Usage of double-layer targets consisting of heavy and light material with modulated interface between them provides a way for laser-driven generation of collimated ion beams. With extensive 2D3V PIC simulations we show that this configuration may result in a development of a relativistic instability with Rayleigh-Taylor and Richtmyer-Meshkov like features. Initially small perturbations are amplified during the laser-target interaction leading to the formation of low-density plasma regions and high-density bunches between them, which are accelerated by the laser radiation pressure as whole compact structures. That results in collimated quasi-monoenergetic proton beam with high average energy. The properties of this proton beam such as its low emittance (one order of magnitude lower compared to that of conventional accelerators) and divergence are discussed. Results are compared with similar acceleration schemes such as double-layer target without corrugation and single-layer target.

使用由重和轻材料组成的双层靶材，它们之间具有可调节的界面，为激光驱动生成准直离子束提供了一种方法。通过广泛的2D3V PIC仿真，我们证明了这种配置可能导致具有Rayleigh-Taylor和Richtmyer-Meshkov等特征的相对论不稳定性的发展。最初，在激光与目标的交互作用期间会放大较小的扰动，从而在它们之间形成低密度等离子体区域和高密度束，这些密度区域会由于整个整体结构的激光辐射压力而加速。这导致准直的准单能质子束具有较高的平均能量。讨论了该质子束的特性，例如其低发射率（比常规加速器低一个数量级）和发散性。将结果与类似的加速方案进行比较，例如没有波纹的双层靶和单层靶。