Leggate H J, Lisgo S W, Harrison J R, Elmore S, Allan S Y, Gaffka R C, Stephen R C, Turner M M
School of Physical Sciences and National Centre for Plasma Science and Technology, Dublin City University, Glasnevin, Dublin, Ireland.
ITER Organisation, FST, Route de Vinon, CS 90 046, 13067 Saint Paul Lez Durance Cedex, France.
Rev Sci Instrum. 2014 Dec;85(12):123503. doi: 10.1063/1.4903352.
The operation of next-generation fusion reactors will be significantly affected by impurity transport in the scrape-off layer (SOL). Current modelling efforts are restricted by a lack of detailed data on impurity transport in the SOL. In order to address this, a carbon injector has been designed and installed on the Mega Amp Spherical Tokamak (MAST). The injector creates short lived carbon plumes originating at the MAST divertor lasting less than 50 μs. High voltage capacitor banks are used to create a discharge across concentric carbon electrodes located in a probe mounted on the Divertor Science Facility in the MAST lower divertor. This results in a very short plume duration allowing observation of the evolution of the plume and precise localisation of the plume relative to the X-point on MAST. The emission from the carbon plume was imaged using fast visible cameras filtered in order to isolate the carbon II and carbon III emission lines centered around 514 nm and 465 nm.
下一代聚变反应堆的运行将受到刮削层（SOL）中杂质输运的显著影响。目前的建模工作因缺乏关于SOL中杂质输运的详细数据而受到限制。为了解决这一问题，已在兆安球形托卡马克（MAST）上设计并安装了一个碳注入器。该注入器会产生源自MAST偏滤器的短暂碳羽流，持续时间不到50微秒。高压电容器组用于在位于MAST下部偏滤器的偏滤器科学设施上安装的探头中的同心碳电极之间产生放电。这导致羽流持续时间非常短，从而能够观察羽流的演变以及羽流相对于MAST上X点的精确定位。使用经过滤的快速可见相机对碳羽流的发射进行成像，以分离出以514纳米和465纳米为中心的碳II和碳III发射线。
