Predictive modelling of JET optimized shear discharges

V.V. Parail; Y.F. Baranov; C.D. Challis; G.A. Cottrell; B.J. Fischer; C. Gormezano; G.T.A. Huysmans; X. Litaudon; A.C.C. Sips; F. X. Söldner; E.M. Springmann; A. Taroni; D.J. Ward

doi:10.1088/0029-5515/39/3/310

Predictive modelling of JET optimized shear discharges

V.V. Parail, Y.F. Baranov, C.D. Challis, G.A. Cottrell, B.J. Fischer, C. Gormezano, G.T.A. Huysmans, X. Litaudon, A.C.C. Sips, F. X. Söldner, E.M. Springmann, A. Taroni, D.J. Ward

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

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Abstract

Transport analysis of high performance JET plasmas with optimized magnetic shear (OMS) has revealed many interesting features which cannot be explained by the existing JET empirical transport model (Erba, M., et al., Plasma Phys. Control. Fusion 39 (1997) 261). TRANSP analysis shows that transport coefficients in OMS plasmas are often reduced in the plasma core (Cottrell, G.A., et al., in Controlled Fusion and Plasma Physics (Proc. 24th Eur. Conf. Berchtesgaden, 1997), Vol. 21A, Part I, European Physical Society, Geneva (1997) 81) to the level of ion neoclassical transport. TRANSP analysis and predictive modelling with JETTO show that this region of improved confinement appears near the plasma centre and then expands outwards in a way which does not follow either the evolution of the region with the negative magnetic shear or the propagation of the region with a large shear in plasma rotation. The best agreement with experiment has been achieved by using a transport model which combines the effect of a long wavelength decoupling due to small magnetic shear with its suppression by strong rotational shear. Predictive modelling of some of the characteristic JET OMS plasmas gives quite good agreement between such a model and the experimental data.

Original language	English
Pages (from-to)	429-437
Journal	Nuclear Fusion
Volume	39
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/39/3/310
Publication status	Published - 1 Mar 1999
Externally published	Yes

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http://adsabs.harvard.edu/abs/1999NucFu..39..429P

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title = "Predictive modelling of JET optimized shear discharges",

abstract = "Transport analysis of high performance JET plasmas with optimized magnetic shear (OMS) has revealed many interesting features which cannot be explained by the existing JET empirical transport model (Erba, M., et al., Plasma Phys. Control. Fusion 39 (1997) 261). TRANSP analysis shows that transport coefficients in OMS plasmas are often reduced in the plasma core (Cottrell, G.A., et al., in Controlled Fusion and Plasma Physics (Proc. 24th Eur. Conf. Berchtesgaden, 1997), Vol. 21A, Part I, European Physical Society, Geneva (1997) 81) to the level of ion neoclassical transport. TRANSP analysis and predictive modelling with JETTO show that this region of improved confinement appears near the plasma centre and then expands outwards in a way which does not follow either the evolution of the region with the negative magnetic shear or the propagation of the region with a large shear in plasma rotation. The best agreement with experiment has been achieved by using a transport model which combines the effect of a long wavelength decoupling due to small magnetic shear with its suppression by strong rotational shear. Predictive modelling of some of the characteristic JET OMS plasmas gives quite good agreement between such a model and the experimental data.",

author = "V.V. Parail and Y.F. Baranov and C.D. Challis and G.A. Cottrell and B.J. Fischer and C. Gormezano and G.T.A. Huysmans and X. Litaudon and A.C.C. Sips and S{\"o}ldner, {F. X.} and E.M. Springmann and A. Taroni and D.J. Ward",

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doi = "10.1088/0029-5515/39/3/310",

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TY - JOUR

T1 - Predictive modelling of JET optimized shear discharges

AU - Parail, V.V.

AU - Baranov, Y.F.

AU - Challis, C.D.

AU - Cottrell, G.A.

AU - Fischer, B.J.

AU - Gormezano, C.

AU - Huysmans, G.T.A.

AU - Litaudon, X.

AU - Sips, A.C.C.

AU - Söldner, F. X.

AU - Springmann, E.M.

AU - Taroni, A.

AU - Ward, D.J.

PY - 1999/3/1

Y1 - 1999/3/1

N2 - Transport analysis of high performance JET plasmas with optimized magnetic shear (OMS) has revealed many interesting features which cannot be explained by the existing JET empirical transport model (Erba, M., et al., Plasma Phys. Control. Fusion 39 (1997) 261). TRANSP analysis shows that transport coefficients in OMS plasmas are often reduced in the plasma core (Cottrell, G.A., et al., in Controlled Fusion and Plasma Physics (Proc. 24th Eur. Conf. Berchtesgaden, 1997), Vol. 21A, Part I, European Physical Society, Geneva (1997) 81) to the level of ion neoclassical transport. TRANSP analysis and predictive modelling with JETTO show that this region of improved confinement appears near the plasma centre and then expands outwards in a way which does not follow either the evolution of the region with the negative magnetic shear or the propagation of the region with a large shear in plasma rotation. The best agreement with experiment has been achieved by using a transport model which combines the effect of a long wavelength decoupling due to small magnetic shear with its suppression by strong rotational shear. Predictive modelling of some of the characteristic JET OMS plasmas gives quite good agreement between such a model and the experimental data.

AB - Transport analysis of high performance JET plasmas with optimized magnetic shear (OMS) has revealed many interesting features which cannot be explained by the existing JET empirical transport model (Erba, M., et al., Plasma Phys. Control. Fusion 39 (1997) 261). TRANSP analysis shows that transport coefficients in OMS plasmas are often reduced in the plasma core (Cottrell, G.A., et al., in Controlled Fusion and Plasma Physics (Proc. 24th Eur. Conf. Berchtesgaden, 1997), Vol. 21A, Part I, European Physical Society, Geneva (1997) 81) to the level of ion neoclassical transport. TRANSP analysis and predictive modelling with JETTO show that this region of improved confinement appears near the plasma centre and then expands outwards in a way which does not follow either the evolution of the region with the negative magnetic shear or the propagation of the region with a large shear in plasma rotation. The best agreement with experiment has been achieved by using a transport model which combines the effect of a long wavelength decoupling due to small magnetic shear with its suppression by strong rotational shear. Predictive modelling of some of the characteristic JET OMS plasmas gives quite good agreement between such a model and the experimental data.

U2 - 10.1088/0029-5515/39/3/310

DO - 10.1088/0029-5515/39/3/310

M3 - Article

SN - 0029-5515

VL - 39

SP - 429

EP - 437

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

ER -

Predictive modelling of JET optimized shear discharges

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