Stabilization of collisionless trapped particle modes in tokamaks

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859435· OSTI ID:6503563

Dominguez, R R ^[1]

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1. General Atomics, San Diego, CA (USA)

A quadratic form is derived to study the stability of collisionless trapped particle modes in tokamaks. Marginal stability criteria show that stability can be obtained by controlling the electron temperature profile. In a low aspect ratio equilibrium (such as the recently proposed Comet (Comments Plasma Phys. {bold XII}, 125 (1989))), the stability requirement is {eta}{sub {ital e}}{congruent}{ital O}(1) ({eta}{sub {ital e}}={partial derivative} ln {ital T}{sub {ital e}}/{partial derivative} ln {ital n}{sub {ital e}}); in a standard large aspect ratio tokamak with a broad density profile, the requirement is {ital L}{sub {ital T}{sub {ital e}}}/{ital R}{congruent}{ital O}(1) ({ital L}{sup {minus}1}{sub {ital T}{sub {ital e}}}={minus}{partial derivative}ln {ital T}{sub {ital e}}/{partial derivative}{ital r}). Possible application of the second scenario to H-mode plasmas is noted.

• OSTI ID: 6503563
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:9; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ASPECT RATIO
CLOSED PLASMA DEVICES
COLLISIONLESS PLASMA
ELECTRON TEMPERATURE
EQUILIBRIUM
INSTABILITY
OPTIMIZATION
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
STABILIZATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRAPPED-PARTICLE INSTABILITY