Microwave testing of a CVD diamond torus window prototype for iter

T. Scherer, R. Heidinger, A. Meier, K. Takahashi, K. Kajiwara, K. Sakamoto
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引用次数: 1

Abstract

For the plasma engineering of ITER, EC launchers will be used at the mid and top port levels. The EU is preparing the procurement of the upper port plug and JA the procurement of the equatorial. Part of these studies is to verify the window design and to work out, whether a concept is available for both launchers. To this goal, first experiments with low and high power mm-waves are performed and will be presented. The high power RE behavior of torus window assemblies with corrugated waveguides is being investigated by using IR imaging technique during high power microwave loading up to 1 MW at a frequency of 170 GHz at the JAEA gyrotron facility. Short and long pulse experiments are being performed to determine the temperature distribution over the whole diamond window area and the efficiency of the indirect cooling by a copper cuff. The occurrence of arcing is being studied as part of evaluation of the assembly design. For a characterization of the dielectric losses a low power measurement in a Fabry-Perot resonator setup at 170 GHz of the bare as-grown diamond disk will be compared with the brazed disk in the window housing. The evaluation of the curvature of the diamond disk is used as indicator of the residual stresses introduced in the joining process.
微波测试的CVD金刚石环面窗口原型iter
在ITER的等离子体工程中,EC发射器将用于中、顶部端口水平。EU正在准备采购上部端口插头,JA正在采购赤道端口插头。这些研究的一部分是验证窗口设计,并确定一个概念是否适用于两个发射器。为此,我们进行了低功率和高功率毫米波的首次实验,并将进行介绍。利用红外成像技术,研究了在JAEA回旋加速器设施中,在170 GHz频率下,高达1 MW的高功率微波载荷下,波纹波导环面窗口组件的高功率RE行为。通过短脉冲和长脉冲实验确定了整个金刚石窗口区域的温度分布和铜袖间接冷却的效率。作为评估装配设计的一部分,正在研究电弧的发生。为了表征介质损耗,将在170 GHz的Fabry-Perot谐振器设置下对裸生长金刚石盘进行低功率测量,并将其与在窗口外壳中钎焊的盘进行比较。金刚石盘曲率的评价被用来作为连接过程中引入的残余应力的指标。
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