Semi-empirical models of h-mode discharges

C. E. Singer; M. H. Redi; D. A. Boyd; A. J. Cavallo; B. Grek; D. B. Heifetz; R. A. Hülse; D. W. Johnson; W. D. Langer; B. Leblanc; D. R. Mikkelsen; F. G.P. Seidl; A. Eberhagen; O. Gehre; F. Karger; M. Keilhacker; S. Kissel; O. Kluber; D. Meisel; H. D. Murmann; H. Niedermeyer; H. Rapp; H. Rohr; A. Stäbler; K. H. Steuer; F. Wagner

doi:10.1088/0029-5515/25/11/004

Semi-empirical models of h-mode discharges

C. E. Singer, M. H. Redi, D. A. Boyd, A. J. Cavallo, B. Grek, D. B. Heifetz, R. A. Hülse, D. W. Johnson, W. D. Langer, B. Leblanc, D. R. Mikkelsen, F. G.P. Seidl, A. Eberhagen, O. Gehre, F. Karger, M. Keilhacker, S. Kissel, O. Kluber, D. Meisel, H. D. MurmannH. Niedermeyer, H. Rapp, H. Rohr, A. Stäbler, K. H. Steuer, F. Wagner

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

Abstract

The H-mode transition can lead to a rapid increase in tokamak plasma confinement. A semi-empirical transport model was derived from global OH and L-mode confinement scalings and then applied to simulation of H-mode discharges. The radial diffusivities in the model depend on local density and pressure gradients and satisfy an appropriate dimensional constraint. Examples are shown of the application of this model and of similar models to the detailed simulation of two discharges which exhibit an H-mode transition. The models reproduce essential features of plasma confinement in the Ohmic heating and the low- and high-confinement phases of these discharges. In particular, the evolution of plasma energy content through the H-mode transition can be reproduced without any sudden or ad hoc modification of the plasma transport formulation.

Original language	English (US)
Pages (from-to)	1555-1573
Number of pages	19
Journal	Nuclear Fusion
Volume	25
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/25/11/004
State	Published - Nov 1985
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/25/11/004

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Singer, C. E., Redi, M. H., Boyd, D. A., Cavallo, A. J., Grek, B., Heifetz, D. B., Hülse, R. A., Johnson, D. W., Langer, W. D., Leblanc, B., Mikkelsen, D. R., Seidl, F. G. P., Eberhagen, A., Gehre, O., Karger, F., Keilhacker, M., Kissel, S., Kluber, O., Meisel, D., ... Wagner, F. (1985). Semi-empirical models of h-mode discharges. Nuclear Fusion, 25(11), 1555-1573. https://doi.org/10.1088/0029-5515/25/11/004

Singer, CE, Redi, MH, Boyd, DA, Cavallo, AJ, Grek, B, Heifetz, DB, Hülse, RA, Johnson, DW, Langer, WD, Leblanc, B, Mikkelsen, DR, Seidl, FGP, Eberhagen, A, Gehre, O, Karger, F, Keilhacker, M, Kissel, S, Kluber, O, Meisel, D, Murmann, HD, Niedermeyer, H, Rapp, H, Rohr, H, Stäbler, A, Steuer, KH & Wagner, F 1985, 'Semi-empirical models of h-mode discharges', Nuclear Fusion, vol. 25, no. 11, pp. 1555-1573. https://doi.org/10.1088/0029-5515/25/11/004

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abstract = "The H-mode transition can lead to a rapid increase in tokamak plasma confinement. A semi-empirical transport model was derived from global OH and L-mode confinement scalings and then applied to simulation of H-mode discharges. The radial diffusivities in the model depend on local density and pressure gradients and satisfy an appropriate dimensional constraint. Examples are shown of the application of this model and of similar models to the detailed simulation of two discharges which exhibit an H-mode transition. The models reproduce essential features of plasma confinement in the Ohmic heating and the low- and high-confinement phases of these discharges. In particular, the evolution of plasma energy content through the H-mode transition can be reproduced without any sudden or ad hoc modification of the plasma transport formulation.",

author = "Singer, {C. E.} and Redi, {M. H.} and Boyd, {D. A.} and Cavallo, {A. J.} and B. Grek and Heifetz, {D. B.} and H{\"u}lse, {R. A.} and Johnson, {D. W.} and Langer, {W. D.} and B. Leblanc and Mikkelsen, {D. R.} and Seidl, {F. G.P.} and A. Eberhagen and O. Gehre and F. Karger and M. Keilhacker and S. Kissel and O. Kluber and D. Meisel and Murmann, {H. D.} and H. Niedermeyer and H. Rapp and H. Rohr and A. St{\"a}bler and Steuer, {K. H.} and F. Wagner",

year = "1985",

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doi = "10.1088/0029-5515/25/11/004",

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T1 - Semi-empirical models of h-mode discharges

AU - Singer, C. E.

AU - Redi, M. H.

AU - Boyd, D. A.

AU - Cavallo, A. J.

AU - Grek, B.

AU - Heifetz, D. B.

AU - Hülse, R. A.

AU - Johnson, D. W.

AU - Langer, W. D.

AU - Leblanc, B.

AU - Mikkelsen, D. R.

AU - Seidl, F. G.P.

AU - Eberhagen, A.

AU - Gehre, O.

AU - Karger, F.

AU - Keilhacker, M.

AU - Kissel, S.

AU - Kluber, O.

AU - Meisel, D.

AU - Murmann, H. D.

AU - Niedermeyer, H.

AU - Rapp, H.

AU - Rohr, H.

AU - Stäbler, A.

AU - Steuer, K. H.

AU - Wagner, F.

PY - 1985/11

Y1 - 1985/11

N2 - The H-mode transition can lead to a rapid increase in tokamak plasma confinement. A semi-empirical transport model was derived from global OH and L-mode confinement scalings and then applied to simulation of H-mode discharges. The radial diffusivities in the model depend on local density and pressure gradients and satisfy an appropriate dimensional constraint. Examples are shown of the application of this model and of similar models to the detailed simulation of two discharges which exhibit an H-mode transition. The models reproduce essential features of plasma confinement in the Ohmic heating and the low- and high-confinement phases of these discharges. In particular, the evolution of plasma energy content through the H-mode transition can be reproduced without any sudden or ad hoc modification of the plasma transport formulation.

AB - The H-mode transition can lead to a rapid increase in tokamak plasma confinement. A semi-empirical transport model was derived from global OH and L-mode confinement scalings and then applied to simulation of H-mode discharges. The radial diffusivities in the model depend on local density and pressure gradients and satisfy an appropriate dimensional constraint. Examples are shown of the application of this model and of similar models to the detailed simulation of two discharges which exhibit an H-mode transition. The models reproduce essential features of plasma confinement in the Ohmic heating and the low- and high-confinement phases of these discharges. In particular, the evolution of plasma energy content through the H-mode transition can be reproduced without any sudden or ad hoc modification of the plasma transport formulation.

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Semi-empirical models of h-mode discharges

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