Multiple-tracer TESPEL injection for studying impurity behavior in a magnetically-confined plasma
Multiple-tracer TESPEL injection for studying impurity behavior in a magnetically-confined plasma
复制标题
多示踪剂 TESPEL 注射用于研究磁约束等离子体中的杂质行为
DOI：
10.1088/0029-5515/52/6/063012
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Hisamichi Funaba and LHD Experiment Group
中科院分区：
文献类型：
--
作者：
Shigeru Sudo;Naoki Tamura;Chihiro Suzuki;Sadatsugu Muto;Hisamichi Funaba and LHD Experiment Group
本文提出了一种新的磁约束等离子体中杂质行为的诊断方法--示踪剂封装固体小球注入法。如果颗粒含有多种示踪剂，则可以在相同的等离子体条件下同时比较不同杂质的行为。我们将TESPEL注入大型螺旋器械，主要使用三重示踪剂：钒（V）、锰（Mn）和钴（Co）。同时观察到这些示踪剂的真空紫外区类Li线和软X射线区Kα线，时间分辨率为50 ms。由于本征杂质Cr和Fe的核电荷介于示踪剂之间，通过知道示踪剂颗粒的数量以及通过比较由于电子温度变化引起的发射强度变化，可以定量地研究Cr和Fe的行为。当等离子体密度大于5× 1019 m-3时，示踪杂质仍保留在等离子体芯区。当等离子体密度高于同一水平时，本征杂质不能进入芯区，尽管这两种现象似乎是独立的。
A new diagnostic method with tracer-encapsulated solid pellet (TESPEL) injection with multiple tracers is developed to study impurity behaviour in a magnetically confined plasma. If a pellet contains multiple tracers, it becomes possible to compare the behaviour of different impurities simultaneously under the same plasma conditions. We injected a TESPEL into the Large Helical Device mainly with triple tracers: vanadium (V), manganese (Mn) and cobalt (Co). The Li-like lines in the vacuum ultraviolet range and the Kα lines in the soft x-ray range from these tracers are simultaneously observed with a time resolution of 50 ms. As the charges of the nuclei of intrinsic impurities, chromium (Cr) and iron (Fe), are in between those of the tracers, the behaviour of Cr and Fe can be studied quantitatively by knowing the number of tracer particles and also by comparing the emission intensity change due to the electron temperature change. It is observed that the tracer impurities remain in the plasma core region when the plasma density is higher than 5× 10 19 m− 3. It is also observed that the intrinsic impurities cannot enter the core region when the plasma density is higher than the same level, although the two phenomena appear to be independent.