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A time-dependent theory for helix traveling wave tubes in beam-wave interaction

Peng Wei-Feng Hu Yu-Lu Yang Zhong-Hai Li Jian-Qing Lu Qi-Ru Li Bin

A time-dependent theory for helix traveling wave tubes in beam-wave interaction

Peng Wei-Feng, Hu Yu-Lu, Yang Zhong-Hai, Li Jian-Qing, Lu Qi-Ru, Li Bin
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Publishing process
  • Received Date:  12 January 2010
  • Accepted Date:  06 July 2010
  • Published Online:  05 June 2010

A time-dependent theory for helix traveling wave tubes in beam-wave interaction

  • 1. Key Laboratory of National Defense of Science and Technology for High Power Microwave Electronics Vacuum Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

Abstract: A time-dependent theory for helix traveling wave tubes in beam-wave interaction is presented. The effect of wave on electrons is described by radio frequency (RF) field equations and space charge (SC) field equations, while the effect of electrons on waves is described by electron dynamic equations. The RF field equations are achieved from Ampere’s law and Faraday law, combined with sheath helix model RF field. The SC field equations are achieved from a space charge wave model. The electron dynamic equations are achieved by substituting the RF field equations and the SC field equations into the Lorenz force equation. Using coupling impedance to treat exciting sources of RF field equations, the RF and the SC field equations can be solved with the help of high frequency simulation software, such as HFSS or HFCS, which makes this time-dependent theory more flexible. The feasibility of this theory is proved by numerical simulation.

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