X射线皮秒变象管分幅相机研究

本文介绍了我们提出的一种新的实现皮秒分幅摄影的技术方案,其优点是对控制线路要求不高,给出了用计算机对此方案进行数值模拟的结果和新设计的用于这种分幅方案的变象管特性,用直流X射线源测出该变象管的静态空间分辨率为20lp/mm。用激光打靶产生的脉冲X射线测量了相机动态特性,已得到了四幅动态像,每幅曝光时间150ps,空间分辨率3lp/mm。

PKIMIRY INVESHGATION OF X-RAY PICOSFCOND FRAMINO CAMERA

A new method of x-ray picosecond framing photography has been proposed for the studies of laser prodnond plasma fhis method uses a image tube in which there are shutter plareseparating double-slits aperture and compensate plate.Two discrete images of the plasnre are med on the photocathode of the tube by doublepin-holes.Two resutted are deflected by the shutter pkte at the back of the cross over point, two pairsof compensate plates are used to separate the images and eliminate image smear on the phosphor screen. Four frame images can be got by this method.We have designed a new image convert tube for the method. The tube is 300mm in length and 88mm in diameter The effective area of the photocathode and the screen are 20mm and 40mm in diameter respectively:The magnification of the tube is Ⅺ,5. Computer simulation showed that for 5 ×5mm format image (on photocathode)and 100 picosecond exposure time for each frame image, 101p/mm dynamic spatial resolution can be obtained.The rate of the ramp voltage applied on the shutter plate and compensate plate shoud be 4.1 kv/ns which is not difficult to produce.The image convert tube has been manufactured in the demountable type,CsI was used as the photocathode with Formvar substrate,making the camera sensitive to soft x-ray and the cathode area large enough, The electron images were intensified by the MCP in front of the screen.static resolution of 201p/mm was measured with a d.c.x-ray source Four frame quasi-static images on the screen with repetitive exposure sho-wed the reality of the new framing concept. Some preliminary dynamic experiment results have been obtained using laser producd X-ray and a Krytron tube ramp high voltage generator.