Gustafsson Cornelia, Löfquist Erik, Svendsen Kristoffer, Angella Andrea, Persson Anders, Lundh Olle
Department of Physics, Lund University, P.O. Box 118, Lund, 22100, Sweden.
Sci Rep. 2024 Nov 1;14(1):26286. doi: 10.1038/s41598-024-78143-6.
Electrons from a laser wakefield accelerator have a limited energy gain due to dephasing and are prone to emittance growth, causing a large divergence. In this paper, we experimentally show that adjusting the plasma density profile can address both issues. Shock-assisted ionisation injection is used to produce 100 MeV quasi-monoenergetic electron bunches in the primary part of the accelerator. Downstream from the accelerator, a second, independently tuneable density region is added, which can be used to either boost the energy of the electron bunches or as a plasma lens for significant divergence reduction. An additional energy gain of 25% and a 40% divergence reduction are obtained. Theoretical models validate the effects.
来自激光尾场加速器的电子由于相位失配而能量增益有限，并且容易出现发射度增长，导致发散度很大。在本文中，我们通过实验表明，调整等离子体密度分布可以解决这两个问题。利用激波辅助电离注入在加速器的初级部分产生100 MeV的准单能电子束。在加速器下游，增加了第二个可独立调谐的密度区域，该区域可用于提高电子束的能量，或用作等离子体透镜以显著降低发散度。实现了25%的额外能量增益和40%的发散度降低。理论模型验证了这些效果。
