Title :
Electromagnetic properties of open and closed overmoded slow-wave resonators for interaction with relativistic electron beams
Author :
Main, W. ; Carmel, Y. ; Ogura, K. ; Weaver, J. ; Nusinovich, G.S. ; Kobayashi, S. ; Tate, J.P. ; Rodgers, J. ; Bromborsky, A. ; Watanabe, S. ; Amin, M.R. ; Minami, K. ; Destler, W.W. ; Granatstein, V.L.
Author_Institution :
ACCURAY Inc., Santa Clara, CA, USA
fDate :
10/1/1994 12:00:00 AM
Abstract :
Specific slow wave structures are needed in order to produce coherent Cherenkov radiation in overmoded relativistic generators. The electromagnetic characteristics of such slow wave, resonant, finite length structures commonly used in relativistic backward wave oscillators have been studied both experimentally and theoretically. In experiments, perturbation techniques were used to study both the fundamental and higher order symmetric transverse magnetic (TM) modes. Finite length effects lead to end reflections and quantization of the wave number. The effects of end reflections in open slow wave structures were found from the spectral broadening of the discrete resonances of the different axial modes. The measured axial and radial field distributions are in excellent agreement with the results of a 2-D code developed for the calculation of the fields in these structures
Keywords :
Cherenkov radiation; backward wave oscillators; cavity resonators; microwave generation; relativistic electron beam tubes; slow wave structures; axial modes; backward wave oscillators; coherent Cherenkov radiation; discrete resonances; electromagnetic properties; end reflections; field distributions; finite length structures; overmoded relativistic generators; overmoded slow-wave resonators; perturbation techniques; relativistic electron beams; spectral broadening; symmetric transverse magnetic modes; wave number quantization; Electromagnetic reflection; Electromagnetic scattering; Electron beams; Magnetic resonance; Microwave devices; Microwave generation; Optical reflection; Periodic structures; Perturbation methods; Q factor;
Journal_Title :
Plasma Science, IEEE Transactions on