@article{oai:repo.qst.go.jp:00048759,
 author = {池田, 亮介 and 小田, 靖久 and 小林, 貴之 and 寺門, 正之 and 梶原, 健 and 高橋, 幸司 and 森山, 伸一 and 坂本, 慶司 and 池田 亮介 and 小田 靖久 and 小林 貴之 and 寺門 正之 and 梶原 健 and 高橋 幸司 and 森山 伸一 and 坂本 慶司},
 journal = {Fusion Engineering and Design},
 month = {Jan},
 note = {A TE31,11 mode gyrotron has being developed to improve the output power for the ITER electron cyclotron (EC) system. Strong mode competition having counter-rotating modes in both the high and/or low field sides is, in general, the typical issue for high order mode oscillations. Active anode voltage control and beam radius control were introduced to overcome this issue and obtain stable 1MW oscillation. The TE31,11 mode was oscillated in a hard-self excitation region and the efficiency was improved up to 50%. Long pulse operation of output power of 1MW with total efficiency of 46% for 230 s was also performed. Oscillations of over–1MW power of 1.1MW and 1.2MW for 2 s pulse were achieved.},
 pages = {23--27},
 title = {Development of 170 GHz, 1MW gyrotron with high-order TE31,11 mode oscillation for ITER EC system},
 volume = {128},
 year = {2018}
}