摘要
强流脉冲离子束辐照后的材料表面状态对束流强度具有极高的敏感性.因此,在辐照实验中监测束流输出的稳定性,并及时识别出参数抖动较大的脉冲,对于实验结果的分析和表面改性效果的优化具有重要意义.本文利用塑料闪烁体构建了一种时间分辨为6 ns的快响应脉冲X射线诊断系统,成功捕获了外磁绝缘离子束二极管工作时产生的X射线.同时,通过红外相机和法拉第筒对离子束流的能量密度和电流密度进行测量.分析结果显示,轫致辐射强度和离子束发射强度均取决于二极管加速电压,导致X射线强度和离子束流能量密度呈现正相关趋势.当离子电流密度发生抖动时,X射线信号幅值表现出良好的变化跟随性,能够对偏离预设参数区间的脉冲做出响应.这说明本文提出的非拦截式诊断方法能够有效地实时监测强流脉冲离子束束流输出的稳定性.
Intense pulsed ion beam(IPIB)technology has made remarkable progress in surface modification,mixing,polishing,film deposition,and nano powder synthesis in recent years.However,the surface properties of materials under IPIB irradiation are highly sensitive to beam intensity variations.Deviations from acceptable parameter range can change the surface characteristics and increase prevalence of defects.Consequently,the real-time online monitoring of beam stability during irradiation experiments and promptly identifying of pulses exhibiting significant parameter jitter are of significance in accurately analyzing results and optimizing surface modification.This study presents a fast-response pulse X-ray diagnostic system by employing EJ-200 plastic scintillator,9266FLB photomultiplier tube,and Tektronic TDS 2024 four-channel oscilloscope.Single particle test demonstrates that the system achieves a time resolution of 6 ns,meeting the requirements for temporal response to detecting pulse X-ray signals with a half-width of~80 ns.By adjusting the insulation magnetic field strength of the ion diode,the IPIB output level is regulated.The diagnostic system successfully captures X-rays emitted by the external magnetic insulated ion diode operating at different output levels.Simultaneously,the ion beam energy density is measured by using an infrared camera.To mitigate diagnostic errors stemming from target ablation,the maximum energy density is controlled to be below 1.32 J/cm^(2).Analysis results establish a positive correlation between X-ray intensity and ion beam energy density.This relationship arises from the influence of the insulating magnetic field adjustment on the diode's operating voltage,which subsequently affects the bremsstrahlung radiant intensity and ion beam emission intensity.This correlation offers the potential for the real-time monitoring of IPIB beam output stability by utilizing X-ray signals.To further corroborate the synchronized changes in pulse X-ray intensity and ion beam intensity,Faraday cup is emp
作者
许莫非
于翔
张世健
Gennady Efimovich Remnev
乐小云
Xu Mo-Fei;Yu Xiang;Zhang Shi-Jian;Gennady Efimovich Remnev;Le Xiao-Yun(School of Physics,Beihang University,Beijing 100191,China;Beijing Advanced Innovation Center for Big Data-based Precision Medicine,Beihang University,Beijing 100191,China;Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics,Beihang University,Beijing 100191,China;National Research Tomsk Polytechnic University,Tomsk 634050,Russia)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第17期268-274,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:12075024)
国防基础科研项目(批准号:12700002022119001)资助的课题.
