Effect of q-profile modification by LHCD on internal transport barriers in JET

C. D. Challis; Yu F. Baranov; G. D. Conway; C. Gormezano; C. W. Gowers; N. C. Hawkes; T. C. Hender; E. Joffrin; J. Mailloux; D. Mazon; S. Podda; R. Prentice; F. G. Rimini; S. E. Sharapov; A. C.C. Sips; B. C. Stratton; D. Testa; K. D. Zastrow

doi:10.1088/0741-3335/43/7/303

Effect of q-profile modification by LHCD on internal transport barriers in JET

C. D. Challis, Yu F. Baranov, G. D. Conway, C. Gormezano, C. W. Gowers, N. C. Hawkes, T. C. Hender, E. Joffrin, J. Mailloux, D. Mazon, S. Podda, R. Prentice, F. G. Rimini, S. E. Sharapov, A. C.C. Sips, B. C. Stratton, D. Testa, K. D. Zastrow

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Abstract

Optimized shear (OS) experiments in JET can generate an internal transport barrier (ITB) during a high power heating phase early in the plasma discharge. A strong link is generally observed between the formation of the barrier and the location of an integer q magnetic surface within a low magnetic shear (s = r/q(dq/dr)) region of the plasma. However, if the q-profile for such experiments is modified by applying lower hybrid heating and current drive (LHCD) before the main heating pulse, to provide a region of reduced or negative magnetic shear in the plasma core, ITBs can be formed the location of which does not exhibit any apparent association with a particular internal magnetic surface. Initial results suggest that q-profile modification using an LHCD prelude can also be used to reduce the heating power level required for ITB generation.

Original language	English (US)
Pages (from-to)	861-879
Number of pages	19
Journal	Plasma Physics and Controlled Fusion
Volume	43
Issue number	7
DOIs	https://doi.org/10.1088/0741-3335/43/7/303
State	Published - Jul 2001

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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Challis, C. D., Baranov, Y. F., Conway, G. D., Gormezano, C., Gowers, C. W., Hawkes, N. C., Hender, T. C., Joffrin, E., Mailloux, J., Mazon, D., Podda, S., Prentice, R., Rimini, F. G., Sharapov, S. E., Sips, A. C. C., Stratton, B. C., Testa, D., & Zastrow, K. D. (2001). Effect of q-profile modification by LHCD on internal transport barriers in JET. Plasma Physics and Controlled Fusion, 43(7), 861-879. https://doi.org/10.1088/0741-3335/43/7/303

@article{a411e4d0ce724141a991e293f8f329e8,

title = "Effect of q-profile modification by LHCD on internal transport barriers in JET",

abstract = "Optimized shear (OS) experiments in JET can generate an internal transport barrier (ITB) during a high power heating phase early in the plasma discharge. A strong link is generally observed between the formation of the barrier and the location of an integer q magnetic surface within a low magnetic shear (s = r/q(dq/dr)) region of the plasma. However, if the q-profile for such experiments is modified by applying lower hybrid heating and current drive (LHCD) before the main heating pulse, to provide a region of reduced or negative magnetic shear in the plasma core, ITBs can be formed the location of which does not exhibit any apparent association with a particular internal magnetic surface. Initial results suggest that q-profile modification using an LHCD prelude can also be used to reduce the heating power level required for ITB generation.",

author = "Challis, \{C. D.\} and Baranov, \{Yu F.\} and Conway, \{G. D.\} and C. Gormezano and Gowers, \{C. W.\} and Hawkes, \{N. C.\} and Hender, \{T. C.\} and E. Joffrin and J. Mailloux and D. Mazon and S. Podda and R. Prentice and Rimini, \{F. G.\} and Sharapov, \{S. E.\} and Sips, \{A. C.C.\} and Stratton, \{B. C.\} and D. Testa and Zastrow, \{K. D.\}",

year = "2001",

month = jul,

doi = "10.1088/0741-3335/43/7/303",

language = "English (US)",

volume = "43",

pages = "861--879",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "7",

}

Challis, CD, Baranov, YF, Conway, GD, Gormezano, C, Gowers, CW, Hawkes, NC, Hender, TC, Joffrin, E, Mailloux, J, Mazon, D, Podda, S, Prentice, R, Rimini, FG, Sharapov, SE, Sips, ACC, Stratton, BC, Testa, D & Zastrow, KD 2001, 'Effect of q-profile modification by LHCD on internal transport barriers in JET', Plasma Physics and Controlled Fusion, vol. 43, no. 7, pp. 861-879. https://doi.org/10.1088/0741-3335/43/7/303

TY - JOUR

T1 - Effect of q-profile modification by LHCD on internal transport barriers in JET

AU - Challis, C. D.

AU - Baranov, Yu F.

AU - Conway, G. D.

AU - Gormezano, C.

AU - Gowers, C. W.

AU - Hawkes, N. C.

AU - Hender, T. C.

AU - Joffrin, E.

AU - Mailloux, J.

AU - Mazon, D.

AU - Podda, S.

AU - Prentice, R.

AU - Rimini, F. G.

AU - Sharapov, S. E.

AU - Sips, A. C.C.

AU - Stratton, B. C.

AU - Testa, D.

AU - Zastrow, K. D.

PY - 2001/7

Y1 - 2001/7

N2 - Optimized shear (OS) experiments in JET can generate an internal transport barrier (ITB) during a high power heating phase early in the plasma discharge. A strong link is generally observed between the formation of the barrier and the location of an integer q magnetic surface within a low magnetic shear (s = r/q(dq/dr)) region of the plasma. However, if the q-profile for such experiments is modified by applying lower hybrid heating and current drive (LHCD) before the main heating pulse, to provide a region of reduced or negative magnetic shear in the plasma core, ITBs can be formed the location of which does not exhibit any apparent association with a particular internal magnetic surface. Initial results suggest that q-profile modification using an LHCD prelude can also be used to reduce the heating power level required for ITB generation.

AB - Optimized shear (OS) experiments in JET can generate an internal transport barrier (ITB) during a high power heating phase early in the plasma discharge. A strong link is generally observed between the formation of the barrier and the location of an integer q magnetic surface within a low magnetic shear (s = r/q(dq/dr)) region of the plasma. However, if the q-profile for such experiments is modified by applying lower hybrid heating and current drive (LHCD) before the main heating pulse, to provide a region of reduced or negative magnetic shear in the plasma core, ITBs can be formed the location of which does not exhibit any apparent association with a particular internal magnetic surface. Initial results suggest that q-profile modification using an LHCD prelude can also be used to reduce the heating power level required for ITB generation.

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JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 7

ER -

Effect of q-profile modification by LHCD on internal transport barriers in JET

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