Bootstrap Current by Localized Beat Wave Seeding

Mikko Alava, Seppo Karttunen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Neoclassical bootstrap currents with well controlled central seed current drive in Tokamak plasmas are investigated analytically and numerically. The analytical current scaling predicts a strong bootstrap effect in hot, high density plasmas. The Troyon limit and safety factor profiles in various small seed current cases are considered to find the optimal conditions for a large bootstrap amplification. The Troyon limited bootstrap current is very insensitive to the detailed form of the pressure profile and the beta-limit is determined by the plasma geometry alone. Regarding the current seeding, high frequency methods, like beat-waves, are proposed, which are ideal for the localized central current drive.
Original languageEnglish
Pages (from-to)1135-1148
JournalPlasma Physics and Controlled Fusion
Volume32
Issue number12
DOIs
Publication statusPublished - 1990
MoE publication typeA1 Journal article-refereed

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inoculation
Seed
synchronism
Plasmas
Plasma density
Safety factor
Amplification
Geometry
seeds
safety factors
profiles
plasma density
scaling
geometry

Cite this

Alava, Mikko ; Karttunen, Seppo. / Bootstrap Current by Localized Beat Wave Seeding. In: Plasma Physics and Controlled Fusion. 1990 ; Vol. 32, No. 12. pp. 1135-1148.
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Bootstrap Current by Localized Beat Wave Seeding. / Alava, Mikko; Karttunen, Seppo.

In: Plasma Physics and Controlled Fusion, Vol. 32, No. 12, 1990, p. 1135-1148.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Alava, Mikko

AU - Karttunen, Seppo

PY - 1990

Y1 - 1990

N2 - Neoclassical bootstrap currents with well controlled central seed current drive in Tokamak plasmas are investigated analytically and numerically. The analytical current scaling predicts a strong bootstrap effect in hot, high density plasmas. The Troyon limit and safety factor profiles in various small seed current cases are considered to find the optimal conditions for a large bootstrap amplification. The Troyon limited bootstrap current is very insensitive to the detailed form of the pressure profile and the beta-limit is determined by the plasma geometry alone. Regarding the current seeding, high frequency methods, like beat-waves, are proposed, which are ideal for the localized central current drive.

AB - Neoclassical bootstrap currents with well controlled central seed current drive in Tokamak plasmas are investigated analytically and numerically. The analytical current scaling predicts a strong bootstrap effect in hot, high density plasmas. The Troyon limit and safety factor profiles in various small seed current cases are considered to find the optimal conditions for a large bootstrap amplification. The Troyon limited bootstrap current is very insensitive to the detailed form of the pressure profile and the beta-limit is determined by the plasma geometry alone. Regarding the current seeding, high frequency methods, like beat-waves, are proposed, which are ideal for the localized central current drive.

U2 - 10.1088/0741-3335/32/12/003

DO - 10.1088/0741-3335/32/12/003

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SP - 1135

EP - 1148

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

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