A High Current Ion Source

Abstract
An ion source is described which utilizes a hot cathode as an electron source and an axial magnetic field for focusing. The electron beam is pulsed for 250 μsec. 60 times a second. Peak ion currents of 100 ma are readily obtainable. At a hydrogen pressure of 25 microns of Hg the proton content of the beam is between 30 and 40 percent. Constructional details and operating conditions are given.
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