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(96)00555-7

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 › Conference article › peer-review

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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(96)00555-7
State	Published - Feb 2 1997
Event	Proceedings of the 1996 12th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Saint-Raphael, Fr Duration: May 20 1996 → May 24 1996

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10.1016/S0022-3115(96)00555-7

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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(96)00555-7

@article{3d44424e2b054f1eb711f5b4c550a8cd,

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.",

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 = "2",

doi = "10.1016/S0022-3115(96)00555-7",

language = "English",

volume = "241-243",

pages = "511--516",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

note = "Proceedings of the 1996 12th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices ; Conference date: 20-05-1996 Through 24-05-1996",

}

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(96)00555-7

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 - 1997/2/2

Y1 - 1997/2/2

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.

UR - http://www.scopus.com/inward/record.url?scp=0031546501&partnerID=8YFLogxK

U2 - 10.1016/S0022-3115(96)00555-7

DO - 10.1016/S0022-3115(96)00555-7

M3 - Conference article

AN - SCOPUS:0031546501

SN - 0022-3115

VL - 241-243

SP - 511

EP - 516

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

T2 - Proceedings of the 1996 12th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices

Y2 - 20 May 1996 through 24 May 1996

ER -

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

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