Xu J C, Wang L, Xu G S, Luo G N, Yao D M, Li Q, Cao L, Chen L, Zhang W, Liu S C, Wang H Q, Jia M N, Feng W, Deng G Z, Hu L Q, Wan B N, Li J, Sun Y W, Guo H Y
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
Rev Sci Instrum. 2016 Aug;87(8):083504. doi: 10.1063/1.4960181.
In order to withstand rapid increase in particle and power impact onto the divertor and demonstrate the feasibility of the ITER design under long pulse operation, the upper divertor of the EAST tokamak has been upgraded to actively water-cooled, ITER-like tungsten mono-block structure since the 2014 campaign, which is the first attempt for ITER on the tokamak devices. Therefore, a new divertor Langmuir probe diagnostic system (DivLP) was designed and successfully upgraded on the tungsten divertor to obtain the plasma parameters in the divertor region such as electron temperature, electron density, particle and heat fluxes. More specifically, two identical triple probe arrays have been installed at two ports of different toroidal positions (112.5-deg separated toroidally), which can provide fundamental data to study the toroidal asymmetry of divertor power deposition and related 3-dimension (3D) physics, as induced by resonant magnetic perturbations, lower hybrid wave, and so on. The shape of graphite tip and fixed structure of the probe are designed according to the structure of the upper tungsten divertor. The ceramic support, small graphite tip, and proper connector installed make it possible to be successfully installed in the very narrow interval between the cassette body and tungsten mono-block, i.e., 13.5 mm. It was demonstrated during the 2014 and 2015 commissioning campaigns that the newly upgraded divertor Langmuir probe diagnostic system is successful. Representative experimental data are given and discussed for the DivLP measurements, then proving its availability and reliability.
为了承受粒子和功率对偏滤器的快速增加的冲击，并证明ITER设计在长脉冲运行下的可行性，自2014年运行周期以来，EAST托卡马克的上部偏滤器已升级为主动水冷、类似ITER的钨单块结构，这是托卡马克装置上针对ITER的首次尝试。因此，设计并成功升级了一种新的偏滤器朗缪尔探针诊断系统（DivLP），用于在钨偏滤器上获取偏滤器区域的等离子体参数，如电子温度、电子密度、粒子通量和热通量。更具体地说，两个相同的三探针阵列已安装在不同环向位置的两个端口（环向间隔112.5度），这可以提供基础数据来研究由共振磁扰动、低杂波等引起的偏滤器功率沉积的环向不对称性以及相关的三维（3D）物理现象。探针的石墨尖端形状和固定结构是根据上部钨偏滤器的结构设计的。陶瓷支撑、小石墨尖端和合适的连接器的安装使得它能够成功安装在盒体和钨单块之间非常狭窄的间隙中，即13.5毫米。在2014年和2015年的调试运行期间证明，新升级的偏滤器朗缪尔探针诊断系统是成功的。给出并讨论了DivLP测量的代表性实验数据，从而证明了其可用性和可靠性。
