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(FTP1/20) Development of 100 GHz Band High Power Gyrotron for Fusion Experimental Reactor

K. Sakamoto¹⁾, A. Kasugai¹⁾, H. Shoyama¹⁾, K. Hayashi¹⁾, K. Takahashi¹⁾, M. Tsuneoka¹⁾, Y. Ikeda¹⁾, K. Kajiwara¹⁾, S. Moriyama¹⁾, M. Seki¹⁾, T. Fujii¹⁾, T. Kariya²⁾, Y. Mitsunaka²⁾, T. Imai^1)
 
1) JAERI, Naka, Ibaraki, Japan
²⁾ Toshiba Co., Otawara, Tochigi, Japan

Abstract.  In JAERI, 1MW gyrotrons of 170GHz and 110GHz are under development for ITER (International Thermonuclear Experimental Reactor) and JT-60U, respectively. Both gyrotrons have a depressed collector for an efficiency improvement and a low loss synthetic diamond window that enables Gaussian beam output over 1MW. Three 110GHz gyrotrons are used on an electron cyclotron heating and current drive(ECH/ECCD) system on JT-60U, in which the output power of $\sim$0.8MW/3sec was generated from each gyrotron. As for 170GHz, output power of 1.2MW with electron beam of 85kV/49A was obtained on a short pulse gyrotron. The efficiency of $\sim$57% was attained at 1.1MW with the depressed collector. Based on these results, the 1MW 170GHz gyrotron for long pulse operation was fabricated.

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