Heavily-loaded wideband helix traveling wave tube

Author

Joo, Young-do ; Jung, Sun-Shin ; Kim, Jung-II ; Han, Seung-Tae ; Baik, Chan-Wook ; Jeon, Seok-Gy ; Jia, Baoh ; Kim, Hyoung-Suk ; Uhm, Han S. ; Park, Gun-Sik

Author_Institution

Sch. of Phys., Seoul Nat. Univ., South Korea

fYear

2002

fDate

2002

Firstpage

48

Lastpage

49

Abstract

The experimental work for a wideband (6-18GHz) helix TWT with a heavy ceramic loading has been carried out at SNU. The well known issues of this kind of TWT are the maximum allowed 2^nd harmonic level at the lower frequency range and minimum allowed efficiency at the higher frequency range. The "negative" dispersion of a helical slow-wave structure (SWS) is a key concept to ensure a successful operation in wideband helix TWT. In this study, an unconventional "positive phase-velocity-tapering" with an unequal ceramic rod was employed to enhance the second harmonic level at the lower frequencies and efficiency at the higher frequencies. The dispersion and the interaction impedance of the structure were predicted by a 3-D HFSS code.

Keywords

digital simulation; helical waveguides; slow wave structures; travelling wave tubes; 3D HFSS code; 6 to 18 GHz; SNU; heavily-loaded wideband helix traveling wave tube; heavy ceramic loading; interaction impedance; minimum allowed efficiency; positive phase-velocity-tapering; second harmonic level; slow-wave structure; unequal ceramic rod; Blades; Ceramics; Copper; Degradation; Frequency; Impedance measurement; Physics; Power measurement; Prototypes; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International

Print_ISBN

0-7803-7256-5

Type

conf

DOI

10.1109/IVELEC.2002.999254

Filename

999254