Probe measurements in the plasma boundary layer
Probe measurements in the plasma boundary layer
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DOI：
10.1016/0022-3115(82)90193-3
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发表时间：
1982-11
影响因子：
3.1
通讯作者：
P. Staib
中科院分区：
文献类型：
--
作者：
P. Staib
已经设计了大量的探针，并用于提高我们的知识的最外层等离子体层，刮除层（SOL）。这种尝试是非常有益的，因为在这个区域发生的过程几乎是未知的，因为一个精确的知识粒子通量和温度是需要的，以便正确地解释等离子体壁的相互作用。第一种包括有源探针，例如朗缪尔探针和粒子分析仪，它们在真实的时间内工作，即，数据在放电期间可用。第二组由被动探头组成，使用暴露于放电的特定收集表面。与照相底片类似，表面保留信息，这些信息随后使用合适的表面分析技术“显影”。这些探针专门用于高灵敏度研究，如杂质分析。这些探头的目的是测量等离子体参数。没有全面的了解所有涉及的过程，使等离子体参数可以从实验数据推导出来。然而，惊人的收敛之间的数据被发现从不同的探头在不同的机器。协议的例子是离子通量的指数下降，从等离子体边缘的距离和不同的离子和电子的温度在SOL。湍流扩散模型给出了一个很好的描述的全球粒子约束时间和SOL的宽度。
A large variety of probes have been designed and used to improve our knowledge of the outermost plasma layer, the Scrape-Off-Layer (SOL). Such attempts are very instructive because the processes occurring in this region are barely known and because a precise knowledge of particle fluxes and temperatures is needed in order to correctly interpret plasma wall interactions.The probe systems are divided into two major groups. The first one includes the active probes, such as the Langmuir probes and particle analyzers, which work in real time, i.e., data is available during the discharge. The second group consists of passive probes, using specific collecting surfaces which are exposed to the discharge. Similar to a photographic plate, the surface keeps the information which is later “developed” using suitable surface analysis techniques. These probes are specifically used for high sensitivity studies such as impurity analysis. The aim of these probes is the measurement of plasma parameters. There is no comprehensive understanding of all involved processes so that plasma parameters can be deduced from experimental data. However, striking convergences are found between the data from different probes in different machines. Examples of agreements are the exponential decrease of ion fluxes with increasing distance from the plasma-edge and the different ion and electron temperatures in the SOL. A turbulent diffusion model is presented which gives a good description of the global particle confinement time and of the width of the SOL.