在10-100 PW激光器下,可在微米范围内调节薄膜厚度的辐射压加速的稳定模式
Meng Liu1,2, Wei-Min Wang3,4, Yu-Tong Li1,5,6
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China.
Physical review. E
|February 17, 2024
概括
高强度激光器使用可调节薄膜厚度的辐射压加速 (RPA) 实现高效的质子加速. 这克服了以前的局限性,为未来实验中稳定,多GeV的质子束生成铺平了道路.
科学领域:
- 等离子体物理学的物理学
- 激光驱动的粒子加速器
背景情况:
- 辐射压加速 (RPA) 是产生GeV级质子束的一个有前途的方法.
- 之前的实验观察到,由于薄和激光不完美,质子能量低于预测.
- 确定了上限薄膜厚度 (L_up),低于匹配厚度 (L_mat) 的强度<10^22 W/cm^2,阻碍了高效的RPA.
研究的目的:
- 为了研究薄膜厚度在超高激光强度下的辐射压加速 (RPA) 中的作用.
- 确定GeV级质子高效和稳定的RPA条件.
- 探索未来10-100 PW激光设施的潜力,以实现先进的质子加速.
主要方法:
- 粒子在细胞 (PIC) 模拟被用于模拟激光-片相互作用.
- 分析激光强度,薄膜厚度和质子加速效率之间的相互作用.
- 对于有效的RPA的上限薄膜厚度 (L_up) 的理论推导.
主要成果:
- 在激光强度>= 10^23 W/cm^2时,L_up显著超过L_mat,为高效的RPA创建了一个扩展的,可调节的薄膜厚度范围.
- 在这种扩展的厚度范围内,可以稳步生成多GeV的近同能量质子束.
- 激光强度的增加导致稳定的能量峰值和一致的能量转换效率,尽管薄膜厚度的变化.
结论:
- 超高激光强度解锁了RPA的新制度,具有广泛的,可调节的薄膜厚度窗口.
- 这种制度克服了以前的局限性,使稳定高效的高质量质子束产生成为可能.
- 未来使用10-100 PW激光器的实验有望在激光驱动的质子加速方面取得重大进展.
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