公开(公告)号：US4082979A

公开(公告)日：1978-04-04

申请号：US727722

申请日：1976-09-29

申请人： George K. Farney ,  Fred A. Feulner

发明人： George K. Farney ,  Fred A. Feulner

IPC分类号： H01J23/24 ,  H01J23/40 ,  H01J25/42 ,  H01J25/44 ,  H01J25/50 ,  H01J25/34

CPC分类号： H01J25/44

摘要： Noise in reentrant-stream crossed-field amplifiers is suspected of being generated by electrons re-entering the interaction region with large amplitude cycloidal motion near the slow-wave circuit. Means to increase the electric field in a portion of the drift region preceding the circuit lowers the noise, presumably by collecting these electrons. The field may be increased by decreasing the spacing between cathode and drift electrode or by applying a bias voltage on an insulated electrode.