Foundations for the theory of transport in thermonuclear fusion plasmas

热核聚变等离子体输运理论基础

• 批准号: 15360495
• 负责人: ITOH Kimitaka
• 金额: $ 8.51万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360495/
• 关键词: burning plasmas; transport theory; fluctuation with long correlation length; effect of ignition on transport; meso-scale turbulence; high energy particles; zonal flows; theory of bifurcation in transport; プラズマ乱流; 乱流構造形成; 燃焼プラズマ界面; 乱流輸送係数; 確率遷移

The objective of this research is to form a foundation for the theory of transport of plasmas, in which thermonuclear fusion reaction takes place. In particular, focuses are made upon the issues, for which the burning plasmas show qualitative differences from non-burning plasmas. For instance, the fusion ignition itself could be an origin of plasma turbulence that is responsible for the anomalous transport; fluctuations with long correlation length could have substantial impacts on transport; new type of transport bifurcation could occur in ignited plasmas.The research has made clear-cut contribution for these problems. One example is the transport of fusion-products. It was found that, when the Kubo-number of turbulence is larger than unity, the large-orbit effect of alpha particles enhances (contrary to the conventional knowledge) cross-field transport. Prototypical role of zonal flows, which have long radial correlation length, on the turbulent transport was analyzed thoroughly. Theoretical formula of turbulent transport coefficients, for which the impacts of zonal flows are renormalized, were obtained. A new type of transport bifurcation was also identified; in this transport bifurcation, the radial electric field, zonal flows and energetic particles play essential roles. Thus, this research programme has achieved a firm progress in understanding the turbulent transport in fusion burning plasmas.

这项研究的目的是为等离子体的运输理论构成基础，在该理论中发生热核融合反应。特别是，重点放在问题上，为此，燃烧的等离子体表现出与非燃烧等离子体的质量差异。例如，融合点火本身可能是导致异常运输的血浆湍流的起源。相关长度长的波动可能会对运输产生重大影响；新型的运输分叉可能会在点燃的等离子体中发生。该研究为这些问题做出了明确的贡献。一个例子是融合产品的运输。已经发现，当湍流的库拜数大于统一时，α颗粒的大轨道效应会增强（与常规知识相反）跨场传输。彻底分析了具有长径向相关长度的区域流的原型作用。获得了湍流系数的理论公式，为此，获得了纬向流的影响。还确定了一种新型的运输分叉；在这种传输分叉中，径向电场，纬向流和能量颗粒起着重要的作用。因此，该研究计划在理解融合燃烧等离子体中的动荡运输方面取得了坚定的进步。

项目成果

Two-dimensional structure of plasma flow and particle pinch in tokamak H-mode

托卡马克 H 模式等离子体流和粒子箍缩的二维结构

• 发表时间: 2005
• 期刊: Phys. Rev. Lett Vol.95
• 作者: N.Kasuya;K.Itoh
• 通讯作者: K.Itoh

Selection of a radial wavelength of zonal flows

选择纬向流的径向波长

• 发表时间: 2006
• 期刊: J.Phys.Soc.Jpn. 75
• 作者: S.Toda;K.Itoh;K.Hallatschek;M.Yagi;S.-I.Itoh
• 通讯作者: S.-I.Itoh

Coherent Structure of Zonal Flow and Nonlinear Saturation

• DOI: 10.1143/jpsj.73.2921
• 发表时间: 2003-12
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: K. Itoh;K. Hallatschek;S. Toda;H. Sanuki;S. Itoh

Turbulence and transport characteristics on a barrier in a toroidal plasma

环形等离子体中屏障上的湍流和传输特性

• 发表时间: 2006
• 期刊: Plasma Phys.Contr.Fusion (印刷中)
• 作者: A.Fujisawa;A.Shimizu;H.Nakano;S.Ohsima;K.Itoh;H.Iguchi;Y.Yoshimura;T.Minami;K.Nagaoka;C.Takahashi;M.Kojima;S.Nishimura;M.Isobe;C.Suzuki;T.Akiyama;Y.Nagashima;K.Ida;K.Toi;T.Ido;S.-I.Itoh;K.Matsuoka;S.Okamura;P.H.Diamond
• 通讯作者: P.H.Diamond

On the bicoherence analysis of plasma turbulence

• DOI: 10.1063/1.2062627
• 发表时间: 2005-10
• 期刊: Physics of Plasmas
• 影响因子: 2.2
• 作者: K. Itoh;Y. Nagashima;S. Itoh;P. Diamond;A. Fujisawa;M. Yagi;A. Fukuyama