Real-time control of the deposition location of ECRH in the LHD
Real-time control of the deposition location of ECRH in the LHD
复制标题
实时控制 LHD 中 ECRH 的沉积位置
DOI：
10.1016/j.fusengdes.2020.111480
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发表时间：
2020
影响因子：
1.7
通讯作者：
Ohshima S.
中科院分区：
文献类型：
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作者：
Ii Tsujimura T.;Mizuno Y.;Yanai R.;Tokuzawa T.;Ito Y.;Nishiura M.;Kubo S.;Shimozuma T.;Yoshimura Y.;Igami H.;Takahashi H.;Tanaka K.;Yoshinuma M.;Ohshima S.
研制了一种电子回旋共振加热（ECRH）沉积位置实时控制系统，并将其应用于大型螺旋装置（LHD）实验。适当的设置为ECRH可控发射器获得通过评估沉积位置和吸收功率的各种电子密度分布，使用射线跟踪代码。实时沉积位置控制系统基于射线跟踪计算调整发射器设置以改善折射电子回旋波的第一次通过吸收。控制系统采用快速现场可编程门阵列（FPGA）。FPGA真实的实时处理关于密度分布的特征参数的计算和发射器的转向镜的旋转控制所要求的目标位置的计算。实时沉积位置控制在ECRH放电过程中的LHD上成功地维持吸收功率高于没有控制，这是由于沉积位置维持在等离子体核心区域。
A real-time control system for the deposition location of electron cyclotron resonance heating (ECRH) has been newly developed and applied to experiments on the Large Helical Device (LHD). Appropriate settings for a steerable launcher for ECRH were obtained by evaluating the deposition location and the absorption power for various electron density profiles using a ray-tracing code. The real-time deposition location control system adjusts launcher settings to improve the first-pass absorption of the refracted electron cyclotron wave, based on the ray-tracing calculations. The control system was designed to use a fast field programmable gate array (FPGA). The FPGA processes in real time the calculation of characteristic parameters regarding the density profile and the calculation of target positions requested for rotation control of a steering mirror of the launcher. The real-time deposition location control during ECRH discharges on the LHD functioned successfully in maintaining the absorption power higher than that without the control, which resulted from the deposition location maintained in the plasma core region.