四通道X射线MCP行波选通分幅相机  

MCP GATED PICOSECOND X-RAY FRAMING CAMERA

作　　者：山冰[1] 常增虎[1] 刘进元[1] 刘秀琴[1] 高胜琛[1] 任有来[1] 朱文华 骆永明[1] 侯洵[1] 成金秀 杨存榜 温天舒 唐道源 温树槐 

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,西安710068 [2]西南核物理与化学研究所

出　　处：《光子学报》1997年第5期449-456,共8页Acta Photonica Sinica

摘　　要：简述了MCP行波选通分幅相机的工作原理及技术指标，报道了最新研制的四通道行波选通分幅相机的研制结果及使用情况，相机可接连拍摄12幅图象，每幅象的曝光时间为60至100ps、空间分辨率15lp／mm时调制度10％，观测时间在几百皮秒至几纳秒内可调．在星光装置上的使用表明相机的实用性强、抗干扰能力高，并在国内首次较全面地测量了各种靶型的时间分辨分幅结果．The working principle of gated MCP framing camera is reviewed. And a new gated MCP framing camera system is reported. Some technical consideration of system design of the framing camera system is discussed.The new camera system consists of a proximity focused MCP imager with four parallel stripline cathodes,a control unit,and a mechanical system for pinholes mounting and adjustment. The MCP of the imaget is 56mm in diameter and 0. 5mm in thickness, and the channel diameter is 12 μm. The fiber-optic face plate is coated with P20 phosphor screen. The pinholes system with its two orthogonal arranged stepping motors can adjust the pinholes precisely to the correct position. The control unit provides all the power supply of the camera system including voltage to phosphor screen, gating pulses to MCP, bias and static checking voltage of MCP,control signals for stepping mot0rs,and power for UV light and illuminating light for pinholes. The four gating pulses of the striplines are generated by two sharpening diode circuit driven by one high voltage step pulse which is formed by avalanche transistor circuit. The time interval between striplines can be adjusted easily by varying the length of the coaxial connected sharpening circuit to imager. The pinholes can be driven either by manual or computer controls. The images is recorded with a film contacting the face plate of a TE/CCD system.With the screen voltage supplied by eontrbl unit set to 2.6kV, 3.5kV, the camera system canwork at low vacuum to 5×10-5× 133. 3224Pa with 2. 6kV or at higher vacuum to get a better spatial resolution and gain with 4. 5kV. The static spatial resolution of the camera is measured to be 151p/mm with 10% modulation. And measured exposure time of the camera ranges from 60 ps to 100 ps with different MCP bias set with 90V to - 90V. The camera had been used at the 11# high power laser system and several important results of different target type were taken by the camera successfully.

关 键 词：超高速摄影 皮秒 变象管 微通道板 分幅相机 

分 类 号：TB853.17[一般工业技术—摄影技术]