Theoretical Research on Relativistic Interaction of Ultra-Intense Laser Light with High Density Plasmas

超强激光与高密度等离子体相对论相互作用的理论研究

• 批准号: 10680464
• 负责人: NISHIKAWA Kyoji
• 金额: $ 2.11万
• 依托单位: Kinki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680464/
• 关键词: Plasma; Laser; Relativistic Effects; Nonlinear Wave Propagation; Instabilities; Computer Simulation; Laser Fusion; Energetic Particle Generation; 非線系波動伝播; 非線型波動伝播; 計算機シミュレーッション

This work consists of analytical and computational researches both being conducted by active international collaborations.Analytical Research : A general theory was constructed on the one-dimensional stationary propagation of a high intensity circularly-polarized electromagnetic wave by relativistic effects in over-critical density plasmas. Propagation characteristics of a short pulse laser light is analysed using a kinetic equation for the spectral function of electromagnetic waves and general dispersion relation for electromagnetic waves is derived with full account of relativistic effects. A non-potential ponderomotive force is derived and its generation of low frequency magnetic fields and the resulting electron eddy and plasma jet formation are demonstrated.Computational Research : 2-dimensional simulation for relativistic interaction of laser light with nonuniform plasmas is conducted and production of MeV energy plasma particles is confirmed. Electromagnetic waves trapped in a local density cavity is emitted as bursts and stochastic acceleration of electrons due to resonance with the light field is demonstrqated. 2- and 3-dimensional simulations are carried out on the relativistic interaction of ultra-high intensity laser pulse with slowly nonuniform plasma. Laser propagation channels are produced by self-focusing or filamentation and electron acceleration, various instabilities, current sheets formation, generation of quasi-static magnetic fields, their splitting into filaments and their merging, anomalous transport of fast electron current across magnetic fields and resulting current neutralization with the return current are demonstrated. Anomalous heating of the background plasma by an anomalous resistivity is also disclosed.

项目成果

Takeshi Takaishi et al.: "Charge Variation Effects on Ion Acoustic Waves in Dusty Plasmas"Journal of Physical Society of Japan. 68. 2962-2964 (1999)

Takeshi Takaishi 等：“电荷变化对尘埃等离子体中离子声波的影响”日本物理学会杂志。

田中和夫: "Evidence of Relativistic Laser Beam Filamentation in Back Reflected Images"Physical Review E. 62. 2672-2677 (2000)

Kazuo Tanaka：“背反射图像中相对论激光束丝的证据”物理评论 E. 62. 2672-2677 (2000)

Leaven N.Tsintsadze: "Generation of Low-Frequency Electromagnetic Waves by Spectrally Broad Intense Laser Pulse in a Plasma"Physica Scripta. T84. 94-97 (2000)

Leaven N.Tsintsadze：“通过等离子体中的光谱宽强激光脉冲产生低频电磁波”Physica Scripta。

H.Ruhl: "Collimated Electron Jets by Intense Laser-Beam-Plasma Surface Interaction under Oblique Incidence" Physical Review Letters. 82・2. to be published (1999)

H.Ruhl：“斜入射下强激光束-等离子体表面相互作用的准直电子射流”物理评论快报 82・2 即将出版。

高石武史: "Charge Variation Effects on Ion Acoustic Waves in Dusty Plasmas"Jounral of Physical Society of Japan. 68. 2962-2964 (1999)

Takeshi Takaishi：“电荷变化对尘埃等离子体中离子声波的影响”日本物理学会杂志 68。2962-2964（1999）