@inproceedings{oai:niigata-u.repo.nii.ac.jp:00031090,
 author = {Ogura, Kazuo and Yoshida, Ryo and Yamashita, Yuichiro and Yamazaki, Hoshiyuki and Komiyama, Kiyofumi and Sakai, Masakazu},
 book = {Progress in plasma theory and understanding of fusion plasmas : Proceedings of 13th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion (ITC-13), December 9-12, 2003, Toki-city, Japan, Progress in plasma theory and understanding of fusion plasmas : Proceedings of 13th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion (ITC-13), December 9-12, 2003, Toki-city, Japan},
 month = {Dec},
 note = {Oscillation starting condition of a K-band oversized backward wave oscillator (BWO) is investigated experimentally. Periodically corrugated slow-wave　structure (SWS) is used, which is designed for K-band operation in a weakly relativistic region, i.e. 30-80 kV. The beam current is in the range of 50-　00 A. It is shown experimentally that there exists a critical beam energy (starting energy) for the meaningful radiation. The starting energy is more　critical than the starting current in the oversized BWO. It decreases by increasing the SWS length. Above the starting energy, the output owers up to about 100 kW are obtained. The typical frequency observed is about 23 GHz. Nonaxisymmetric hybrid HE11 mode as well as axisymmetric TM01 mode is observed. The operation mode is able to be controlled by the SWS length and the magnetic field strength.},
 pages = {703--706},
 publisher = {The Japan Society of Plasma Science and Nuclear Fusion Research},
 title = {Study on Oscillation Starting Condition of K-Band Oversized Backward Wave Oscillator Driven by a Weakly Relativistic Electron Beam},
 year = {2004}
}