The Beam-Wave Interaction in a Ka-Band Relativistic Coupled-Cavity TWT
Source: International Journal of Infrared and Millimeter Waves, Volume 23, Number 9, September 2002 , pp. 1371-1383(13)
Abstract:By the method of the eigen mode expansion, a full three-dimensional (3-D) model has been developed that can be used to investigate the beam-wave interaction in a high-power, Ka-band relativistic coupled-cavity traveling-wave tube (TWT). In the tube studied by us, a sever in the interaction section is used to restrain the oscillation of RF electromagnetic fields between the input and output end. In this case, the asymmetric hybrid HTM11 mode has little impact on the main interaction process [1,2], so the RF electromagnetic fields mainly interacting with the modulated electron beam belong to the symmetric mode TM01. The presented model includes three-dimensional RF fields, three-dimensional electron motions, and improved three-dimensional space-charge fields including dc and ac space-charge fields. Moreover, this model can also calculate backward radiation excited by modulated electron beam and the direct effect of the transverse electron motion on the energy exchange. Our calculation results show that the space-charge field has evident effect on the interaction process, the transverse electron motion has some, and the backward radiation has little.
Document Type: Research Article
Affiliations: 1: Institute of High Energy Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China. E-mail: firstname.lastname@example.org 2: Institute of High Energy Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China
Publication date: September 2002