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公开(公告)号：US3602763A
公开(公告)日：1971-08-31
申请号：US3602763D
申请日：1969-10-28
Applicant: ATOMIC ENERGY COMMISSION
Inventor： HALL ROBERT R
CPC classification number: H01J27/10
Abstract: A central spike cathode is added to and is axially positioned through the conventional spiral filament-type cathode of a duoplasmatron-type ion source such that the current output and cathode lifetime thereof are substantially increased. The added spike cathode is so positioned that it is the closest item to the intermediate electrode of the ion source. Further increase in operating performance can be obtained when a cylindrical shield is utilized to surround the cathode assembly. The spiral filament may be turned off after initiating the arc of the ion source.
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