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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 acceleration of positron motion when the sinusoidal triangular laser pulse interacts with the low-density plasma, the numerical simulation is used to calculate the kinetic energy of accelerated positrons. The results show that due to the Raman scattering caused by the sinusoidal laser pulse excitation, the number of positrons captured by the tail field increases and the corresponding initial velocity increases. The asymmetric sinusoidal triangular pulse has a steeper front edge than the symmetrical sinusoidal triangular pulse and more Strong momentum, can produce a stronger wake field, so asymmetric sinusoidal laser pulse than the symmetric laser pulse-driven tail field positron energies. The results show that asymmetric sinusoidal laser pulses can effectively enhance the positron acceleration.