Monte Carlo simulation of minority ion bootstrap current by off-axis ion cyclotron heating in Tokamaks

Jukka Heikkinen, Seppo Sipilä

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The characteristics of the ion current driven by localized minority ion cyclotron heating in tokamaks in the presence of a well enhanced high energy tail are examined by fully toroidal Monte Carlo guiding centre simulations. The contribution of the diamagnetic current to the minority current drive has been found to be of importance as it dominates the resulting fast ion current in the presence of significant toroidal trapping of RF heated minority ions, and also because it is excited even with symmetric launching, thus requiring no directivity in the antenna system. The driven currents from the simulation are compared with a functional form approximating the trapped ion contribution to the minority ion diamagnetic current in the strong heating limit. The bidirectional current profile, the dependence on wave intensity and the increase of the current generation efficiency with electron temperature and with the inverse major radius as predicted by the Monte Carlo simulations are satisfactorily reproduced by the estimate
Original languageEnglish
Pages (from-to)835 - 849
Number of pages15
JournalNuclear Fusion
Volume37
Issue number6
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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minorities
ion currents
cyclotrons
heating
ions
simulation
launching
directivity
antennas
trapping
electron energy
radii
estimates
profiles
energy

Cite this

Heikkinen, Jukka ; Sipilä, Seppo. / Monte Carlo simulation of minority ion bootstrap current by off-axis ion cyclotron heating in Tokamaks. In: Nuclear Fusion. 1997 ; Vol. 37, No. 6. pp. 835 - 849.
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title = "Monte Carlo simulation of minority ion bootstrap current by off-axis ion cyclotron heating in Tokamaks",
abstract = "The characteristics of the ion current driven by localized minority ion cyclotron heating in tokamaks in the presence of a well enhanced high energy tail are examined by fully toroidal Monte Carlo guiding centre simulations. The contribution of the diamagnetic current to the minority current drive has been found to be of importance as it dominates the resulting fast ion current in the presence of significant toroidal trapping of RF heated minority ions, and also because it is excited even with symmetric launching, thus requiring no directivity in the antenna system. The driven currents from the simulation are compared with a functional form approximating the trapped ion contribution to the minority ion diamagnetic current in the strong heating limit. The bidirectional current profile, the dependence on wave intensity and the increase of the current generation efficiency with electron temperature and with the inverse major radius as predicted by the Monte Carlo simulations are satisfactorily reproduced by the estimate",
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Monte Carlo simulation of minority ion bootstrap current by off-axis ion cyclotron heating in Tokamaks. / Heikkinen, Jukka; Sipilä, Seppo.

In: Nuclear Fusion, Vol. 37, No. 6, 1997, p. 835 - 849.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Monte Carlo simulation of minority ion bootstrap current by off-axis ion cyclotron heating in Tokamaks

AU - Heikkinen, Jukka

AU - Sipilä, Seppo

N1 - Project code: ENE9606

PY - 1997

Y1 - 1997

N2 - The characteristics of the ion current driven by localized minority ion cyclotron heating in tokamaks in the presence of a well enhanced high energy tail are examined by fully toroidal Monte Carlo guiding centre simulations. The contribution of the diamagnetic current to the minority current drive has been found to be of importance as it dominates the resulting fast ion current in the presence of significant toroidal trapping of RF heated minority ions, and also because it is excited even with symmetric launching, thus requiring no directivity in the antenna system. The driven currents from the simulation are compared with a functional form approximating the trapped ion contribution to the minority ion diamagnetic current in the strong heating limit. The bidirectional current profile, the dependence on wave intensity and the increase of the current generation efficiency with electron temperature and with the inverse major radius as predicted by the Monte Carlo simulations are satisfactorily reproduced by the estimate

AB - The characteristics of the ion current driven by localized minority ion cyclotron heating in tokamaks in the presence of a well enhanced high energy tail are examined by fully toroidal Monte Carlo guiding centre simulations. The contribution of the diamagnetic current to the minority current drive has been found to be of importance as it dominates the resulting fast ion current in the presence of significant toroidal trapping of RF heated minority ions, and also because it is excited even with symmetric launching, thus requiring no directivity in the antenna system. The driven currents from the simulation are compared with a functional form approximating the trapped ion contribution to the minority ion diamagnetic current in the strong heating limit. The bidirectional current profile, the dependence on wave intensity and the increase of the current generation efficiency with electron temperature and with the inverse major radius as predicted by the Monte Carlo simulations are satisfactorily reproduced by the estimate

U2 - 10.1088/0029-5515/37/6/I10

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JF - Nuclear Fusion

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