公开(公告)号：US3593058A

公开(公告)日：1971-07-13

申请号：US3593058D

申请日：1970-03-17

Applicant: HAROLD A HOGG

Inventor： HOGG HAROLD A

IPC: H01J3/02 ,  H01J25/76 ,  H05H7/08 ,  H01J7/46 ,  H01J19/80

CPC classification number: H05H7/08 ,  H01J3/023 ,  H01J25/76

Abstract: An electron injector wherein a stream of electrons is emitted from a gridded thermionic emitter into a region between two electrodes. An electric field alternating at a microwave frequency is applied between the electrodes, and the electron stream leaves the thermionic emitter parallel to this field. A steady magnetic field is applied across the region in a direction that is transverse to the electric field. The combined effects of the microwave electric field and the steady magnetic field on the electron stream are such that the stream becomes focused into a bunch that follows a quasi-cycloidal orbit in which the electrons strike a secondary emitter from which an amplified bunch of electrons is emitted to follow a similar orbit, to be further focused into a bunch and to strike another secondary emitter. This process is repeated until the desired intensity is achieved whereupon the final bunch of electrons is injected into an electron accelerator during the final orbit.