Generation of hot spots by fast electrons in lower hybrid grills

Karin Rantamäki; Timo Pättikangas; Seppo Karttunen; X. Litaudon; D. Moreau; X Litaudon; D Moreau

doi:10.1063/1.872940

Generation of hot spots by fast electrons in lower hybrid grills

Karin Rantamäki, Timo Pättikangas, Seppo Karttunen, X. Litaudon, D. Moreau, X Litaudon, D Moreau

Research output: Contribution to journal › Article › Scientific › peer-review

12 Citations (Scopus)

Abstract

Generation of hot spots on plasma facing components magnetically connected to the grill is a main limiting factor in high-power operation of a lower hybrid system. A possible explanation for the hot spots is the sputtering caused by fast electrons generated by parasitic absorption of lower hybrid power near the grill mouth.
The behavior of the edge plasma near the grill mouth is investigated with a new tool in this context: the self-consistent particle-in-cell (PIC) code XPDP2 [V. Vahedi et al., Phys. Fluids B 5, 2719 (1993)].
The PIC simulations provide the key parameters of the problem: the absorbed power, the radial deposition profiles, and the energy spectrum of the accelerated particles close to the grill.

Original language	English
Pages (from-to)	2553-2559
Journal	Physics of Plasmas
Volume	5
Issue number	7
DOIs	https://doi.org/10.1063/1.872940
Publication status	Published - 1998
MoE publication type	A1 Journal article-refereed

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title = "Generation of hot spots by fast electrons in lower hybrid grills",

abstract = "Generation of hot spots on plasma facing components magnetically connected to the grill is a main limiting factor in high-power operation of a lower hybrid system. A possible explanation for the hot spots is the sputtering caused by fast electrons generated by parasitic absorption of lower hybrid power near the grill mouth. The behavior of the edge plasma near the grill mouth is investigated with a new tool in this context: the self-consistent particle-in-cell (PIC) code XPDP2 [V. Vahedi et al., Phys. Fluids B 5, 2719 (1993)]. The PIC simulations provide the key parameters of the problem: the absorbed power, the radial deposition profiles, and the energy spectrum of the accelerated particles close to the grill.",

author = "Karin Rantam{\"a}ki and Timo P{\"a}ttikangas and Seppo Karttunen and X. Litaudon and D. Moreau and X Litaudon and D Moreau",

year = "1998",

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T1 - Generation of hot spots by fast electrons in lower hybrid grills

AU - Rantamäki, Karin

AU - Pättikangas, Timo

AU - Karttunen, Seppo

AU - Litaudon, X.

AU - Moreau, D.

AU - Litaudon, X

AU - Moreau, D

PY - 1998

Y1 - 1998

N2 - Generation of hot spots on plasma facing components magnetically connected to the grill is a main limiting factor in high-power operation of a lower hybrid system. A possible explanation for the hot spots is the sputtering caused by fast electrons generated by parasitic absorption of lower hybrid power near the grill mouth. The behavior of the edge plasma near the grill mouth is investigated with a new tool in this context: the self-consistent particle-in-cell (PIC) code XPDP2 [V. Vahedi et al., Phys. Fluids B 5, 2719 (1993)]. The PIC simulations provide the key parameters of the problem: the absorbed power, the radial deposition profiles, and the energy spectrum of the accelerated particles close to the grill.

AB - Generation of hot spots on plasma facing components magnetically connected to the grill is a main limiting factor in high-power operation of a lower hybrid system. A possible explanation for the hot spots is the sputtering caused by fast electrons generated by parasitic absorption of lower hybrid power near the grill mouth. The behavior of the edge plasma near the grill mouth is investigated with a new tool in this context: the self-consistent particle-in-cell (PIC) code XPDP2 [V. Vahedi et al., Phys. Fluids B 5, 2719 (1993)]. The PIC simulations provide the key parameters of the problem: the absorbed power, the radial deposition profiles, and the energy spectrum of the accelerated particles close to the grill.

U2 - 10.1063/1.872940

DO - 10.1063/1.872940

M3 - Article

VL - 5

SP - 2553

EP - 2559

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1527-2419

IS - 7

ER -