emission surface meaning in English

阴极面

( 4 ) chapter vi . the theory of ion curren extraction of rf ion source is investigated , the reason of emission surface formation and its effect on ion curren extraction are reasearched emphatically
( 4 )对高频离子源的束流引出原理作了理论推导和分析，着重研究了发射面的形成及其对引出束流特性的影响。
Finally , the characteristics of ion curren extraction in different conditions are simulationed with magic software , and the parameter of best emission surface is obtained
最后，采用magic程序对高频离子源不同引出参数下的束流引出特性进行了数值模拟，得到了获得最佳的引出离子束所要求的等离子体发射面参数。