Monte Carlo simulation of lower hybrid current drive in Tokamaks

Jukka Heikkinen, Seppo Sipilä

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

In this paper, we present a method for noninductive current drive studies based on three-dimensional simulation of test particle orbits. A Monte Carlo momentum diffusion operator is developed to model the wave-particle interaction. The scheme can be utilized in studies of current drive efficiency as well as in examining the current density profiles caused by waves with a finite parallel wave number spectrum and a nonuniform power deposition profile in a toroidal configuration space of arbitrary shape. Calculations performed with a uniform power deposition profile of lower hybrid waves for axisymmetric magnetic configurations having different aspect ratios and poloidal cross-section shape confirm the semianalytic estimates for the current drive efficiency based on the solutions of the flux surface averaged Fokker-Planck equation for configurations with circular poloidal cross section. The consequences of the combined effect of radial diffusion, magnetic trapping and radially nonhomogeneous power deposition and background plasma parameter profiles are investigated.
Original languageEnglish
Pages (from-to)260-266
Number of pages7
JournalIEEE Transactions on Plasma Science
Volume22
Issue number3
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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profiles
simulation
configurations
magnetic diffusion
wave-particle interactions
cross sections
Fokker-Planck equation
aspect ratio
trapping
current density
orbits
momentum
operators
estimates

Cite this

Heikkinen, Jukka ; Sipilä, Seppo. / Monte Carlo simulation of lower hybrid current drive in Tokamaks. In: IEEE Transactions on Plasma Science. 1994 ; Vol. 22, No. 3. pp. 260-266.
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Monte Carlo simulation of lower hybrid current drive in Tokamaks. / Heikkinen, Jukka; Sipilä, Seppo.

In: IEEE Transactions on Plasma Science, Vol. 22, No. 3, 1994, p. 260-266.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Monte Carlo simulation of lower hybrid current drive in Tokamaks

AU - Heikkinen, Jukka

AU - Sipilä, Seppo

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N2 - In this paper, we present a method for noninductive current drive studies based on three-dimensional simulation of test particle orbits. A Monte Carlo momentum diffusion operator is developed to model the wave-particle interaction. The scheme can be utilized in studies of current drive efficiency as well as in examining the current density profiles caused by waves with a finite parallel wave number spectrum and a nonuniform power deposition profile in a toroidal configuration space of arbitrary shape. Calculations performed with a uniform power deposition profile of lower hybrid waves for axisymmetric magnetic configurations having different aspect ratios and poloidal cross-section shape confirm the semianalytic estimates for the current drive efficiency based on the solutions of the flux surface averaged Fokker-Planck equation for configurations with circular poloidal cross section. The consequences of the combined effect of radial diffusion, magnetic trapping and radially nonhomogeneous power deposition and background plasma parameter profiles are investigated.

AB - In this paper, we present a method for noninductive current drive studies based on three-dimensional simulation of test particle orbits. A Monte Carlo momentum diffusion operator is developed to model the wave-particle interaction. The scheme can be utilized in studies of current drive efficiency as well as in examining the current density profiles caused by waves with a finite parallel wave number spectrum and a nonuniform power deposition profile in a toroidal configuration space of arbitrary shape. Calculations performed with a uniform power deposition profile of lower hybrid waves for axisymmetric magnetic configurations having different aspect ratios and poloidal cross-section shape confirm the semianalytic estimates for the current drive efficiency based on the solutions of the flux surface averaged Fokker-Planck equation for configurations with circular poloidal cross section. The consequences of the combined effect of radial diffusion, magnetic trapping and radially nonhomogeneous power deposition and background plasma parameter profiles are investigated.

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