Abstract
A new type of high-speed ion pump using a multipactor cathode is proposed and the results, obtained in our experiments of the pump which was manufactured by way of the first trial, are described. The multipactor cathode has excellent characteristics for such a use, as follows; 1) it does not contaminate vacuum condition, because it is a cold cathode made of some pure metal, as like as Al. 2) electron emission density is considerably high. 3) ionization rate of supplied electrons can be increased largely compared with any other electron supply method. 4) supply of electrons into a considerably wide area is quite easy.
We could confirm an advantageous characteristic of the pump, that is, the maximum pump current per unit volume reached up to 30 times as much as that of a usual ion pump in vacuum conditions of less than 10 -4 Pa.
