CAJ | 학술논문

在震荡中心哈密顿原理的(oscillation-center Hamiltonian)框架下,讨论了用非对称圆极化的强激光脉冲激发的尾场和在超空泡区中加速正电子的相关问题.研究内容包括:在超强激光所激发的空泡后区中的尾场正电子加速方法和在超空泡区中的雪梨(snow-plow)正电子加速方法.通过理论分析和数值模拟方法定性地比较了2种正电子加速方法的有效加速性能.结果显示,尾场加速的效果比雪梨加速好,2种加速方法中激光脉冲振幅与被加速正电子的能量之间分别存在着指数关系和线性关系.文中还分析了正电子最大尾场和雪梨加速能量与等离子体密度之间的关系.
재진탕중심합밀돈원리적(oscillation-center Hamiltonian)광가하,토론료용비대칭원겁화적강격광맥충격발적미장화재초공포구중가속정전자적상관문제.연구내용포괄:재초강격광소격발적공포후구중적미장정전자가속방법화재초공포구중적설리(snow-plow)정전자가속방법.통과이론분석화수치모의방법정성지비교료2충정전자가속방법적유효가속성능.결과현시,미장가속적효과비설리가속호,2충가속방법중격광맥충진폭여피가속정전자적능량지간분별존재착지수관계화선성관계.문중환분석료정전자최대미장화설리가속능량여등리자체밀도지간적관계.
Analytical and numerical results of positron acceleration in plasma driven by circular polarized ultraintense laser with asymmetric pulse are investigated in terms of oscillation-center Hamiltonian formalism.Studies include wakefield acceleration which dominates in bubble regime and snow-plow acceleration which dominates in supra-bubble regime.By a comparison with each other,it is found that snow-plow acceleration has lower acceleration effciency.The optimal laser parameters as well power and linear scaling laws for wakefield and snow-plow positron acceleration respectively are observed.Moreover,also an upper and lower limit on plasma density for an effective positron acceleration in both of regimes are presented.