Operation at high performance in optimized shear plasmas in JET

A.C.C. Sips; Y. Baranov; C.D. Challis; G.A. Cottrell; L.-G. Eriksson; C. Gormezano; C. Gowers; C.M. Greenfield; J.C.M. de Haas; M. von Hellerman; G.T.A. Huysmans; A. Howman; R. König; E.A. Lazarus; T.C. Luce; P.V. Nielsen; D.P. O'Brien; B.W. Rice; G.J. Sadler; F.X. Söldner; M.F. Stamp; E.J. Strait; B.J.D. Tubbing; M. Wade; D.J. Ward

doi:10.1088/0741-3335/40/6/020

Operation at high performance in optimized shear plasmas in JET

A.C.C. Sips, Y. Baranov, C.D. Challis, G.A. Cottrell, L.-G. Eriksson, C. Gormezano, C. Gowers, C.M. Greenfield, J.C.M. de Haas, M. von Hellerman, G.T.A. Huysmans, A. Howman, R. König, E.A. Lazarus, T.C. Luce, P.V. Nielsen, D.P. O'Brien, B.W. Rice, G.J. Sadler, F.X. SöldnerM.F. Stamp, E.J. Strait, B.J.D. Tubbing, M. Wade, D.J. Ward

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Abstract

Heating during the early part of the current rise phase gives a low or negative magnetic shear (= 0741-3335/40/6/020/img27(dq/dr)) in the centre of JET plasmas. Under these conditions the confinement improves with high additional heating power heating during the current ramp-up phase of the discharge. The reduction in the transport manifests itself as a peaking of the profiles with a large gradient region near 0741-3335/40/6/020/img28 = 0.55. The best discharges have no transport barrier at the edge of the plasma (L-mode). This allows central power deposition by the neutral beams in JET. A control of the plasma pressure, using feedback of the additional heating power in real-time, minimizes the impact of magnetohydrodynamic instabilities. As a result, these discharges achieve the highest D-D neutron rates in JET; 0741-3335/40/6/020/img29, with 0741-3335/40/6/020/img30, 0741-3335/40/6/020/img31 and 0741-3335/40/6/020/img32.

Original language	English
Pages (from-to)	1171-1184
Journal	Plasma Physics and Controlled Fusion
Volume	40
Issue number	6
DOIs	https://doi.org/10.1088/0741-3335/40/6/020
Publication status	Published - 1 Jun 1998
Externally published	Yes

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Sips, A. C. C., Baranov, Y., Challis, C. D., Cottrell, G. A., Eriksson, L.-G., Gormezano, C., Gowers, C., Greenfield, C. M., de Haas, J. C. M., von Hellerman, M., Huysmans, G. T. A., Howman, A., König, R., Lazarus, E. A., Luce, T. C., Nielsen, P. V., O'Brien, D. P., Rice, B. W., Sadler, G. J., ... Ward, D. J. (1998). Operation at high performance in optimized shear plasmas in JET. Plasma Physics and Controlled Fusion, 40(6), 1171-1184. https://doi.org/10.1088/0741-3335/40/6/020

@article{953f46c693df47a09ebb951de7489eb5,

title = "Operation at high performance in optimized shear plasmas in JET",

abstract = "Heating during the early part of the current rise phase gives a low or negative magnetic shear (= 0741-3335/40/6/020/img27(dq/dr)) in the centre of JET plasmas. Under these conditions the confinement improves with high additional heating power heating during the current ramp-up phase of the discharge. The reduction in the transport manifests itself as a peaking of the profiles with a large gradient region near 0741-3335/40/6/020/img28 = 0.55. The best discharges have no transport barrier at the edge of the plasma (L-mode). This allows central power deposition by the neutral beams in JET. A control of the plasma pressure, using feedback of the additional heating power in real-time, minimizes the impact of magnetohydrodynamic instabilities. As a result, these discharges achieve the highest D-D neutron rates in JET; 0741-3335/40/6/020/img29, with 0741-3335/40/6/020/img30, 0741-3335/40/6/020/img31 and 0741-3335/40/6/020/img32.",

