Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra

J. H. Harris; T. Hutter; J. T. Hogan; V. Basiuk; B. Beaumont; A. Becoulet; S. Bremond; M. D. Carter; M. Goniche; R. H. Goulding; D. Guilhem; G. R. Haste; D. J. Hoffman; X. Litaudon; F. Nguyen

doi:10.1016/s0022-3115(97)80090-6

Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra

J. H. Harris, T. Hutter, J. T. Hogan, V. Basiuk, B. Beaumont, A. Becoulet, S. Bremond, M. D. Carter, M. Goniche, R. H. Goulding, D. Guilhem, G. R. Haste, D. J. Hoffman, X. Litaudon, F. Nguyen

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

2 Scopus citations

Abstract

The edge plasma interactions of the actively cooled radio-frequency heating launchers in Tore Supra ion-cyclotron range of frequencies (ICRF) antennas and lower-hybrid (LH) grills are studied using infrared video imaging. On the two-strap ICRF antennas, operated in fast-wave electron heating or current drive mode, hot spots with temperatures of 500-900°C are observed by the end of 2 s power pulses of 2 MW per antenna. The steady-state temperature distribution is determined principally by the relative phase of the two antenna straps: dipole (heating) phasing results in significantly less antenna heating than does 90° (current drive) phasing. Transient heat fluxes of 1-20 MW/m² are measured on the lateral protection bumpers at ICRF turn-on; these fluxes are primarily a function of plasma and radio frequency (rf) control. The remarkable feature of the lower hybrid edge interaction is the production of beams of heat flux in front of the grills: these beams propagate along the helical magnetic field lines and can deliver fluxes of 5-10 MW/m² over areas of several cm² to plasma-facing components. Both the ICRF and LH phenomena appear to result from the acceleration of particles by the near fields of the launchers. Modeling of the heat flux deposition on components and its relation to sputtering processes is presented.

Original language	English
Pages (from-to)	511-516
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	241-243
DOIs	https://doi.org/10.1016/s0022-3115(97)80090-6
State	Published - Feb 11 1997

Funding

This work was supported in part by the Office of Fusion Energy, U.S. Department of Energy, under contract DE-AC05-96OR22464 with Lockheed-Martin Energy Research Corporation.

Funders	Funder number
Lockheed-Martin Energy Research Corporation
U.S. Department of Energy	DE-AC05-96OR22464
Fusion for Energy

Keywords

Boundary plasma
RF heating
Sheath physics
TORE SUPRA

UN SDGs

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

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10.1016/s0022-3115(97)80090-6

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Harris, J. H., Hutter, T., Hogan, J. T., Basiuk, V., Beaumont, B., Becoulet, A., Bremond, S., Carter, M. D., Goniche, M., Goulding, R. H., Guilhem, D., Haste, G. R., Hoffman, D. J., Litaudon, X., & Nguyen, F. (1997). Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra. Journal of Nuclear Materials, 241-243, 511-516. https://doi.org/10.1016/s0022-3115(97)80090-6

@article{dc6c05e3c291494898ddad9f21ac1872,

title = "Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra",

abstract = "The edge plasma interactions of the actively cooled radio-frequency heating launchers in Tore Supra ion-cyclotron range of frequencies (ICRF) antennas and lower-hybrid (LH) grills are studied using infrared video imaging. On the two-strap ICRF antennas, operated in fast-wave electron heating or current drive mode, hot spots with temperatures of 500-900°C are observed by the end of 2 s power pulses of 2 MW per antenna. The steady-state temperature distribution is determined principally by the relative phase of the two antenna straps: dipole (heating) phasing results in significantly less antenna heating than does 90° (current drive) phasing. Transient heat fluxes of 1-20 MW/m2 are measured on the lateral protection bumpers at ICRF turn-on; these fluxes are primarily a function of plasma and radio frequency (rf) control. The remarkable feature of the lower hybrid edge interaction is the production of beams of heat flux in front of the grills: these beams propagate along the helical magnetic field lines and can deliver fluxes of 5-10 MW/m2 over areas of several cm2 to plasma-facing components. Both the ICRF and LH phenomena appear to result from the acceleration of particles by the near fields of the launchers. Modeling of the heat flux deposition on components and its relation to sputtering processes is presented.",

