正弦三角激光脉冲尾场加速正电子模拟  

Simulation of positron acceleration in the wakefield of sine laser pulses

作　　者：艾尔肯.扎克尔 阿不都热苏力.阿不都热西提 

机构地区：[1]新疆大学物理科学与技术学院,乌鲁木齐830046

出　　处：《激光技术》2013年第1期130-133,共4页Laser Technology

基　　金：新疆大学校院联合基金资助项目(XY110106);国家自然科学基金资助项目(10965008;11164030)

摘　　要：为了研究正弦三角激光脉冲和低密度的等离子体相互作用时加速正电子的运动,采用数值模拟方法进行了数值计算,得到了被加速正电子的动能。结果表明,由于正弦三角激光脉冲激发产生的Raman散射原因,使得被尾场捕获的正电子数增多及相应的初速度增大;非对称正弦三角脉冲的前沿比对称正弦三角脉冲更陡,具有更强的有质动力势,能够产生更强的尾场,因此非对称正弦三角激光脉冲比对称激光脉冲驱动尾场中正电子的能量高。该研究结果说明,非对称正弦三角激光脉冲能够有效地提高正电子的加速效果。In order to study the kinetic energy of the accelerated positron in the laser-driven wakefield induced from the interaction of sine laser pulse and the low density plasma, the kinetic energy of positron in the wakefield driven by the symmetric and asymmetric sine laser pulses was numerically simulated. Numerical results show that the number of the accelerated positrons in the wakefield and their initial speed are increased due to the effect of Raman scattering. Moreover, since the rising part of the asymmetric sine pulse is steeper than the symmetric sine pulse, the positrons obtain a higher pondermotive potential and the asymmetric sine pulse induces a high intensity wakefield. As a result, the kinetic energy of the positrons driven by the asymmetric sine laser pulse is higher than that driven by the symmetric sine laser pulse. These resuhs indicate that the asymmetric sine laser pulse can effectively improve the acceleration efficiency of the positrons.

关 键 词：激光技术 尾场 超短超强激光脉冲 等离子体 第一周期 

分 类 号：O539[理学—等离子体物理]