一、前言 能量为2兆电子伏特、束流强度为200微安的JJ-2型电子静电加速器是我所元老产品,其诞生于六十年代初期,曾荣获国家新产品奖,在六十年代后期已远销国外,深受国内外用户的欢迎。目前国内用户已遍及全国各地。此加速器可供高等院校和科研单位做实验用,但更多的却是用于辐 I. INTRODUCTION The JJ-2 electron electrostatic accelerator with an energy of 2 mega-volts and a beam current of 200 micro-amperes is a veteran product of my own. It was born in the early 1960s and won the National New Product Award. In the 1960s Late have been exported to foreign countries, welcomed by users at home and abroad. At present, domestic users have spread all over the country. This accelerator can be used by colleges and universities and scientific research units, but more is used for the spokes