Enhanced heat flux in the scrape-off layer due to electrons accelerated in the near field of lower hybrid grills

M. Goniche; D. Guilhem; P. Bibet; P. Froissard; X. Litaudon; G. Rey; J. Mailloux; Y. Demers; V. Fuchs; P. Jacquet; J. H. Harris; J. T. Hogan

doi:10.1088/0029-5515/38/6/309

Enhanced heat flux in the scrape-off layer due to electrons accelerated in the near field of lower hybrid grills

M. Goniche, D. Guilhem, P. Bibet, P. Froissard, X. Litaudon, G. Rey, J. Mailloux, Y. Demers, V. Fuchs, P. Jacquet, J. H. Harris, J. T. Hogan

Power Exhaust and Particle Control

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

77 Scopus citations

Abstract

As a result of experimental observations of localized heat flux on components magnetically connected to radiating waveguides in Tore Supra and in TdeV, the acceleration of electrons near lower hybrid (LH) antennas has been investigated. A simple analytical model has been developed to compute the dynamics of the particles in the near field approximation. Landau damping of the very high N_∥ (20 < N_∥ < 100) component of the launched spectrum on the thermal electrons of the scrape-off layer (SOL) is found to occur. Simulation of a typical LH pulse in Tore Supra indicates that the electrons can be accelerated up to 2-3 keV. Modelling of the interaction of this fast electron population with the edge plasma allows a calculation of the heat flux on plasma facing components that are magnetically connected to the antenna. Model results and the results of experiments in Tore Supra and TdeV are compared. The calculated heat fluxes are found to be fairly consistent when the variation of convective heat flux at the grill aperture is taken into account. From this analysis, it is concluded that, for an LH power density of 25 MW/m², the resulting heat flux along the field lines (3.5 MW/m²) is manageable for the components connected to the antenna, provided that good coupling can be maintained at a low density in front of the grill.

Original language	English
Pages (from-to)	919-937
Number of pages	19
Journal	Nuclear Fusion
Volume	38
Issue number	6
DOIs	https://doi.org/10.1088/0029-5515/38/6/309
State	Published - 1998

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1088/0029-5515/38/6/309

Cite this

@article{eda1ffe8de5a4da5a3a3519dac2a4895,

title = "Enhanced heat flux in the scrape-off layer due to electrons accelerated in the near field of lower hybrid grills",

abstract = "As a result of experimental observations of localized heat flux on components magnetically connected to radiating waveguides in Tore Supra and in TdeV, the acceleration of electrons near lower hybrid (LH) antennas has been investigated. A simple analytical model has been developed to compute the dynamics of the particles in the near field approximation. Landau damping of the very high N∥ (20 < N∥ < 100) component of the launched spectrum on the thermal electrons of the scrape-off layer (SOL) is found to occur. Simulation of a typical LH pulse in Tore Supra indicates that the electrons can be accelerated up to 2-3 keV. Modelling of the interaction of this fast electron population with the edge plasma allows a calculation of the heat flux on plasma facing components that are magnetically connected to the antenna. Model results and the results of experiments in Tore Supra and TdeV are compared. The calculated heat fluxes are found to be fairly consistent when the variation of convective heat flux at the grill aperture is taken into account. From this analysis, it is concluded that, for an LH power density of 25 MW/m2, the resulting heat flux along the field lines (3.5 MW/m2) is manageable for the components connected to the antenna, provided that good coupling can be maintained at a low density in front of the grill.",

author = "M. Goniche and D. Guilhem and P. Bibet and P. Froissard and X. Litaudon and G. Rey and J. Mailloux and Y. Demers and V. Fuchs and P. Jacquet and Harris, {J. H.} and Hogan, {J. T.}",

year = "1998",

doi = "10.1088/0029-5515/38/6/309",

language = "English",

volume = "38",

pages = "919--937",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "6",

}

TY - JOUR

T1 - Enhanced heat flux in the scrape-off layer due to electrons accelerated in the near field of lower hybrid grills

AU - Goniche, M.

AU - Guilhem, D.

AU - Bibet, P.

AU - Froissard, P.

AU - Litaudon, X.

AU - Rey, G.

AU - Mailloux, J.

AU - Demers, Y.

AU - Fuchs, V.

AU - Jacquet, P.

AU - Harris, J. H.

AU - Hogan, J. T.

PY - 1998

Y1 - 1998

N2 - As a result of experimental observations of localized heat flux on components magnetically connected to radiating waveguides in Tore Supra and in TdeV, the acceleration of electrons near lower hybrid (LH) antennas has been investigated. A simple analytical model has been developed to compute the dynamics of the particles in the near field approximation. Landau damping of the very high N∥ (20 < N∥ < 100) component of the launched spectrum on the thermal electrons of the scrape-off layer (SOL) is found to occur. Simulation of a typical LH pulse in Tore Supra indicates that the electrons can be accelerated up to 2-3 keV. Modelling of the interaction of this fast electron population with the edge plasma allows a calculation of the heat flux on plasma facing components that are magnetically connected to the antenna. Model results and the results of experiments in Tore Supra and TdeV are compared. The calculated heat fluxes are found to be fairly consistent when the variation of convective heat flux at the grill aperture is taken into account. From this analysis, it is concluded that, for an LH power density of 25 MW/m2, the resulting heat flux along the field lines (3.5 MW/m2) is manageable for the components connected to the antenna, provided that good coupling can be maintained at a low density in front of the grill.

AB - As a result of experimental observations of localized heat flux on components magnetically connected to radiating waveguides in Tore Supra and in TdeV, the acceleration of electrons near lower hybrid (LH) antennas has been investigated. A simple analytical model has been developed to compute the dynamics of the particles in the near field approximation. Landau damping of the very high N∥ (20 < N∥ < 100) component of the launched spectrum on the thermal electrons of the scrape-off layer (SOL) is found to occur. Simulation of a typical LH pulse in Tore Supra indicates that the electrons can be accelerated up to 2-3 keV. Modelling of the interaction of this fast electron population with the edge plasma allows a calculation of the heat flux on plasma facing components that are magnetically connected to the antenna. Model results and the results of experiments in Tore Supra and TdeV are compared. The calculated heat fluxes are found to be fairly consistent when the variation of convective heat flux at the grill aperture is taken into account. From this analysis, it is concluded that, for an LH power density of 25 MW/m2, the resulting heat flux along the field lines (3.5 MW/m2) is manageable for the components connected to the antenna, provided that good coupling can be maintained at a low density in front of the grill.

UR - http://www.scopus.com/inward/record.url?scp=0032083533&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/38/6/309

DO - 10.1088/0029-5515/38/6/309

M3 - Article

AN - SCOPUS:0032083533

SN - 0029-5515

VL - 38

SP - 919

EP - 937

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 6

ER -

Enhanced heat flux in the scrape-off layer due to electrons accelerated in the near field of lower hybrid grills

Abstract

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this