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Formation of Plasma Structure by Cross-Field Particle Acceleration and Potential Formation

通过交叉场粒子加速和电势形成形成等离子体结构

基本信息

批准号：
16540449
负责人：
SUGAYA Reiji
金额：
$ 0.96万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540449/
关键词：
Magnetized plasma Nonlinear plasma wave Cross-field particle acceleration Dynamo effect Potential formation Plasma transport Turbulent diffusion Plasma structure formation

项目摘要

I.The numerical analysis of the plasma structure formation was performed as follows :(1)The magnetohydrodynamic equations incorporating the transport equations and the anomalous diffusion due to the turbulent plasma wave are solved numerically on the basis of the three-dimensional modeling. The transport equations show the cross-field acceleration and heating of plasma electrons. The temporal evolution of the three-dimensional profiles of the cross-field electric field, the drift velocity of plasma electrons and the electron temperature and density was clarified in detail.(2)It was verified that the parallel and perpendicular electron transport generates a large and abrupt dip of the electron density and a strong peak of the electron temperature in the radial direction. At the same time the cross-field electric field is produced partially by the cross-field electron transport and partially by the perpendicular pressure gradient, that is, it is given by the generalized Ohm's law E_⊥ = B … More _O x v_<e⊥>/ c - (*_⊥p_e ) / en_e (p_e = n_ek_BT_e). Namely it was proved that the electron heating region like the electron hole is created by the cross-field transport of plasma electrons (J.Plasma Fusion Res.SERIES, Vol.6, pp.253-255 (2004)).(3)The large amplitude electrostatic waves generate the turbulent diffusion across the magnetic field. This anomalous diffusion of plasma electrons into the central region of the plasma competes with the cross-field electron transport. It was shown that the electron heating region like the electron hole vanishes finally via this turbulent diffusion. The obtained results agree with the experimental observation qualitatively and quantitatively.(4)It was found that this method of the numerical analysis of the electron transport in the electron beam-plasma system is available to the theoretical study of the formation of the transport barrier in a fusion plasma.II.It was verified theoretically and numerically that the relativistic electron beam with the energy lower than 1 GeV can be accelerated efficiently via the Compton scattering of the extraordinary wave in the magnetized plasma (J.Plasma Phys.Vol.70, Part3, pp.331-357 (2004))III.It was verified theoretically and numerically that the relativistic electron beam with the energy lower than 5 TeV can be accelerated efficiently via the Compton scattering of the lower-hybrid wave in the magnetized plasma (Phys.Plasmas Vol.12, pp.5634-5642 (2004) ; 2004 ICPP, Nice, P2-047 (2004)). Less

对等离子体结构的形成进行了如下数值分析：(1)在三维模型的基础上，数值求解了磁流体力学方程组和湍流等离子体波引起的反常扩散方程。输运方程显示了等离子体电子的跨场加速和加热。详细分析了等离子体中交叉场电场、电子漂移速度、电子温度和密度的三维分布随时间的演化。(2)验证了电子的平行和垂直输运在径向产生了一个大而陡峭的电子密度凹陷和电子温度的强峰。同时，交叉场电场部分由交叉场电子输运产生，部分由垂直压力梯度产生，即由广义欧姆定律E_⊥=B_…给出More_O x v_&lt；e⊥&gt；/c-(*_⊥p_e)/en_e(p_e=n_ek_BT_e)。也就是说，证明了像电子空穴一样的电子加热区是由等离子体电子的跨场输运产生的(《等离子体聚变研究》，第6卷，第253-255页(2004))。(3)大幅度的静电波产生了穿过磁场的湍流扩散。等离子体电子进入等离子体中心区域的这种反常扩散与跨场电子传输竞争。结果表明，通过这种湍流扩散，类似电子空穴的电子加热区最终消失。(4)电子束-等离子体系统中电子输运的数值分析方法可用于聚变等离子体输运势垒形成的理论研究。(2)从理论和数值上验证了能量小于1GeV的相对论电子束在磁化等离子体中的康普顿散射可以有效地加速能量低于1GeV的相对论电子束(《等离子体物理杂志》第70卷第3部分)。331-357页(2004)III.理论和数值验证了能量低于5TeV的相对论电子束可以通过磁化等离子体中低杂波的康普顿散射有效地加速(物理等离子体卷12，第5634-5642页(2004)；2004年ICPP，尼斯，P2-047(2004))。较少