Abstract

Purpose

Monochromatic hard X-rays with high brightness are desired for medical applications including Auger therapy. One can generate such X-rays through laser-Compton scattering (LCS) by allowing photons from a compact laser system to interact with electrons accelerated by a compact electron accelerator. In this paper, after a brief description of laser-Compton X-ray sources, a scheme called crab crossing to enhance the X-ray intensity is proposed. The effect of crab crossing is evaluated, and we report our dedicated laser system for the crab crossing LCS research.

Materials and methods

The luminosity enhancement factor by crab crossing is evaluated. For the electron beam, a rf deflector will be used to generate a tilted electron beam. For the laser system, chirped pulsed amplification is adopted. Yb-doped optical fibers and a Yb:YAG thin-disk is used for the laser gain media.

Results

The luminosity enhancement factor by crab crossing is expected to be 3.8 when the crossing angle is 45 degrees. 10mJ pulse energy was achieved by thin-disk regenerative amplifier. The pulse duration after the pulse compressor was about 1.5 ps.

Conclusion

We are going to demonstrate the LCS X-ray enhancement by crab crossing of electron beam and laser pulse. The expected enhancement factor is 3.8. We have successfully finished the laser development and the proof-of-principle experiment will be conducted soon.

中文翻译：

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用于螺旋治疗的激光康普顿散射 X 射线增强研究

摘要

目的

包括俄歇疗法在内的医疗应用需要具有高亮度的单色硬 X 射线。通过允许来自紧凑型激光系统的光子与由紧凑型电子加速器加速的电子相互作用，可以通过激光康普顿散射 (LCS) 生成此类 X 射线。在本文中，在简要描述激光-康普顿X射线源之后，提出了一种称为蟹状交叉以增强X射线强度的方案。评估了螃蟹穿越的效果，我们报告了我们用于螃蟹穿越 LCS 研究的专用激光系统。

材料和方法

评估了螃蟹杂交的光度增强因子。对于电子束，射频偏转器将用于产生倾斜的电子束。对于激光系统，采用啁啾脉冲放大。Yb 掺杂光纤和 Yb:YAG 薄盘用于激光增益介质。

结果

当交叉角为 45 度时，螃蟹交叉的光度增强因子预计为 3.8。通过薄盘再生放大器实现了10mJ脉冲能量。脉冲压缩器后的脉冲持续时间约为 1.5 ps。

结论

我们将通过电子束和激光脉冲的偏斜交叉来演示 LCS X 射线增强。预期的增强因子为 3.8。我们已经成功完成了激光器的开发，即将进行原理验证实验。