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

PPPL NSTX

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

110 Scopus citations

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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10.1088/0741-3335/43/7/303

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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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UR - https://www.scopus.com/pages/publications/0035393906#tab=citedBy

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AN - SCOPUS:0035393906

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VL - 43

SP - 861

EP - 879

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

Abstract

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