keywords = "Boundary plasma, RF heating, Sheath physics, TORE SUPRA",

author = "Harris, {J. H.} and T. Hutter and Hogan, {J. T.} and V. Basiuk and B. Beaumont and A. Becoulet and S. Bremond and Carter, {M. D.} and M. Goniche and Goulding, {R. H.} and D. Guilhem and Haste, {G. R.} and Hoffman, {D. J.} and X. Litaudon and F. Nguyen",

year = "1997",

month = feb,

day = "11",

doi = "10.1016/s0022-3115(97)80090-6",

language = "English",

volume = "241-243",

pages = "511--516",

journal = "Journal of Nuclear Materials",

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Harris, JH, Hutter, T, Hogan, JT, Basiuk, V, Beaumont, B, Becoulet, A, Bremond, S, Carter, MD, Goniche, M, Goulding, RH, Guilhem, D, Haste, GR, Hoffman, DJ, Litaudon, X & Nguyen, F 1997, 'Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra', Journal of Nuclear Materials, vol. 241-243, pp. 511-516. https://doi.org/10.1016/s0022-3115(97)80090-6

TY - JOUR

T1 - Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra

AU - Harris, J. H.

AU - Hutter, T.

AU - Hogan, J. T.

AU - Basiuk, V.

AU - Beaumont, B.

AU - Becoulet, A.

AU - Bremond, S.

AU - Carter, M. D.

AU - Goniche, M.

AU - Goulding, R. H.

AU - Guilhem, D.

AU - Haste, G. R.

AU - Hoffman, D. J.

AU - Litaudon, X.

AU - Nguyen, F.

PY - 1997/2/11

Y1 - 1997/2/11

N2 - The edge plasma interactions of the actively cooled radio-frequency heating launchers in Tore Supra ion-cyclotron range of frequencies (ICRF) antennas and lower-hybrid (LH) grills are studied using infrared video imaging. On the two-strap ICRF antennas, operated in fast-wave electron heating or current drive mode, hot spots with temperatures of 500-900°C are observed by the end of 2 s power pulses of 2 MW per antenna. The steady-state temperature distribution is determined principally by the relative phase of the two antenna straps: dipole (heating) phasing results in significantly less antenna heating than does 90° (current drive) phasing. Transient heat fluxes of 1-20 MW/m2 are measured on the lateral protection bumpers at ICRF turn-on; these fluxes are primarily a function of plasma and radio frequency (rf) control. The remarkable feature of the lower hybrid edge interaction is the production of beams of heat flux in front of the grills: these beams propagate along the helical magnetic field lines and can deliver fluxes of 5-10 MW/m2 over areas of several cm2 to plasma-facing components. Both the ICRF and LH phenomena appear to result from the acceleration of particles by the near fields of the launchers. Modeling of the heat flux deposition on components and its relation to sputtering processes is presented.

AB - The edge plasma interactions of the actively cooled radio-frequency heating launchers in Tore Supra ion-cyclotron range of frequencies (ICRF) antennas and lower-hybrid (LH) grills are studied using infrared video imaging. On the two-strap ICRF antennas, operated in fast-wave electron heating or current drive mode, hot spots with temperatures of 500-900°C are observed by the end of 2 s power pulses of 2 MW per antenna. The steady-state temperature distribution is determined principally by the relative phase of the two antenna straps: dipole (heating) phasing results in significantly less antenna heating than does 90° (current drive) phasing. Transient heat fluxes of 1-20 MW/m2 are measured on the lateral protection bumpers at ICRF turn-on; these fluxes are primarily a function of plasma and radio frequency (rf) control. The remarkable feature of the lower hybrid edge interaction is the production of beams of heat flux in front of the grills: these beams propagate along the helical magnetic field lines and can deliver fluxes of 5-10 MW/m2 over areas of several cm2 to plasma-facing components. Both the ICRF and LH phenomena appear to result from the acceleration of particles by the near fields of the launchers. Modeling of the heat flux deposition on components and its relation to sputtering processes is presented.

KW - Boundary plasma

KW - RF heating

KW - Sheath physics

KW - TORE SUPRA

UR - http://www.scopus.com/inward/record.url?scp=85084722716&partnerID=8YFLogxK

U2 - 10.1016/s0022-3115(97)80090-6

DO - 10.1016/s0022-3115(97)80090-6

M3 - Article

AN - SCOPUS:85084722716

SN - 0022-3115

VL - 241-243

SP - 511

EP - 516

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Plasma-surface interactions with ICRF antennas and lower hybrid grills in Tore Supra

Abstract

Funding

Keywords

UN SDGs

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