Initial results of electron cyclotron range of frequency (ECRF) operation and experiments in JT-60U
Initial results of electron cyclotron range of frequency (ECRF) operation and experiments in JT-60U
复制标题
JT-60U 电子回旋加速器频率范围 (ECRF) 运行和实验的初步结果
DOI：
10.1016/s0920-3796(00)00511-1
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发表时间：
2001
影响因子：
1.7
通讯作者：
T. Fujii
中科院分区：
文献类型：
--
作者：
Y. Ikeda;A. Kasugai;K. Takahashi;K. Kajiwara;A. Isayama;S. Ide;M. Terakado;S. Shinozaki;K. Yokokura;K. Anno;M. Shimono;S. Hiranai;K. Haga;A. Kajiyama;Y. Ikeda;S. Moriyama;M. Tsuneoka;K. Sakamoto;K. Hamamatsu;T. Oikawa;Y. Kamada;O. Naito;M. Seki;K. Ushigusa;T. Imai;Takumi Yamamoto;T. Fujii
在JT-60 U上设计和建造了110 GHz 1 MW电子回旋频率范围（ECRF）系统，用于局部加热和控制等离子体。回旋管有一个菱形窗口，用于传输高斯模式的射频功率，对于波纹波导的传输线，高斯模式很容易转换为HE 11模式。第二个金刚石窗口安装在天线的入口处，用于传输线和JT-60 U托卡马克之间的真空密封。从回旋管到天线的传输线的总长度约为60 m，包括9米弯曲。天线具有聚焦镜和平坦的可转向镜，以聚焦和控制主要在极向方向上的RF波束角。在初始运行中，当回旋管产生高达1 MW的功率时，PEC的功率为0.75MW，持续2s成功地注入等离子体。从回旋管到等离子体的总传输效率约为75%。的可控性的局部电子加热与=15厘米的沉积宽度被很好地证明了通过使用可操纵的反射镜。在高Teplasma下观察到沉积位置的大的下移。强中心电子加热，从2.2到6.6 keV的PEC 0.75 MW，0.3 s在优化的极化。在NBI产生的高β pH模式等离子体中，当注入电子能量达到10 keV，持续时间为1.6s时，也获得了有效的电子加热。
The 110 GHz 1 MW electron cyclotron range of frequency (ECRF) system was designed and constructed on JT-60U to locally heat and control the plasmas. The gyrotron has a diamond window to transmit RF power with Gaussian mode, which is easily transformed to HE11mode for the transmission line of the corrugated waveguide. The second diamond window is installed at the inlet of the antenna for a vacuum seal between the transmission line and the JT-60U tokamak. The total length of the transmission line from the gyrotron to the antenna is about 60 m including nine meter bends, The antenna has a focusing mirror and a flat steerable one to focus and to control the RF beam angle mainly in the poloidal direction. In the initial operation, the power of PEC∼0.75 MW for 2 s was successfully injected into plasma when the gyrotron generated the power up to 1 MW. The total transmission efficiency from the gyrotron to the plasma was about 75%. A controllability of local electron heating with the deposition width of =15 cm was well demonstrated by using the steerable mirror. A large downshift in the deposition position was observed at the high Teplasma. Strong central electron heating was obtained from 2.2 to 6.6 keV for PEC∼0.75 MW, 0.3 s at the optimized polarization. An effective electron heating was also obtained up to ∼10 keV during EC injection for ∼1.6 s in the high βpH-mode plasma produced by NBI.