Analysis of bifurcation phenomena in the electron internal transport barrier in the large helical device

被引：20

作者：

García, J

Yamazaki, K

Dies, J

Izquierdo, J

机构：

[1] Univ Politecn Cataluna, ETSEIB, Dept Fis & Engn Nucl, FEEL, Barcelona, Spain

[2] Nagoya Univ, Chikusa Ku, Nagoya, Aichi 4648603, Japan

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.96.105007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electron internal transport barrier (eITB) formation in the Large Helical Device (LHD) is studied with the transport code TOTAL and a GyroBohm-like model. The reduction of anomalous transport by the ExB shear has been introduced by means of the factor [1+(tau omega(ExB))(gamma)](-1). Simulation results show a clear critical transition between plasma regimes with rather flat electron temperature profiles (non-eITB) to a steeped one (with eITB) when average density is low enough. With the aim of studying the eITB formation as a phase transition phenomenon, the electron average density is taken as the control parameter and the ExB shearing rate as the order parameter. Results show how the eITB formation in LHD is compatible with a continuum phase transition with critical exponent beta=0.40.

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页码：1 / 4

页数：4

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