微通道板选通X射线皮秒分幅相机  

PECOSECOND X-RAY FKAMING CAMERA USING GATED MCP

作　　者：常增虎[1] 山冰[1] 刘秀琴[1] 杨鸿儒[1] 朱文华 刘进元[1] 侯继东 龚美霞[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室

出　　处：《光子学报》1995年第6期501-508,共8页Acta Photonica Sinica

基　　金：国家攀登计划资助项目

摘　　要：本文报道的超高速摄影机可在１．２ｎｓ内连续拍摄１２幅图象，每幅图象的曝光时间为１００ｐｓ，空间分辨率２０１ｐ／ｍｍ，它具有几何畸变小、动态范围大等特点。对ＭＣＰ皮秒选通的数值模拟考虑了电子渡越时间及弥散影响。变象管研制着重解决了微通道板上微带线的欧姆损耗问题。The technology of gating MCP in image intensifier with picosecond high voltage pulse forultrahigh speed photography has been developed in our group since 1 9 8 7.The voltage pulse wasgenerated by using GaAs photoswitch at that time. Great progress has been made since last year,which is reported in this paper,Our new camera consists of a special proximity focused MCP imagerand a high voltage pulse generator. The picosecond high voltage pulse is generated by a sharpeningdiode circuit that is driven by a high voltage step pulse,A meander shape infinity-ground microstripline was formed by speccial method on the input surface of the MCP and the rear face of the MCP that is coated with conducting metal layer,such configuration was used to reduce the ohmic loss ofmicrostrip line on the MCP.The MCP is 2 6 mm in diameter and 0 5 mm in thickness,The channeldiameter is 1 2.5μm. The fiber-optic face plate is coated with P 2 0 phosphor screen.The imageis recorded in a film contacting the face plate. The gain characteristics of the MCP gated bypicosecond pulse were simulated taking into account the effect of the electron transit timedispersion,The static spatial resolution of the camera is 2 0 1 p mm when the phosphor screenis applied with 3 kV voltage and the measured temporal resolution is～10 0 ps,By using themeander microstrip line configuration,up to 1 2 frame images were gated by a single voltagepulse.The camera has been used for diagnosis of plasma produced by 1 kJ laser beams andworked well.;Microchannel plcqte(MCP)Prof.

关 键 词：超高速摄影 摄影机 

分 类 号：TB853.17[一般工业技术—摄影技术]