摘要
激光核聚变的"快点火"过程中高能电子的产生会引起相对论性静电双流不稳定性,它对相对论性电子的传输和能量沉积有重要影响。从完全协变相对论性电磁流体力学方程出发,研究了相对论性冷电子束流激发的静电双流不稳定性。研究表明,快电子束流速度越大,对不稳定的增长率和不稳定区域的抑制性越强,即相对论性越强,越能抑制双流不稳定性的产生;而快电子束密度越大,越易于引发双流不稳定性;随着快电子束流速度以及束流密度的增大,不稳定性最大增长率都向小波数区域移动。
The relativistic electrostatic two-stream instability can take place in the fast ignition process of in- ertial confinement fusion, which has an important influence on the fast electron propagation and energy deposition. From the full covariant relativistic hydrodynamic equations of electromagnetism,the relativistic electrostatic two-stream instability has been investigated both （delete） analytically and numerically. The dispersion relation for cold relativistic electron beams was derived. The numerical results indicated that a- long with the fast-electron beam density increasing,the electron two-stream instability growth rate would become larger,while the unstable range would become smaller and shift to the smaller wave number re- gion. By contrast, as the speed of fast stream increases, the growth rate and unstable region decrease. In brief, the two-stream instability is restrained.
出处
《南昌大学学报（理科版）》
CAS
北大核心
2012年第1期35-37,42,共4页
Journal of Nanchang University(Natural Science)
基金
国家自然科学基金资助项目(11105066)
中国科学技术部国际科技合作项目(2009DFA02320)
江西省优势创新团队计划资助项目(2010DQB00900)
江西省自然科学基金项目(20114BAB202006)
关键词
双流不稳定性
协变流体方程
色散关系
增长率
two-stream instability
relativistic fluid equation
dispersion relation
growth rate
