMENTARY AND CLASSICAL PROCESSES IN PLASMAS
OSTI ID:
10111172
Research Organizations:
National Inst. for Fusion Science, Nagoya (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE93753201; TRN: JP9211122
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
26 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Nakajima, Noriyoshi, and Okamoto, Masao. Effects of fast ions and an external inductive electric field on the neoclassical parallel flow, current, and rotation in general toroidal systems. Japan: N. p., 1992. Web.
Nakajima, Noriyoshi, & Okamoto, Masao. Effects of fast ions and an external inductive electric field on the neoclassical parallel flow, current, and rotation in general toroidal systems. Japan.
Nakajima, Noriyoshi, and Okamoto, Masao. 1992. "Effects of fast ions and an external inductive electric field on the neoclassical parallel flow, current, and rotation in general toroidal systems." Japan.
@misc{etde_10111172,
title = {Effects of fast ions and an external inductive electric field on the neoclassical parallel flow, current, and rotation in general toroidal systems}
author = {Nakajima, Noriyoshi, and Okamoto, Masao}
abstractNote = {Effects of external momentum sources, i.e., fast ions produced by the neutral beam injection and an external inductive electric field, on the neoclassical ion parallel flow, current, and rotation are analytically investigated for a simple plasma in general toroidal systems. It is shown that the contribution of the external sources to the ion parallel flow becomes large as the collision frequency of thermal ions increases because of the momentum conservation of Coulomb collisions and sharply decreasing viscosity coefficients, with collision frequency. As a result, the beam-driven parallel flow of thermal ions becomes comparable to that of electrons in the Pfirsh-Schluter collisionality regime, whereas in the 1/{mu} or banana regime it is smaller than that of electrons by the order of {radical}(m{sub e}/m{sub i}) (m{sub e} and m{sub i} are electron and ion masses). This beam-driven ion parallel flow can not produce a large beam-driven current because of the cancellation with electron parallel flow, but produces a large toroidal rotation of ions. As both electrons and ions approach the Pfirsh-Schluter collisionality regime the contribution of thermodynamical forces becomes negligibly small and the large toroidal rotation of ions is predominated by the beam-driven component in the non-axisymmetric configuration with large helical ripples. (author).}
place = {Japan}
year = {1992}
month = {May}
}