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. Luce; P. Nielsen; D. O'Brien; B. W. Rice; G. 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. Luce
, P. Nielsen
, D. O'Brien
, B. W. Rice
, G. Sadler
, F. X. Söldner

M. F. Stamp, E. J. Strait, B. J.D. Tubbing, M. Wade, D. J. Ward

Fusion and Fission Energy and Science Di

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

51 Scopus citations

Abstract

Heating during the early part of the current rise phase gives a low or negative magnetic shear (= r/q(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 r/a = 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; S_n = 5.6 × 10¹⁶ neutrons s^-1, with n_e0 ≈ 6 × 10¹⁹ m^-3, T_e0 ≈ 12 keV and T_i0 ≈ 26 keV.

Original language	English
Pages (from-to)	1171-1184
Number of pages	14
Journal	Plasma Physics and Controlled Fusion
Volume	40
Issue number	6
DOIs	https://doi.org/10.1088/0741-3335/40/6/020
State	Published - 1998

Access to Document

10.1088/0741-3335/40/6/020

Cite this

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., Nielsen, P., O'Brien, D., Rice, B. W., Sadler, G., ... 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{3fea0ebdda6f4f28a3179bfb20acdf30,

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 (= r/q(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 r/a = 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; Sn = 5.6 × 1016 neutrons s-1, with ne0 ≈ 6 × 1019 m-3, Te0 ≈ 12 keV and Ti0 ≈ 26 keV.",

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

year = "1998",

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",

number = "6",

}

Sips, ACC, Baranov, Y, Challis, CD, Cottrell, GA, Eriksson, LG, Gormezano, C, Gowers, C, Greenfield, CM, De Haas, JCM, Von Hellerman, M, Huysmans, GTA, Howman, A, König, R, Lazarus, EA, Luce, T, Nielsen, P, O'Brien, D, Rice, BW, Sadler, G, 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.

AU - Nielsen, P.

AU - O'Brien, D.

AU - Rice, B. W.

AU - Sadler, G.

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

Y1 - 1998

N2 - Heating during the early part of the current rise phase gives a low or negative magnetic shear (= r/q(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 r/a = 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; Sn = 5.6 × 1016 neutrons s-1, with ne0 ≈ 6 × 1019 m-3, Te0 ≈ 12 keV and Ti0 ≈ 26 keV.

AB - Heating during the early part of the current rise phase gives a low or negative magnetic shear (= r/q(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 r/a = 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; Sn = 5.6 × 1016 neutrons s-1, with ne0 ≈ 6 × 1019 m-3, Te0 ≈ 12 keV and Ti0 ≈ 26 keV.

UR - https://www.scopus.com/pages/publications/0032100005

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

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

M3 - Article

AN - SCOPUS:0032100005

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this