On the role of the edge density profile for the L-H transition power threshold in ASDEX Upgrade

被引：31
|
作者：
Shao, L. M. [1 ,2 ]
Wolfrum, E. [1 ]
Ryter, F. [1 ]
Birkenmeier, G. [1 ,3 ]
Laggner, F. M. [4 ]
Viezzer, E. [1 ]
Fischer, R. [1 ]
Willensdorfer, M. [1 ]
Kurzan, B. [1 ]
Lunt, T. [1 ]
机构：
[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
[3] Tech Univ Munich, Phys Dept E28, D-85748 Garching, Germany
[4] TU Wien, Inst Appl Phys, Fus OAW, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2016年 / 58卷 / 02期
关键词：
L-H transition; power threshold; edge density profile; MODE TRANSITION; CONFINEMENT; PHYSICS; EQUILIBRIA; TURBULENCE; TRANSPORT; REGIME;
D O I：
10.1088/0741-3335/58/2/025004
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：
The L-H transition power threshold (PL-H) in full tungsten (W) wall discharges is lower by 25% compared to those with graphite (C) mix tungsten walls in ASDEX Upgrade (Ryter et al 2013 Nucl. Fusion 53 113003). The lower power threshold in the full tungsten wall discharges has been found to correlate with higher edge density as well as steeper edge density gradient. An estimate of the minimum in the neoclassical radial electric field well inside the separatrix yields a constant value for all analyzed L-H transitions at fixed toroidal magnetic field (BT). The decrease of the threshold power is explained by the steeper edge density gradient in the discharges with full tungsten wall.
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页数：11
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