We report the development of a stable high-average power X-ray source generated by the interaction of ultrashort laser pulses (35 fs, 1 mJ, 1 kHz) with a solid target in air. The achieved source stability, which is essential for the applications foreseen for these laser-driven plasma accelerators, is due to the combination of precise positioning of the target on focus and the development of a fast rotating target system able to ensure the refreshment of the material at every shot while minimizing positioning errors with respect to the focal spot. This vacuum-free laser-plasma X-ray source provides an average dose rate of 1.5 Sv/h at 30 cm and a repeatability better than 93% during more than 36 min of continuous operation per target.

中文翻译：

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改进了紧凑型无真空激光等离子 X 射线源的稳定性

我们报告了由超短激光脉冲（35 fs，1 mJ，1 kHz）与空气中的固体目标相互作用产生的稳定高平均功率 X 射线源的发展。所实现的源稳定性对于这些激光驱动的等离子体加速器的预期应用至关重要，这是由于将目标精确定位在焦点上以及开发能够确保材料更新的快速旋转目标系统的结合每次拍摄，同时最大限度地减少焦点的定位误差。这种无真空激光等离子 X 射线源在 30 cm 处提供 1.5 Sv/h 的平均剂量率，并且在每个目标连续运行超过 36 分钟期间，可重复性优于 93%。