Properties of turbulence and stationary zonal flow on transport barrier in CHS

被引：16

作者：

Fujisawa, A. ^{[1
]}

Shimizu, A.

Nakano, H.

Ohsima, S.

Itoh, K.

Iguchi, H.

Matsuoka, S.

Okamura, S.

Itoh, S-I

Diamond, P. H.

机构：

[1] Natl Inst Fus Sci, Oroshi, Toki 50952, Japan

[2] Kyushu Univ, RIAM, Kasuga, Fukuoka 816, Japan

[3] Univ Calif San Diego, La Jolla, CA 92093 USA

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2006年 / 48卷

关键词：

D O I：

10.1088/0741-3335/48/5A/S36

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：

Spectral changes in electric field fluctuation are measured using twin heavy ion beam probes in compact helical system (CHS) before and after an internal transport barrier is broken down. Wavelet analysis reveals intermittent behaviour of the fluctuations and a significant correlation between fluctuation powers of the low (2.5 < f < 10 kHz) and high (30 < f < 250 kHz) ranges. The high frequency (turbulence) fluctuation increases with a decrease in the low frequency fluctuation after the back-transition. The change in the power distribution between these two frequency ranges may contribute to the improved transport on the barrier.

引用

收藏

页码：A365 / A370

页数：6

相关论文

共 14 条

[1] INFLUENCE OF SHEARED POLOIDAL ROTATION ON EDGE TURBULENCE [J].

BIGLARI, H ;

DIAMOND, PH ;

TERRY, PW .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1990, 2 (01) :1-4

[2] Zonal flows in plasma - a review [J].

Diamond, PH ;

Itoh, SI ;

Itoh, K ;

Hahm, TS .

PLASMA PHYSICS AND CONTROLLED FUSION, 2005, 47 (05) :R35-R161

[3] Identification of zonal flows in a toroidal plasma [J].

Fujisawa, A ;

Itoh, K ;

Iguchi, H ;

Matsuoka, K ;

Okamura, S ;

Shimizu, A ;

Minami, T ;

Yoshimura, Y ;

Nagaoka, K ;

Takahashi, C ;

Kojima, M ;

Nakano, H ;

Ohsima, S ;

Nishimura, S ;

Isobe, M ;

Suzuki, C ;

Akiyama, T ;

Ida, K ;

Toi, K ;

Itoh, SI ;

Diamond, PH .

PHYSICAL REVIEW LETTERS, 2004, 93 (16) :165002-1

[4] Experimental studies of structural bifurcation in stellarator plasmas [J].

Fujisawa, A .

PLASMA PHYSICS AND CONTROLLED FUSION, 2003, 45 (08) :R1-R88

[5] Electron thermal transport barrier and density fluctuation reduction in a toroidal helical plasma [J].

Fujisawa, A ;

Iguchi, H ;

Minami, T ;

Yoshimura, Y ;

Sanuki, H ;

Itoh, K ;

Lee, S ;

Tanaka, K ;

Yokoyama, M ;

Kojima, M ;

Itoh, SI ;

Okamura, S ;

Akiyama, R ;

Ida, K ;

Isobe, M ;

Morita, S ;

Nishimura, S ;

Osakabe, M ;

Shimizu, A ;

Takahashi, C ;

Toi, K ;

Hamada, Y ;

Matsuoka, K ;

Fujiwara, M .

PHYSICAL REVIEW LETTERS, 1999, 82 (13) :2669-2672

[6] Transport control by coherent zonal flows in the core/edge transitional regime [J].

Hallatschek, K ;

Biskamp, D .

PHYSICAL REVIEW LETTERS, 2001, 86 (07) :1223-1226

[7] CONFINEMENT IMPROVEMENT IN H-MODE-LIKE PLASMAS IN HELICAL SYSTEMS [J].

ITOH, K ;

ITOH, SI ;

FUKUYAMA, A ;

SANUKI, H ;

YAGI, M .

PLASMA PHYSICS AND CONTROLLED FUSION, 1994, 36 (01) :123-129

[8] Observation and characterization of radially sheared zonal flows in DIII-D [J].

McKee, R ;

Fonck, RJ ;

Jakubowski, M ;

Burrell, KH ;

Hallatschek, K ;

Moyer, RA ;

Nevins, W ;

Rudakov, DL ;

Xu, X .

PLASMA PHYSICS AND CONTROLLED FUSION, 2003, 45 :A477-A485

[9] Poloidal flow driven by ion-temperature-gradient turbulence in tokamaks [J].

Rosenbluth, MN ;

Hinton, FL .

PHYSICAL REVIEW LETTERS, 1998, 80 (04) :724-727

[10] Experimental evidence of self-regulation of fluctuations by time-varying flows [J].

Shats, MG ;

Solomon, WM .

PHYSICAL REVIEW LETTERS, 2002, 88 (04) :4