重庆工商大学学报（自然科学版）2024，Vol.41Issue(5)：80-86,7.DOI:10.16055/j.issn.1672-058X.2024.0005.010
皮秒激光驱动微丝靶产生的超热电子能谱实验研究
Experimental Study on Ultra-thermal Electron Spectrum Generated by Picosecond Laser-driven Microwire Targets
摘要
Abstract
Objective In response to the problem of excessive divergence angle of the ultra-thermal electron beam and insufficient brightness of the generated X-ray source in laser-irradiated planar targets,a high-power picosecond laser was proposed to irradiate the microwire targets and the effects of electron recirculation on the characteristics of ultra-thermal electron beam and X-ray source were studied.Methods The experiment was carried out on the XGIII laser device.The molybdenum with a diameter of 10 μm and gold microwire targets were used as X-ray sources.A pinhole camera was used to measure the X-ray focal spot in the direction of laser reflection,and an electron magnetic spectrometer was arranged in the normal direction of the target to measure the ultra-thermal electron energy spectrum of the escaped hot electron from the target.Results The minimum size of the X-ray focal spot obtained by the pinhole camera reached 10 μm,which was equivalent to the diameter of the wire target.The ultra-thermal electron energy spectrum results showed that the maximum temperatures in the self-sustaining independent molybdenum wire and gold wire were 863 keV and 816 keV,respectively,which were higher compared with the corresponding temperatures and quantities of ultra-thermal electrons in wire targets with CH substrates.Conclusion The experimental results show that removing the low-density substrate of the support wire target is an effective way to accelerate the electron recirculate effect.In this way,the intensity and concentration of the ultra-thermal electron beam can be improved,which enhances the X-ray bremsstrahlung radiant intensity,thus obtaining micro-focus and high-brightness X-ray sources.关键词
皮秒激光/超热电子能谱/微丝靶/X光源/电子加速机制Key words
picosecond laser/ultra-thermal electron spectrum/microwire target/X-ray source/electron acceleration mechanism分类
数理科学引用本文复制引用
罗笔瀚,王洪建,罗登成,冯永祯..皮秒激光驱动微丝靶产生的超热电子能谱实验研究[J].重庆工商大学学报（自然科学版）,2024,41(5):80-86,7.基金项目
国家自然科学基金委员会-中国工程物理研究院联合基金项目(U2030120) （U2030120）
重庆工商大学研究生科研创新项目(YJSCXX2022-112-56). （YJSCXX2022-112-56）
