A novel Lagrangian simulation technique for helix traveling-wave tubes
✍ Scribed by S. K. Datta; S. U. M. Reddy; B. N. Basu; K. U. Limaye
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 87 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
A no¨el one-dimensional Lagrangian simulation of beam᎐wa¨e interaction in helix tra¨eling-wa¨e tubes is introduced in this paper. Unlike the traditional transmission-line coupled-mode Lagrangian analysis, direct electromagnetic coupling of the electric field to the RF signal from the Fourier harmonic components of RF current in a modulated beam is discussed here in terms of the interaction impedance of the RF structure by considering the modulated stream of mo¨ing charges as a radiating source. The model presented is ¨ery simple and fast, as all of the expressions and equations de¨eloped are in closed form and the simulation in¨ol¨es only one numerical integration at each step. The results obtained using the present model show good agreement ( ) de¨iation -2% with that generated using the traditional one-dimensional transmission-line coupled-mode Lagrangian analysis of Rowe. The theory presented is general, and can be used directly for the analysis of harmonic generation as well as multisignal operation in helix tra¨eling-wa¨e tubes.