Creation of hot dense highly charged plasma is key to realizing novel radiation sources, e.g., high Z ion beams and intense hard X-rays. We study the formation of dense silver plasma driven by an ultrashort petawatt laser using one-dimensional Particle-in-Cell (PIC) simulations take into account physics of collisional energy transport, ionizations, and radiations byproducts. For this purpose, we implemented the algorithm of radiation energy loss in hot plasmas enabling self-consistent PIC simulations of the silver plasma formation with radiation cooling. We demonstrated the highly charged silver plasma formation with a pressure of ~ 10 petapascal by irradiating a petawatt laser with peak intensity of 10²¹ W/cm² in 30 femtoseconds. The energy stored in the hot silver plasma is released as hard X-rays photons in a few picosecond time scale with radiation intensity of 10¹⁷ W/cm². The energy conversion from the laser to the emitted X-rays reaches ~ 10%.

创建高密度的热密等离子体是实现新型辐射源（例如高Z离子束和强硬X射线）的关键。我们使用一维单元内粒子（PIC）模拟研究了由超短petawatt激光器驱动的致密银等离子体的形成，该模拟考虑了碰撞能量传输，电离和辐射副产物的物理作用。为此，我们实现了热等离子体中辐射能量损失的算法，从而能够通过辐射冷却对银等离子体的形成进行自洽的PIC模拟。我们通过照射峰值强度为10 ²¹  W / cm ^2的petawatt激光，证明了压力约为10 petapascal的高电荷银等离子体的形成。在30飞秒内 存储在热银等离子体中的能量在几皮秒的时间尺度内以10 ¹⁷  W / cm ^2的辐射强度作为硬X射线光子释放。从激光到发射的X射线的能量转换达到〜10％。