L-H transition in the mega-Amp spherical tokamak

R.J. Akers; G.F. Counsell; A. Sykes; L.C. Appel; E.R. Arends; C. Byrom; P.G. Carolan; N.J. Conway; G. Cunningham; A. Dnestrovskij; Y.N. Dnestrovskij; A.R. Field; S.J. Fielding; M. Gryaznevich; P. Helander; A. Kirk; Søren Bang Korsholm; R. Martin; H. Meyer; M.P.S. Nightingale; C.M. Roach; V. Shevchenko; M. Tournianski; M.J. Walsh; C.D. Warrick

doi:10.1103/PhysRevLett.88.035002

L-H transition in the mega-Amp spherical tokamak

R.J. Akers, G.F. Counsell, A. Sykes, L.C. Appel, E.R. Arends, C. Byrom, P.G. Carolan, N.J. Conway, G. Cunningham, A. Dnestrovskij, Y.N. Dnestrovskij, A.R. Field, S.J. Fielding, M. Gryaznevich, P. Helander, A. Kirk, Søren Bang Korsholm, R. Martin, H. Meyer, M.P.S. NightingaleC.M. Roach, V. Shevchenko, M. Tournianski, M.J. Walsh, C.D. Warrick

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

H-mode plasmas have been achieved on the MAST spherical tokamak at input power considerably higher than predicted by conventional threshold scalings. Following L-H transition, a clear improvement in energy confinement is obtained, exceeding recent international scalings even at densities approaching the Greenwald density limit. Transition is accompanied by an order-of-magnitude increase in edge-density gradient, a marked decrease in turbulence, the efficient conversion of internal electron Bernstein waves into free space waves, and the onset and saturation of edge poloidal rotation.

Original language	English
Journal	Physical Review Letters
Volume	88
Issue number	3
Pages (from-to)	035002.1-035002.4
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.88.035002
Publication status	Published - 2002

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Akers, R. J., Counsell, G. F., Sykes, A., Appel, L. C., Arends, E. R., Byrom, C., Carolan, P. G., Conway, N. J., Cunningham, G., Dnestrovskij, A., Dnestrovskij, Y. N., Field, A. R., Fielding, S. J., Gryaznevich, M., Helander, P., Kirk, A., Korsholm, S. B., Martin, R., Meyer, H., ... Warrick, C. D. (2002). L-H transition in the mega-Amp spherical tokamak. Physical Review Letters, 88(3), 035002.1-035002.4. https://doi.org/10.1103/PhysRevLett.88.035002

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abstract = "H-mode plasmas have been achieved on the MAST spherical tokamak at input power considerably higher than predicted by conventional threshold scalings. Following L-H transition, a clear improvement in energy confinement is obtained, exceeding recent international scalings even at densities approaching the Greenwald density limit. Transition is accompanied by an order-of-magnitude increase in edge-density gradient, a marked decrease in turbulence, the efficient conversion of internal electron Bernstein waves into free space waves, and the onset and saturation of edge poloidal rotation. ",

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Akers, RJ, Counsell, GF, Sykes, A, Appel, LC, Arends, ER, Byrom, C, Carolan, PG, Conway, NJ, Cunningham, G, Dnestrovskij, A, Dnestrovskij, YN, Field, AR, Fielding, SJ, Gryaznevich, M, Helander, P, Kirk, A, Korsholm, SB, Martin, R, Meyer, H, Nightingale, MPS, Roach, CM, Shevchenko, V, Tournianski, M, Walsh, MJ & Warrick, CD 2002, 'L-H transition in the mega-Amp spherical tokamak', Physical Review Letters, vol. 88, no. 3, pp. 035002.1-035002.4. https://doi.org/10.1103/PhysRevLett.88.035002

TY - JOUR

T1 - L-H transition in the mega-Amp spherical tokamak

AU - Akers, R.J.

AU - Counsell, G.F.

AU - Sykes, A.

AU - Appel, L.C.

AU - Arends, E.R.

AU - Byrom, C.

AU - Carolan, P.G.

AU - Conway, N.J.

AU - Cunningham, G.

AU - Dnestrovskij, A.

AU - Dnestrovskij, Y.N.

AU - Field, A.R.

AU - Fielding, S.J.

AU - Gryaznevich, M.

AU - Helander, P.

AU - Kirk, A.

AU - Korsholm, Søren Bang

AU - Martin, R.

AU - Meyer, H.

AU - Nightingale, M.P.S.

AU - Roach, C.M.

AU - Shevchenko, V.

AU - Tournianski, M.

AU - Walsh, M.J.

AU - Warrick, C.D.

PY - 2002

Y1 - 2002

N2 - H-mode plasmas have been achieved on the MAST spherical tokamak at input power considerably higher than predicted by conventional threshold scalings. Following L-H transition, a clear improvement in energy confinement is obtained, exceeding recent international scalings even at densities approaching the Greenwald density limit. Transition is accompanied by an order-of-magnitude increase in edge-density gradient, a marked decrease in turbulence, the efficient conversion of internal electron Bernstein waves into free space waves, and the onset and saturation of edge poloidal rotation.

AB - H-mode plasmas have been achieved on the MAST spherical tokamak at input power considerably higher than predicted by conventional threshold scalings. Following L-H transition, a clear improvement in energy confinement is obtained, exceeding recent international scalings even at densities approaching the Greenwald density limit. Transition is accompanied by an order-of-magnitude increase in edge-density gradient, a marked decrease in turbulence, the efficient conversion of internal electron Bernstein waves into free space waves, and the onset and saturation of edge poloidal rotation.

KW - 2-E tekno

U2 - 10.1103/PhysRevLett.88.035002

DO - 10.1103/PhysRevLett.88.035002

M3 - Journal article

C2 - 11801066

SN - 0031-9007

VL - 88

SP - 035002.1-035002.4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

ER -

L-H transition in the mega-Amp spherical tokamak

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