Nonlinear transfer in heated L-modes approaching the L-H transition threshold in Alcator C-Mod

被引：22

作者：

Cziegler, I. ^{[1
]}

Tynan, G. R. ^{[1
]}

Diamond, P. H. ^{[1
]}

Hubbard, A. E. ^{[2
]}

Hughes, J. W. ^{[2
]}

Irby, J. ^{[2
]}

Terry, J. L. ^{[2
]}

机构：

[1] Univ Calif San Diego, Ctr Momentum Transport & Flow Org, La Jolla, CA 92093 USA

[2] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

NUCLEAR FUSION | 2015年 / 55卷 / 08期

关键词：

turbulence; L-H transition; nonlinearity; PLASMA;

D O I：

10.1088/0029-5515/55/8/083007

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：

Nonlinear transfer processes between large-scale edge flows and the ambient broadband fluctuations have been shown to play a significant role in the dynamics of edge turbulence, including spreading power from coherent modes and suppressing turbulence at the formation of edge transport barriers. In order to predict thresholds of confinement regimes, both the transition dynamics and the parametric dependence of the nonlinear energy transfer must be studied. Since the expected flow damping terms depend on ion collision rates and local safety factors, recent experiments aimed also to explore the nonlinear drive at various values of the plasma current, density and amount of auxiliary heating. Nonlinear interactions between zonal flows and turbulence in L-mode are estimated using bispectral as well as time-resolved methods based on gas-puff-imaging in Alcator C-Mod [1].

引用

页数：9

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