公开(公告)号：US3566184A

公开(公告)日：1971-02-23

申请号：US3566184D

申请日：1968-07-17

Applicant: ATOMIC ENERGY AUTHORITY UK

Inventor： MASKELL CLIFFORD WILLIAM ALFRE

IPC: H01J3/02 ,  H01J17/06 ,  H01J37/04 ,  H01J37/30

CPC classification number: H01J3/025 ,  H01J17/066 ,  H01J2893/0066

Abstract: A cold cathode discharge device comprising an enclosure, having means to admit a gas to the interior of said enclosure and means to maintain the gas therein at a predetermined pressure. An anode is at least partly disposed within the enclosure and a hollow cathode of mesh material is mounted within the enclosure. One wall of the cathode has an aperture in which is positioned a further electrode which, with the aperture, defines a gap. A suitable operating potential is applied to the anode, cathode, and further electrode whereby a stream of electrons leave the hollow cathode through the gap to produce a beam having a crosssectional shape substantially the same as the shape of the gap. The beam is focused by varying the potential applied to the further electrode.

公开(公告)号：US3518484A

公开(公告)日：1970-06-30

申请号：US3518484D

申请日：1966-12-28

Applicant: ATOMIC ENERGY AUTHORITY UK

Inventor： MASKELL CLIFFORD WILLIAM ALFRE

IPC: H01J17/06 ,  H01J17/44 ,  H01J37/077 ,  H01J7/24 ,  H01J17/26

CPC classification number: H01J3/025 ,  H01J17/066 ,  H01J17/44 ,  H01J37/077 ,  H01J2893/0066 ,  H01J2893/0068