Kumar Harihara Sudhan, Takahashi Masayuki, Kuramitsu Yasuhiro, Ohnishi Naofumi
Department of Aerospace Engineering, Tohoku University, 6-6-01 Aramakiazaaoba, Aoba-ku, Sendai, 980-8579, Japan.
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Sci Rep. 2024 Sep 28;14(1):22531. doi: 10.1038/s41598-024-72623-5.
An optimal target condition for generating GeV-energy ions with linearly polarized laser pulse is revealed by a hybrid acceleration theory based on the fractional contributions of the target normal sheath acceleration (TNSA) and the radiation pressure acceleration (RPA) mechanisms in the RPA-dominant regime. The theory is established with two scaling coefficients, which scale the TNSA and RPA velocities, and are sophisticated through two-dimensional particle-in-cell simulations where GeV-energy ions are obtained by RPA-dominant hybrid acceleration. By imposing limits on the scaling coefficients, three separate acceleration regions are obtained including a RPA-dominant acceleration region, which is optimal to generate GeV-energy ions. The past experiment/simulation results are in good agreement with the acceleration regions obtained. This RPA-dominant region is narrower than previously reported, and this region becomes even narrower with increasing material density.
基于在辐射压力加速（RPA）主导区域中靶面法线鞘层加速（TNSA）和辐射压力加速（RPA）机制的分数贡献的混合加速理论，揭示了用线偏振激光脉冲产生GeV能量离子的最佳靶条件。该理论通过两个缩放系数建立，这两个系数缩放TNSA和RPA速度，并通过二维粒子模拟进行完善，在该模拟中通过RPA主导的混合加速获得GeV能量离子。通过对缩放系数施加限制，获得了三个独立的加速区域，包括一个RPA主导的加速区域，该区域对于产生GeV能量离子是最佳的。过去的实验/模拟结果与获得的加速区域非常吻合。这个RPA主导区域比之前报道的更窄，并且随着材料密度的增加，该区域变得更窄。