author = "A.C.C. Sips and Y. Baranov and C.D. Challis and G.A. Cottrell and L.-G. Eriksson and C. Gormezano and C. Gowers and C.M. Greenfield and {de Haas}, J.C.M. and {von Hellerman}, M. and G.T.A. Huysmans and A. Howman and R. K{\"o}nig and E.A. Lazarus and T.C. Luce and P.V. Nielsen and D.P. O'Brien and B.W. Rice and G.J. Sadler and F.X. S{\"o}ldner and M.F. Stamp and E.J. Strait and B.J.D. Tubbing and M. Wade and D.J. Ward",

year = "1998",

month = jun,

day = "1",

doi = "10.1088/0741-3335/40/6/020",

language = "English",

volume = "40",

pages = "1171--1184",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "6",

}

Sips, ACC, Baranov, Y, Challis, CD, Cottrell, GA, Eriksson, L-G, Gormezano, C, Gowers, C, Greenfield, CM, de Haas, JCM, von Hellerman, M, Huysmans, GTA, Howman, A, König, R, Lazarus, EA, Luce, TC, Nielsen, PV, O'Brien, DP, Rice, BW, Sadler, GJ, Söldner, FX, Stamp, MF, Strait, EJ, Tubbing, BJD, Wade, M & Ward, DJ 1998, 'Operation at high performance in optimized shear plasmas in JET', Plasma Physics and Controlled Fusion, vol. 40, no. 6, pp. 1171-1184. https://doi.org/10.1088/0741-3335/40/6/020

TY - JOUR

T1 - Operation at high performance in optimized shear plasmas in JET

AU - Sips, A.C.C.

AU - Baranov, Y.

AU - Challis, C.D.

AU - Cottrell, G.A.

AU - Eriksson, L.-G.

AU - Gormezano, C.

AU - Gowers, C.

AU - Greenfield, C.M.

AU - de Haas, J.C.M.

AU - von Hellerman, M.

AU - Huysmans, G.T.A.

AU - Howman, A.

AU - König, R.

AU - Lazarus, E.A.

AU - Luce, T.C.

AU - Nielsen, P.V.

AU - O'Brien, D.P.

AU - Rice, B.W.

AU - Sadler, G.J.

AU - Söldner, F.X.

AU - Stamp, M.F.

AU - Strait, E.J.

AU - Tubbing, B.J.D.

AU - Wade, M.

AU - Ward, D.J.

PY - 1998/6/1

Y1 - 1998/6/1

N2 - Heating during the early part of the current rise phase gives a low or negative magnetic shear (= 0741-3335/40/6/020/img27(dq/dr)) in the centre of JET plasmas. Under these conditions the confinement improves with high additional heating power heating during the current ramp-up phase of the discharge. The reduction in the transport manifests itself as a peaking of the profiles with a large gradient region near 0741-3335/40/6/020/img28 = 0.55. The best discharges have no transport barrier at the edge of the plasma (L-mode). This allows central power deposition by the neutral beams in JET. A control of the plasma pressure, using feedback of the additional heating power in real-time, minimizes the impact of magnetohydrodynamic instabilities. As a result, these discharges achieve the highest D-D neutron rates in JET; 0741-3335/40/6/020/img29, with 0741-3335/40/6/020/img30, 0741-3335/40/6/020/img31 and 0741-3335/40/6/020/img32.

AB - Heating during the early part of the current rise phase gives a low or negative magnetic shear (= 0741-3335/40/6/020/img27(dq/dr)) in the centre of JET plasmas. Under these conditions the confinement improves with high additional heating power heating during the current ramp-up phase of the discharge. The reduction in the transport manifests itself as a peaking of the profiles with a large gradient region near 0741-3335/40/6/020/img28 = 0.55. The best discharges have no transport barrier at the edge of the plasma (L-mode). This allows central power deposition by the neutral beams in JET. A control of the plasma pressure, using feedback of the additional heating power in real-time, minimizes the impact of magnetohydrodynamic instabilities. As a result, these discharges achieve the highest D-D neutron rates in JET; 0741-3335/40/6/020/img29, with 0741-3335/40/6/020/img30, 0741-3335/40/6/020/img31 and 0741-3335/40/6/020/img32.

U2 - 10.1088/0741-3335/40/6/020

DO - 10.1088/0741-3335/40/6/020

M3 - Article

SN - 0741-3335

VL - 40

SP - 1171

EP - 1184

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 6

ER -

Operation at high performance in optimized shear plasmas in JET

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