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发生热核聚变反应的等离子体输运理论奠定基础。特别是对燃烧等离子体与非燃烧等离子体表现出质的不同的问题进行了重点讨论。例如，聚变点火本身可能是导致反常输运的等离子体湍流的根源；长关联长度的波动可能会对输运产生实质性影响；被点燃的等离子体中可能会出现新型的输运分叉。核聚变产品的运输就是一个例子。结果表明，当湍流的Kubo数大于1时，α粒子的大轨道效应使跨场输运增强(与传统认识相反)。深入分析了径向相关长度较长的纬向流在湍流输运中的典型作用。得到了重整化纬向流影响的湍流输运系数的理论公式。还发现了一种新的输运分叉，在这种输运分叉中，径向电场、纬向流和含能粒子起着至关重要的作用。因此，这一研究计划在理解聚变燃烧等离子体中的湍流输运方面取得了坚实的进展。

项目成果

Coherent structure of zonal flow and onset of turbulent transport

• DOI: 10.1063/1.1922788
• 发表时间: 2005-02
• 期刊: Physics of Plasmas
• 影响因子: 2.2
• 作者: K. Itoh;K. Hallatschek;S. Itoh;P. Diamond;S. Toda

Self-annihilation of magnetic islands in helical plasmas

螺旋等离子体中磁岛的自湮灭

• 发表时间: 2005
• 期刊: Phys. Plasmas Vol.12 No.7
• 作者: K.Itoh;S.-I.Itoh;M.Yagi
• 通讯作者: M.Yagi

Bispectral analysis applied to coherent floating potential fluctuations with geodesic acoustic wave frequency obtained in the edge plasmas on JFT-2M

双谱分析应用于 JFT-2M 边缘等离子体中获得的测地线声波频率的相干浮动电位波动

• 发表时间: 2006
• 期刊: Plasma Phys. Contr. Fusion 48
• 作者: Nagashima;K.Itoh;S.-I.Itoh;A.Fujisawa;K.Hoshino;Y.Takase;M.Yagi;A.Ejiri;K.Ida;K.Shinohara;K.Uehara;Y.Kusama;JFT-2M group
• 通讯作者: JFT-2M group

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

Life time of plasma states near transition boundary

过渡边界附近等离子体态的寿命

• 发表时间: 2005
• 期刊: J. Phys.Soc. Jpn Vol.74 No.3
• 作者: S.-I. Itoh;K. Itoh and M. Yagi
• 通讯作者: K. Itoh and M. Yagi