Predictive modelling of JET optimized shear discharges

被引：45

作者：

Parail, VV ^{[1
]}

Baranov, YF ^{[1
]}

Challis, CD ^{[1
]}

Cottrell, GA ^{[1
]}

Fischer, B ^{[1
]}

Gormezano, C ^{[1
]}

Huysmans, GTA ^{[1
]}

Litaudon, X ^{[1
]}

Sips, ACC ^{[1
]}

Söldner, FX ^{[1
]}

Springmann, EM ^{[1
]}

Taroni, A ^{[1
]}

Ward, DJ ^{[1
]}

机构：

[1] Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England

来源：

NUCLEAR FUSION | 1999年 / 39卷 / 03期

关键词：

D O I：

10.1088/0029-5515/39/3/310

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 fur. 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.

引用

页码：429 / 437

页数：9

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