Meyer O, Giacalone J C, Gouin A, Pascal J Y, Klepper C C, Fedorczak N, Lotte Ph, Unterberg E A, Fehling D T, Harris J H
CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France.
ORNL, Oak Ridge, Tennessee 37831-6169, USA.
Rev Sci Instrum. 2018 Oct;89(10):10D105. doi: 10.1063/1.5035566.
The present work concerns the measurements obtained with the Tungsten (W) Environment in Steady-state Tokamak (WEST) visible spectroscopy system during the first experimental campaign. This system has been developed in the framework of the WEST project that equipped the existing Tore Supra device with a tungsten divertor in order to test actively cooled tungsten Plasma Facing Components (PFC) in view of preparing for ITER operation. The goal of this diagnostic is to measure the PFC sources and the deuterium recycling with spectral, spatial, and temporal resolution adapted to the predicted power deposition profiles on the objects observed. Three kinds of PFCs are monitored: the Ion Cyclotron Resonance Heating (ICRH) antenna and Low Hybrid Current Drive (LHCD) launcher W limiters; one of the 6 W inner bumpers; and the upper and lower W divertors. Large-aperture in-vessel actively cooled optical systems (f-number ∼ 3) were installed for each view and connected to optical fibres. A total of 240 optical fibers can be distributed on various detection systems including a fast response-time, multi-channel, filtered photodetector-based "Filterscope" system, developed by Oak Ridge National Laboratory (USA) as well as grating spectrometers optimized for multi-sightline analysis. The first WEST experimental campaign conducted in 2017 has been dedicated to plasma start-up development during which the visible spectroscopy system has provided crucial information related to the impurity content first and then impurity sources. The diagnostic setup for that first experimental campaign was limited to the inner bumper and outer limiters but was sufficient to demonstrate that the optical setup was in accordance with the specifications. The radiance calibration procedure allowed us to estimate fluxes from the main limiter of about 8 × 10 atoms/(s m) and to show a first W source radial profile along the outboard limiter.
本工作涉及在稳态托卡马克（WEST）可见光谱系统的首次实验活动期间所获得的测量结果。该系统是在WEST项目框架内开发的，该项目为现有的Tore Supra装置配备了钨偏滤器，以便鉴于为ITER运行做准备而测试主动冷却的钨等离子体面对部件（PFC）。该诊断的目标是通过适应于所观测物体上预测功率沉积分布的光谱、空间和时间分辨率来测量PFC源和氘再循环。监测三种类型的PFC：离子回旋共振加热（ICRH）天线和低杂波电流驱动（LHCD）发射器W限流器；6个W内缓冲器之一；以及上下W偏滤器。为每个视图安装了大孔径的容器内主动冷却光学系统（f数约为3）并连接到光纤。总共240根光纤可分布在各种检测系统上，包括由美国橡树岭国家实验室开发的基于快速响应时间、多通道、滤波光电探测器的“Filterscope”系统以及为多视线路径分析优化的光栅光谱仪。2017年进行的首次WEST实验活动致力于等离子体启动开发，在此期间可见光谱系统首先提供了与杂质含量相关的关键信息，然后是杂质源。首次实验活动的诊断设置仅限于内缓冲器和外限流器，但足以证明光学设置符合规格。辐射校准程序使我们能够估计来自主限流器的通量约为8×10个原子/（秒·平方米），并显示出沿外侧限流器的首个W源径向分布。
