@inproceedings{oai:niigata-u.repo.nii.ac.jp:00031093, author = {Ogura, Kazuo and Miyazawa, Yushi and Tanaka, Hidekazu and Kiuchi, Yutaka and Aoyama, Satoshi and Sugawara, Akira}, book = {Sixteenth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion, Sixteenth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion}, month = {Feb}, note = {We report an oversized K-band backward wave oscillator (BWO) operating above 20 GHz in the weakly relativistic region less than 100 kV. It is very important to prevent microwave from going into the beam diode, since intense microwaves will harmfully affect beam generation. A weakly relativistic oversized BWO is demonstrated using a Bragg reflector at the input end of slow wave structure (SWS). The effect of the Bragg reflector on the BWO operation is examined, by changing the boundary condition at the SWS input end. The Bragg reflector improves the performance of the oversized BWO.}, pages = {S1041-1--S1041-4}, publisher = {Japan Society of Plasma Science and Nuclear Fusion Research}, title = {Weakly Relativistic K-band Oversized Backward Wave Oscillator with Bragg Reflector at Input End of Slow Wave Structure}, volume = {2}, year = {2007} }