%0 Journal Article
%T ELECTRON BEAM FOCUSING WITH PERIODIC MAGNET STRUCTURES<br>永久磁铁周期性聚焦电子束
%A HO KUO-CHU
%A <br>何国柱
%J 物理学报
%D 1959
%I 
%X The paraxial-ray equation for describing the electron trajectories in a periodic magnetic field has been solved by a perturbation method. Space charge effect is included. The cathode may bs partially shielded. By this method, it is possible to obtain high
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=C0750A2A704CDA48&yid=AC45B356D9DF3BDB&vid=23CCDDCD68FFCC2F&iid=F3090AE9B60B7ED1&sid=A726E84831FE609B&eid=811ACA5D3673A764&journal_id=1000-3290&journal_name=物理学报&referenced_num=2&reference_num=0