We investigate the parameters of accelerated electron bunch in laser wakefield acceleration (LWFA), when a skewed laser pulse propagates through a plasma in the presence of a transverse magnetic field. Two dimensional particle-in-cell (2D-PIC) simulations have been performed under the consideration of pulse skewness parameter $(s_{\alpha }={\tau }_l/{\tau }_t)$ that is defined as the ratio of leading $\left({\tau }_l\right)$ to trailing pulse edge $\left({\tau }_t\right)$ duration. The injected charge is estimated as 23 pC for the laser strength parameter $a_0=2$ when $s_{\alpha }$ changes from 1 to 0.45 at a laser propagation distance of 1.5 mm with 50T magnetic field. The electron beam emittance reduces about 50% when leading edge of the pulse becomes two-fold sharper $(s_{\alpha }=0.45)$ with 50T magnetic field. Energy spread of accelerated electron bunch is also reduced from 18 to 6.6%. Hence, in the presence of a transverse magnetic field, the laser pulse skewness can significantly improve the quality of the accelerated electron bunch (i.e. charge, mean energy and emittance) in laser wakefield acceleration.

当偏斜的激光脉冲在存在横向磁场的情况下通过等离子体传播时，我们研究了在激光尾波加速（LWFA）中加速电子束的参数。在考虑脉冲偏斜参数的情况下进行了二维单元格内粒子（2D-PIC）仿真$（s_{\alpha }={\tau }_{升}/{\tau }_{Ť}）$ 定义为领先的比率 $（{\tau }_{升}）$ 到脉冲后沿 $（{\tau }_{Ť}）$期间。对于激光强度参数，注入的电荷估计为23 pC${\mathrm{一个}}_0=\mathrm{2个}$ 什么时候 $s_{\alpha }$在50T磁场下，激光传播距离为1.5 mm时，从1变为0.45。当脉冲的前沿变得更清晰时，电子束发射率降低约50％$（s_{\alpha }=0.45）$具有50T磁场。加速电子束的能量扩散也从18降低到6.6％。因此，在存在横向磁场的情况下，激光脉冲偏斜度可以显着提高激光尾场加速中加速电子束的质量（即电荷，平均能量和发射率）。