论文标题
研究激光加速质子束的空间电荷力
Study of space charge force for a laser-accelerated proton beam
论文作者
论文摘要
激光加速器可以为质子梁提供独特的品质，例如微米尺寸，皮秒脉冲持续时间和高峰值电流，并用于各种应用和科学研究目的。高峰电流梁中太空电荷力的影响很强，并在光束传输后施加了挑战。我们进行了二维粒子中的模拟，并研究了激光加速后具有接近质子的电子的影响。我们采用了具有不同电荷分布的椭圆形模型来估计空间电荷力的影响。结果表明，如果每个脉冲的质子数量超过1010，则空间电荷会影响光束的传播，甚至会导致完全传输失败。在20 ps之后，太空电荷力的影响大大减小，这对应于距目标约1.2 mm。
Laser accelerators can provide proton beams with unique qualities, such as micron size, picosecond pulse duration and high peak current, and have been demonstrated for various applications and for scientific research purposes. The effect of the space charge force in high peak current beams is strong and raises challenges for application after beam transportation. We performed two-dimensional particle-in-cell simulations and studied the influence of electrons that have velocities close to that of the protons after laser acceleration. We employed ellipsoid models with different charge distributions to estimate the effects of the space charge force. Results demonstrate that space charge will affect beam transmission, and even lead to complete transmission failure if the number of protons per pulse exceeds 1010. The influence of the space charge force diminishes greatly after 20 ps, which corresponds to approximately 1.2 mm from the target.
