公开(公告)号：US5200670A

公开(公告)日：1993-04-06

申请号：US592048

申请日：1990-10-04

Applicant: Simon J. Scott

Inventor： Simon J. Scott

IPC: H05H1/22 ,  H01J3/02 ,  H01J33/02 ,  H01J35/22 ,  H01S3/038 ,  H01S3/0971 ,  H05H7/08

CPC classification number: H01J3/025 ,  H01S3/038 ,  H01S3/09716

Abstract: A surface discharge plasma cathode electron beam generating assembly (1) includes an anode (2) maintainable at a substantially constant first potential, a cathode device (3) having a first electrically conductive member (4), a dielectric member (5) at least partially surrounding the first member (4) and electrically conductive means (6) located on the outer surface of the dielectric member (5) and insulated therefrom. A capacitative divider circuit (7) is provided for maintaining the first electrically conductive member (4) at a second potential different from the first potential and for maintaining the electrically conductive means (6) at a high negative third potential relative to the first and second potentials.