Multiple bifurcation of the radial electric field structure induced by electrodes in tokamaks

N. Kasuya; K. Itoh; Y. Takase

doi:10.1088/0741-3335/44/5A/329

Multiple bifurcation of the radial electric field structure induced by electrodes in tokamaks

N. Kasuya, K. Itoh, Y. Takase

Research output: Contribution to journal › Conference article › peer-review

6 Citations (Scopus)

Abstract

An improved confinement state can be attained by imposing a radial electric field at the plasma edge. This is characterized by a change of the E_r structure. A charge conservation equation with a diffusion term has been solved to explain this mechanism. Various types of E_r structures with multiple peaks are allowed for the same boundary condition. The relationship between the voltage and the current is obtained by numerical calculation. Both stable and unstable regions exist in the stationary solutions and their boundary points are critical points for transition from one state to another. Multiple transitions and hysteresis are predicted. The magnitude of the collision frequency affects the existence of solutions with multiple peaks.

Original language	English
Article number	329
Pages (from-to)	A287-A292
Journal	Plasma Physics and Controlled Fusion
Volume	44
Issue number	5 A
DOIs	https://doi.org/10.1088/0741-3335/44/5A/329
Publication status	Published - May 2002
Externally published	Yes
Event	8th IAEA Technical Committee Meeting on H-Mode Physics and Transport Barriers - Toki, Japan Duration: Sept 5 2001 → Sept 7 2001

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/44/5A/329

Cite this

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title = "Multiple bifurcation of the radial electric field structure induced by electrodes in tokamaks",

abstract = "An improved confinement state can be attained by imposing a radial electric field at the plasma edge. This is characterized by a change of the Er structure. A charge conservation equation with a diffusion term has been solved to explain this mechanism. Various types of Er structures with multiple peaks are allowed for the same boundary condition. The relationship between the voltage and the current is obtained by numerical calculation. Both stable and unstable regions exist in the stationary solutions and their boundary points are critical points for transition from one state to another. Multiple transitions and hysteresis are predicted. The magnitude of the collision frequency affects the existence of solutions with multiple peaks.",

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T1 - Multiple bifurcation of the radial electric field structure induced by electrodes in tokamaks

AU - Kasuya, N.

AU - Itoh, K.

AU - Takase, Y.

PY - 2002/5

Y1 - 2002/5

N2 - An improved confinement state can be attained by imposing a radial electric field at the plasma edge. This is characterized by a change of the Er structure. A charge conservation equation with a diffusion term has been solved to explain this mechanism. Various types of Er structures with multiple peaks are allowed for the same boundary condition. The relationship between the voltage and the current is obtained by numerical calculation. Both stable and unstable regions exist in the stationary solutions and their boundary points are critical points for transition from one state to another. Multiple transitions and hysteresis are predicted. The magnitude of the collision frequency affects the existence of solutions with multiple peaks.

AB - An improved confinement state can be attained by imposing a radial electric field at the plasma edge. This is characterized by a change of the Er structure. A charge conservation equation with a diffusion term has been solved to explain this mechanism. Various types of Er structures with multiple peaks are allowed for the same boundary condition. The relationship between the voltage and the current is obtained by numerical calculation. Both stable and unstable regions exist in the stationary solutions and their boundary points are critical points for transition from one state to another. Multiple transitions and hysteresis are predicted. The magnitude of the collision frequency affects the existence of solutions with multiple peaks.

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DO - 10.1088/0741-3335/44/5A/329

M3 - Conference article

AN - SCOPUS:0036574356

SN - 0741-3335

VL - 44

SP - A287-A292

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 5 A

M1 - 329

T2 - 8th IAEA Technical Committee Meeting on H-Mode Physics and Transport Barriers

Y2 - 5 September 2001 through 7 September 2001

ER -

Multiple bifurcation of the radial electric field structure induced by electrodes in tokamaks

Abstract

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