各向异性聚焦大动态条纹变像管
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摘要
建立了各向异性聚焦大动态条纹变像管电子光学模型,通过求解整个系统的电场分布对可能的高压打火点进行了分析,研究了电四极透镜对条纹管放大倍率以及静态和动态像质的影响,并计算了该管型的时间畸变.结果表明,在20mm长狭缝的情况下,时间畸变为15ps,在这15ps内,偏转器所施加的扫描电压的变化范围仅为3.06V,因此由时间畸变导致狭缝像弯曲的现象几乎可以忽略.实验测试得该条纹相机的时间分辨可达1.8ps,在时间分辨为8ps时,动态范围超过1 000∶1.
The electron-optical model of high dynamic range anisotropic focusing streak tube is built.Via calculating the electric field distribution and tracking electron beam trajectory of the whole system,high voltage electrodes which may trigger the electric sparks are analyzed;the effect of electric quadrupole lens on the streak tube magnification,static and dynamic image quality are studied;the temporal distortion is calculated.The results show that the temporal distortion in the 20 mm long slit is only 15 ps,in which the variation of the ramp voltage imposed on the deflectors is as small as 3.06 V.Thus,the slit image distortion caused by the temporal distortion can be ignored.The optimum time resolution of 1.8 ps and dynamic range of 1 000∶1 at temporal resolution of 8 ps are successfully demonstrated in the experiments.
The electron-optical model of high dynamic range anisotropic focusing streak tube is built.Via calculating the electric field distribution and tracking electron beam trajectory of the whole system,high voltage electrodes which may trigger the electric sparks are analyzed;the effect of electric quadrupole lens on the streak tube magnification,static and dynamic image quality are studied;the temporal distortion is calculated.The results show that the temporal distortion in the 20 mm long slit is only 15 ps,in which the variation of the ramp voltage imposed on the deflectors is as small as 3.06 V.Thus,the slit image distortion caused by the temporal distortion can be ignored.The optimum time resolution of 1.8 ps and dynamic range of 1 000∶1 at temporal resolution of 8 ps are successfully demonstrated in the experiments.
引文
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[15] FENG J,SHIN H J,NASIATKA J R,et al.An x-ray streak camera with high spatio-temporal resolution[J].Applied Physics Letters,2007,91(13):134102.
[2] ZHAO Yong-tao,XIAO Guo-qing,LI Fu-li,et al.The physics of inertial confinement fusion based on modern accelerators:status and perspectives[J].Physics,2016,45(2):98-107.赵永涛,肖国青,李福利,等.基于现代加速器的惯性约束聚变物理研究现状及发展[J].物理,2016,45(2):98-107.
[3] LI Jing,HU Xin,YANG Pin,et al.Double focusing lens streak tube with wide dynamic range[J].High Power Laserand Particle Beams,2013,25(10):2616-2620.李晋,胡昕,杨品,等.大动态双聚焦条纹变像管设计[J].强激光与粒子束,2013,25(10):2616-2620.
[4] Streak tube[EB/OL].[2018-07-04].https://www.photonis.com/product/streak-tube.
[5] Optoscope SC-20systems[EB/OL].[2018-07-04].https://optronis.com/en/products/optoscope-sc-20-systeme/.
[6] BONTE C,HARMAND M,DORCHIES F,et al.High dynamic range streak camera for subpicosecond time-resolved xray spectroscopy[J].Review of Scientific Instruments,2007,78(4):043503.
[7] ZUBER C,BAZZOLI S,BRUNEL P,et al.Picosecond X-ray streak camera dynamic range measurement[J].Review of Scientific Instruments,2016,87(9):093501.
[8]田进寿,徐向晏,王俊锋,等.各向异性聚焦大动态条纹变像:中国,CN201010574723[P].2011-05-18.
[9] ZHU Min,TIAN Jin-shou,WEN Wen-long,et al.Research on large dynamic range streak camera based on electronbombarded CCD[J].Acta Physica Sinca,2015,64(9):507-514.朱敏,田进寿,温文龙,等.基于电子轰击式CCD的大动态条纹相机研究[J].物理学报,2015,64(9):507-514.
[10] TIAN J S.Development of streak camera with anisotropic focusing electron optical system[C].SPIE.2013:87960Z.
[11] CST-computer simulation technology[EB/OL].[2018-07-04].https://www.cst.com/products/cstps.
[12] WEILAND M C T.Discrete electromagnetism with the finite integration technique[J].Progress in Electromagnetics Research,2001,32:65-87.
[13] QU Jun-le,YANG Qin-lao,NIU Han-ben,et al.A long slit soft x-ray streak camera system[J].High Power Laser and Particle Beams,1997,9(1):114-120.屈军乐,杨勤劳,牛憨笨,等.一种长狭缝软X射线扫描相机系统[J].强激光与粒子束,1997,9(1):114-120.
[14] HUI Dan-dan,TIAN Jin-shou,LU Yu,et al.Temporal distortion analysis of the streak tube[J].Acta Physica Sinca,2016,65(15):158502.惠丹丹,田进寿,卢裕,等.条纹变像管时间畸变的分析[J].物理学报,2016,65(15):158502.
[15] FENG J,SHIN H J,NASIATKA J R,et al.An x-ray streak camera with high spatio-temporal resolution[J].Applied Physics Letters,2007,91(13):134102.