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Masatoh Takahashi,Kazuo Ogura,Hiroyuki Yoshimura,Hiroshi Iiduka,Akira Sugawara,Kiyoyuki Yambe,김원섭 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
Experimental studies of coaxial oversized backward wave oscillators (BWOs) are presented. The beam voltage is weakly relativistic less than 100 kV. The slow-wave structure (SWS) consists of a rectangularly corrugated oversized hollow waveguide and rectangularly corrugated inner conductor, whose target operating frequency due to Cherenkov interaction is in the K-band. The coaxial SWS can have two surface waves caused by the inner and outer corrugations. The oversized BWO operations under the influences of two surface waves are examined. An oscillation starting voltage decreases by introducing the rectangularly corrugated inner conductor. Output powers increase greatly as compared with those without the corrugated inner conductor. The inner corrugation improves the oversized BWO operation