Reduction of turbulent transport with zonal flows enhanced in helical systems

被引：80

作者：

Watanabe, T. -H. ^{[1
,2
]}

Sugama, H. ^{[1
,2
]}

Ferrando-Margalet, S. ^{[1
]}

机构：

[1] Natl Inst Fus Sci Toki, Gifu 5095292, Japan

[2] Grad Univ Adv Studies Sokendai, Gifu 5095292, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.100.195002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Gyrokinetic Vlasov simulations of the ion temperature gradient turbulence are performed in order to investigate effects of helical magnetic configurations on turbulent transport and zonal flows. The obtained results confirm the theoretical prediction that helical configurations optimized for reducing neoclassical ripple transport can simultaneously reduce the turbulent transport with enhancing zonal-flow generation. Stationary zonal-flow structures accompanied with transport reduction are clearly identified by the simulation for the neoclassically optimized helical geometry. The generation of the stationary zonal flow explains a physical mechanism for causing the confinement improvement observed in the inward-shifted plasma in the Large Helical Device [O. Motojima , Nucl. Fusion 43, 1674 (2003)].

引用

页数：4

共 21 条

[1]

[Anonymous], 1969, ELECTRODYNAMICS PART

[2] FIELD-ALIGNED COORDINATES FOR NONLINEAR SIMULATIONS OF TOKAMAK TURBULENCE [J].

BEER, MA ;

COWLEY, SC ;

HAMMETT, GW .

PHYSICS OF PLASMAS, 1995, 2 (07) :2687-2700

[3] 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

[4] Zonal flows and ion temperature gradient instabilities in multiple-helicity magnetic fields [J].

Ferrando-Margalet, S. ;

Sugama, H. ;

Watanabe, T. -H. .

PHYSICS OF PLASMAS, 2007, 14 (12)

[5] 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

[6] Drift waves and transport [J].

Horton, W .

REVIEWS OF MODERN PHYSICS, 1999, 71 (03) :735-778

[7] Ion temperature gradient modes in toroidal helical systems [J].

Kuroda, T ;

Sugama, H ;

Kanno, R ;

Okamoto, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2000, 69 (08) :2485-2492

[8] Turbulent transport reduction by zonal flows: Massively parallel simulations [J].

Lin, Z ;

Hahm, TS ;

Lee, WW ;

Tang, WM ;

White, RB .

SCIENCE, 1998, 281 (5384) :1835-1837

[9] Recent advances in the LHD experiment [J].

Motojima, O ;

Ohyabu, N ;

Komori, A ;

Kaneko, O ;

Yamada, H ;

Kawahata, K ;

Nakamura, Y ;

Ida, K ;

Akiyama, T ;

Ashikawa, N ;

Cooper, WA ;

Ejiri, A ;

Emoto, M ;

Ezumi, N ;

Funaba, H ;

Fukuyama, A ;

Goncharov, P ;

Goto, M ;

Idei, H ;

Ikeda, K ;

Inagaki, S ;

Isobe, M ;

Kado, S ;

Kawazome, H ;

Khlopenkov, K ;

Kobuchi, T ;

Kondo, K ;

Kostrioukov, A ;

Kubo, S ;

Kumazawa, R ;

Liang, Y ;

Lyon, JF ;

Mase, A ;

Masuzaki, S ;

Minami, T ;

Miyazawa, J ;

Morisaki, T ;

Morita, S ;

Murakami, S ;

Muto, S ;

Mutoh, T ;

Nagaoka, K ;

Nagayama, Y ;

Nakajima, N ;

Nakamura, K ;

Nakanishi, H ;

Narihara, K ;

Narushima, Y ;

Nishimura, K ;

Nishino, N .

NUCLEAR FUSION, 2003, 43 (12) :1674-1683

[10] Neoclassical transport optimization of LHD [J].

Murakami, S ;

Wakasa, A ;

Maassberg, H ;

Beidler, CD ;

Yamada, H ;

Watanabe, KY .

NUCLEAR FUSION, 2002, 42 (11) :L19-L22

← 1 2 3 →