摘要
合肥红外自由电子激光装置是一台专用于能源化学研究的用户装置,利用一个最高电子能量为60 MeV的S波段直线加速器驱动中红外和远红外两个自由电子激光振荡器,分别产生波长范围为2.5~50μm和40~200μm的红外激光。两个振荡器产生的激光经同一条光束线被传输至实验大厅内的五个实验站。中红外振荡器于2019年调试出光,并于2020年11月达到任务指标。介绍了合肥红外振荡器的自由电子激光装置及其调试进展,重点介绍了中红外振荡器辐射的激光性能。
Objective Under the financial support of Natural Science Foundation of China,a new infrared free-electron laser(FEL)facility,named FELiChEM,is being developed at University of Science and Technology of China in Hefei.It will be a user facility dedicated for energy chemistry research,and will deliver the infrared laser in the spectral range of 2.5-200μm to five research stations.National Synchrotron Radiation Laboratory is responsible for the development of the FEL light source and optical beam line.Methods FELiChEM consists of mid-infrared(MIR)and far-infrared(FIR)free-electron laser oscillators driven by one 60MeV linac.The linac mainly contains:a 100kV electron gun,a 476 MHz subharmonic standing wave prebuncher,a 2856 MHz fundamental frequency traveling-wave buncher and two 2856 MHz fundamental frequency traveling-wave accelerating tubes separated by a magnetic compressor(chicane).Now we have achieved the electron beam with the maximum electron energy of 65MeV,root mean square value of energy spread of less than 240keV,normalized transverse emittance of 20-50mm·mrad and bunch charge of 1.0-1.5nC.The time structure of the electron beam can be easily tuned with the macrobunch width of less than 10μs,macrobunch repetition rate of1-10Hz and optional microbunch repetition rate within 238,119,59.5,29.75 MHz.The two oscillators cover the wavelength ranges of 2.5-50μm and 40-200μm,respectively.In each oscillator,two spherical mirrors with copper base and gold coatings are used to form a symmetrical optical cavity.Two planar permanent-magnet undulators are placed in the center of the two optical cavities.The cavity length for both two oscillators is 5.04m.The infrared radiation is outcoupled from the downstream cavity,which contains multiple mirrors with different outcoupling hole sizes and mechanical conditioners for switching mirrors.Laser beam generated from the two oscillators transports through the same beam line in low vacuum environment(~10^(-2)Pa)to the experimental hall.The total length of the beam line is
作者
李和廷
何志刚
吴芳芳
唐雷雷
赵周宇
张通
何天龙
宣科
张海燕
尉伟
卢平
周泽然
尚雷
刘功发
徐宏亮
何晓业
蒋诗平
裴香涛
高琛
贾启卡
鲍骏
张善才
王琳
Li Heting;He Zhigang;Wu Fangfang;Tang Leilei;Zhao Zhouyu;Zhang Tong;He Tianlong;Xuan Ke;Zhang Haiyan;Wei Wei;Lu Ping;Zhou Zeran;Shang Lei;Liu Gongfa;Xu Hongliang;He Xiaoye;Jiang Shiping;Pei Xiangtao;Gao Chen;Jia Qika;Bao Jun;Zhang Shancai;Wang Lin(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei,Anhui 230029,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing,101408,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2021年第17期1-9,共9页
Chinese Journal of Lasers
基金
国家自然科学基金(21327901,11975233)。
关键词
激光技术
自由电子激光
红外波段
振荡器
laser technique
free-electron laser
infrared band
oscillator
