论文标题
高剂量速率电离辐射源来自MJ级飞秒激光器的空气中的紧密聚焦
High Dose-Rate Ionizing Radiation Source from Tight Focusing in Air of a mJ-class Femtosecond Laser
论文作者
论文摘要
超时电子束具有飞秒至皮秒束的持续时间，为探索从超快结构动力学到超高剂量速率放射生物学研究的主动研究领域提供了独特的机会。我们提出了一种直接的方法，可以通过几个周期的MJ级femtsecond ir激光器的紧密聚焦在环境空气中生成MEV式电子束。在距来源一米处的最高测量剂量率为0.15 Gy/s的剂量率超过了不到一秒钟的年度剂量限制，并保证实施辐射保护。二维粒子中的粒子模拟证实，加速度机制基于相对论的蓬勃发展力，并显示了与测量的电子能量的理论一致性。此外，我们通过MJ级高平均功率激光器的持续发展讨论了这种方法的可伸缩性，此外，还为闪光辐射疗法提供了有希望的方法。
Ultrashort electron beams with femtosecond to picosecond bunch durations offer unique opportunities to explore active research areas ranging from ultrafast structural dynamics to ultra-high dose-rate radiobiological studies. We present a straightforward method to generate MeV-ranged electron beams in ambient air through the tight focusing of a few-cycle, mJ-class femtosecond IR laser. At one meter from the source, the highest measured dose rate of 0.15 Gy/s exceeds the yearly dose limit in less than one second and warrants the implementation of radiation protection. Two-dimensional Particle-In-Cell simulations confirm that the acceleration mechanism is based on the relativistic ponderomotive force and show theoretical agreement with the measured electron energy. Furthermore, we discuss the scalability of this method with the continuing development of mJ-class high average power lasers, moreover providing a promising approach for FLASH radiation therapy.
