公开(公告)号：US3614510A

公开(公告)日：1971-10-19

申请号：US3614510D

申请日：1969-06-02

Applicant: UNITED EKINGDOM ATOMIC ENERGY

Inventor： MASKELL CLIFFORD WILLIAM ALFRE

IPC: H01J17/38 ,  H01J37/06 ,  H01J37/077 ,  H01J37/08 ,  H01J17/04 ,  H01J17/26

CPC classification number: H01J37/061 ,  H01J37/077 ,  H01J37/08

Abstract: A nonthermionic cathode glow discharge device comprising an enclosure and means to maintain gas in the enclosure at a predetermined pressure. An anode is mounted in the enclosure or forms a part of a wall of the enclosure. A cathode having a surface directed at a treatment zone is suspended in the enclosure and has an aperture therein in which is positioned a control electrode. The said surface of the cathode may extend longitudinally or may be shaped as a segment of a sphere. By varying the potential applied to the control electrode with respect to the cathode, the focal point of the electron or ion beam and the current of the output beam can be controlled. A third electrode may be provided to surround part of the cathode to act as a screen to minimize unwanted electron emission from the cathode.