Interaction of a Spiral Electron Beam and a Resonant Microwave Cavity
作者:
F. K. Willenbrock,
S. P. Cooke,
期刊:
Journal of Applied Physics
(AIP Available online 1950)
卷期:
Volume 21,
issue 2
页码: 114-125
ISSN:0021-8979
年代: 1950
DOI:10.1063/1.1699610
出版商: AIP
数据来源: AIP
摘要:
The interaction between the electromagnetic field in a cavity and an electron beam projected along the axis of the cavity is examined. The particular cavity considered here is of the cylindrical TE11nztype in a steady axial magnetic field. If the cavity is excited in a linearly polarized mode, the electromagnetic field will drive the electrons in a helical trajectory with an expanding radius, and the electrons will excite and transfer energy to a degenerate mode oriented spatially at right angles to the driving field. In the driving plane of polarization (both planes of polarization if the cavity is excited in a circularly polarized mode), the electron beam will excite a field in phase opposition to the driving field in a manner analogous to the counter e.m.f. in an electromechanical generator. The converse case of a TE11nzcavity excited by a spiral beam of electrons is also considered.
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