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Takayuki Iwasaki,Kazuo Ogura,Shota Magori,Junpei Kojima,Kiyoyuki Yambe 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
Smith-Purcell (SP) radiations of weakly relativistic oversized backward wave oscillator (BWO)are examined experimentally. A bunching section composed of a coaxial slow wave structure withinner K-band corrugation is placed upstream from the oversized BWO. An annular beam lessthan 100 kV is self-bunched in the bunching section and then excites the oversized BWO. SPradiations are examined by using 25.5- and 45.0-GHz oversized BWOs. The beam is too far awayfrom the walls of the oversized BWO for SP radiation to occur without the self-bunching. Whenthe corrugation parameters of the bunching section are the same as those of the oversized BWO,enhanced SP radiations in the frequency region above the surface wave are observed even when thebeam propagates outside the interaction region of the surface wave.