Kogi Yuichiro, Sakoda Takuya, Mase Atsushi, Ito Naoki, Yokota Yuya, Yamaguchi Soichiro, Nagayama Yoshio, Jeong Seung H, Kwon Myeun, Kawahata Kazuo
Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga Fukuoka 816-8580, Japan.
Rev Sci Instrum. 2008 Oct;79(10):10F115. doi: 10.1063/1.2966380.
Plasma experiments on KSTAR are scheduled to start up this year (2008). We have developed an electron cyclotron emission (ECE) radiometer to measure the radial electron temperature profiles in KSTAR experiments. The radiometer system consists, briefly, of two downconversion stages, amplifiers, bandpass filter banks, and video detectors. These components are made commercially or developed in house. The system detects ECE power in the frequency range from 110 to 196 GHz, the detected signal being resolved by means of 48 frequency windows. Before installation of this system on KSTAR, we installed a part of this system on large helical device (LHD) to study the system under similar plasma conditions. In this experiment, the signal amplitude, considered to be proportional to the electron temperature, is measured. The time-dependent traces of the electron temperature measured by this radiometer are in good agreement with those provided by the LHD Michelson spectrometer. The system noise level which limits the minimum measurable temperature (converted to the electron temperature) is about 30 eV.
韩国超导托卡马克先进研究装置（KSTAR）的等离子体实验计划于今年（2008年）启动。我们已经研制出一种电子回旋辐射（ECE）辐射计，用于测量KSTAR实验中的径向电子温度分布。该辐射计系统简要地由两个下变频阶段、放大器、带通滤波器组和视频探测器组成。这些部件有的是商业采购的，有的是自主研发的。该系统检测频率范围为110至196吉赫兹的ECE功率，检测到的信号通过48个频率窗口进行分辨。在将该系统安装到KSTAR之前，我们先将该系统的一部分安装在大型螺旋装置（LHD）上，以便在类似的等离子体条件下研究该系统。在这个实验中，测量了被认为与电子温度成正比的信号幅度。用该辐射计测量的电子温度随时间变化的曲线与LHD迈克尔逊光谱仪提供的曲线吻合良好。限制最低可测温度（换算为电子温度）的系统噪声水平约为30电子伏特。
