-
面向基础科学与空间应用研究领域对小型化超快脉冲X射线发射源的需求, 设计并研制了基于激光调制光源与光电阴极X射线管的超快脉冲X射线发生器, 解决了传统X射线调制发射装置重复频率低、时间稳定性差、脉冲特性差等应用难题. 本文主要开展了脉冲X射线发生器的超快调制控制模块研究, 并利用基于预调制的激光控制光源实现了高时间精度、高时间稳定度的超快时变光子信号以及纳秒脉冲X射线产生. 理论方面, 建立了脉冲X射线发生器时间响应模型, 分析了出射脉冲X射线的时域时间特性. 实验方面, 搭建了基于超快闪烁体探测器的脉冲X射线时间特性实验测试系统, 测试了激光控制光源及脉冲X射线发射源的时间特性参数. 实验结果表明脉冲X射线发生器可同时实现高重频(12.5 MHz)、超快脉冲(4 ns)、高时间稳定度(400 ps)特性, 且与所建立的理论模型高度符合. 相比于传统X射线调制方案, 脉冲时间参数指标得到了大幅提升、应用场景获得了极大拓展, 本项研究有望为实现超高时间稳定性、超快脉冲X射线发射源提供新思路.In response to the growing demand for miniaturized ultrafast pulsed X-ray sources in the fields of fundamental science and space applications, we design and develop an ultrafast pulsed X-ray generator based on a laser-modulated light source and a photoelectric cathode. This innovative technology addresses the limitations commonly encountered in traditional X-ray emission devices, such as low repetition rate, insufficient time stability, and suboptimal pulse characteristics.Our effort is to study and develop the ultrafast modulation control module for the pulsed X-ray generator. This effort results in achieving high levels of time accuracy and stability in ultrafast time-varying photon signals. Moreover, we successfully generate nanosecond pulsed X-rays by using a laser-controlled light source.Theoretically, we establish a comprehensive time response model for the pulsed X-ray generator in response to short pulses. This includes a thorough analysis of the time characteristics of the emitted pulsed X-rays in the time domain. Experimentally, we conduct a series of tests related to various time-related parameters of the laser-controlled light source. Additionally, we design and implemente an experimental test system for assessing the time characteristics of pulsed X-rays, by using an ultrafast scintillation detector.The experimental results clearly demonstrate that our pulsed X-ray generator achieves impressive capabilities, including high repetition rates (12.5 MHz), ultrafast pulses (4 ns), and exceptional time stability (400 ps) in X-ray emission. These results closely align with our established theoretical model. Compared with traditional modulation techniques, our system exhibits significant improvement in pulse time parameters, thereby greatly expanding its potential applications.This research provides a valuable insight into achieving ultra-high time stability and ultrafast pulsed X-ray emission sources. These advances will further enhance the capabilities of X-ray technology for scientific research and space applications.
-
Keywords:
- pulsed X-ray generator /
- photoelectric cathode X-ray tube /
- laser-controlled light source /
- ultrafast scintillation detector
搜索
x
中国物理学会期刊
下载: