TURBULENT EDGE TRANSPORT IN THE PRINCETON BETA-EXPERIMENT-MODIFIED HIGH CONFINEMENT MODE

被引：73

作者：

TYNAN, GR ^{[1
]}

SCHMIDTZ, L ^{[1
]}

BLUSH, L ^{[1
]}

BOEDO, JA ^{[1
]}

CONN, RW ^{[1
]}

DOERNER, R ^{[1
]}

LEHMER, R ^{[1
]}

MOYER, R ^{[1
]}

KUGEL, H ^{[1
]}

BELL, R ^{[1
]}

KAYE, S ^{[1
]}

OKABAYASHI, M ^{[1
]}

SESNIC, S ^{[1
]}

SUN, Y ^{[1
]}

机构：

[1] PRINCETON UNIV, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08544 USA

来源：

PHYSICS OF PLASMAS | 1994年 / 1卷 / 10期

关键词：

D O I：

10.1063/1.870916

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 first probe measurements of edge turbulence and transport in a neutral beam induced high confinement mode (H-mode) are reported. A strong negative radial electric field is directly observed in H-mode. A transient suppression of normalized ion saturation and floating potential fluctuation levels occurs at the low confinement mode to high confinement mode (L-H) transition, followed by a recovery to near low mode (L-mode) levels. The average poloidal wave number and the poloidal wave-number spectral width are decreased, and the correlation between fluctuating density and potential is reduced. A large-amplitude coherent oscillation, localized to the strong radial electric field region, is observed in H-mode but does not cause transport. In H-mode the effective turbulent diffusion coefficient is reduced by an order of magnitude inside the last closed flux surface and in the scrape-off layer. The results are compared with a heuristic model of turbulence suppression by velocity-shear stabilization.

引用

页码：3301 / 3307

页数：7

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