The effect of a radial electric field on ripple-trapped ions observed by neutral particle fluxes

Jukka Heikkinen, W. Herrmann, Taina Kurki-Suonio

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

The effect of a radial electric field on nonthermal ripple-trapped ions is investigated using toroidal Monte Carlo simulations for edge tokamak plasmas. The increase in the neutral particle flux from the ions trapped in local magnetic wells observed by the charge exchange (CX) detector at a low confinement to high confinement transition at ASDEX (Axially Symmetric Divertor Experiment). Upgrade tokamak [Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Lisbon (European Physical Society, Petit-Lancy, Switzerland, 1993), Vol. 17C, Part I, p. 267] is reproduced in the simulations by turning on a radial electric field near the plasma periphery. The poloidal and toroidal angles at which the CX detector signal is most sensitive to the radial electric field are determined. A fast response time of the signal in the range of 50–100 μs to the appearance of the electric field can be found in the simulations with a relatively large half-width of the negative electric field region.
Original languageEnglish
Pages (from-to)3655 - 3662
Number of pages8
JournalPhysics of Plasmas
Volume4
Issue number10
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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neutral particles
flux (rate)
ripples
electric fields
ions
controlled fusion
signal detectors
simulation
plasma physics
charge exchange
Switzerland
congressional reports
physics
detectors

Cite this

Heikkinen, Jukka ; Herrmann, W. ; Kurki-Suonio, Taina. / The effect of a radial electric field on ripple-trapped ions observed by neutral particle fluxes. In: Physics of Plasmas. 1997 ; Vol. 4, No. 10. pp. 3655 - 3662.
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abstract = "The effect of a radial electric field on nonthermal ripple-trapped ions is investigated using toroidal Monte Carlo simulations for edge tokamak plasmas. The increase in the neutral particle flux from the ions trapped in local magnetic wells observed by the charge exchange (CX) detector at a low confinement to high confinement transition at ASDEX (Axially Symmetric Divertor Experiment). Upgrade tokamak [Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Lisbon (European Physical Society, Petit-Lancy, Switzerland, 1993), Vol. 17C, Part I, p. 267] is reproduced in the simulations by turning on a radial electric field near the plasma periphery. The poloidal and toroidal angles at which the CX detector signal is most sensitive to the radial electric field are determined. A fast response time of the signal in the range of 50–100 μs to the appearance of the electric field can be found in the simulations with a relatively large half-width of the negative electric field region.",
author = "Jukka Heikkinen and W. Herrmann and Taina Kurki-Suonio",
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The effect of a radial electric field on ripple-trapped ions observed by neutral particle fluxes. / Heikkinen, Jukka; Herrmann, W.; Kurki-Suonio, Taina.

In: Physics of Plasmas, Vol. 4, No. 10, 1997, p. 3655 - 3662.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effect of a radial electric field on ripple-trapped ions observed by neutral particle fluxes

AU - Heikkinen, Jukka

AU - Herrmann, W.

AU - Kurki-Suonio, Taina

PY - 1997

Y1 - 1997

N2 - The effect of a radial electric field on nonthermal ripple-trapped ions is investigated using toroidal Monte Carlo simulations for edge tokamak plasmas. The increase in the neutral particle flux from the ions trapped in local magnetic wells observed by the charge exchange (CX) detector at a low confinement to high confinement transition at ASDEX (Axially Symmetric Divertor Experiment). Upgrade tokamak [Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Lisbon (European Physical Society, Petit-Lancy, Switzerland, 1993), Vol. 17C, Part I, p. 267] is reproduced in the simulations by turning on a radial electric field near the plasma periphery. The poloidal and toroidal angles at which the CX detector signal is most sensitive to the radial electric field are determined. A fast response time of the signal in the range of 50–100 μs to the appearance of the electric field can be found in the simulations with a relatively large half-width of the negative electric field region.

AB - The effect of a radial electric field on nonthermal ripple-trapped ions is investigated using toroidal Monte Carlo simulations for edge tokamak plasmas. The increase in the neutral particle flux from the ions trapped in local magnetic wells observed by the charge exchange (CX) detector at a low confinement to high confinement transition at ASDEX (Axially Symmetric Divertor Experiment). Upgrade tokamak [Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Lisbon (European Physical Society, Petit-Lancy, Switzerland, 1993), Vol. 17C, Part I, p. 267] is reproduced in the simulations by turning on a radial electric field near the plasma periphery. The poloidal and toroidal angles at which the CX detector signal is most sensitive to the radial electric field are determined. A fast response time of the signal in the range of 50–100 μs to the appearance of the electric field can be found in the simulations with a relatively large half-width of the negative electric field region.

U2 - 10.1063/1.872261

DO - 10.1063/1.872261

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VL - 4

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EP - 3662

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1527-2419

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ER -