NDLI: Resolving interactions between ion-cyclotron range of frequencies heating and the scrape-off layer plasma in EAST using divertor probes

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Resolving interactions between ion-cyclotron range of frequencies heating and the scrape-off layer plasma in EAST using divertor probes

Content Provider	Scilit
Author	Perkins, R. J. Hosea, Joel C. Taylor, G. Bertelli, Nicola Kramer, Gerrit J. Luo, Zheng Ping Qin, Chengming Wang, Liang Xu, Jichan Zhang, Xinjun
Copyright Year	2018
Description	Journal: Plasma Physics and Controlled Fusion Tokamak heating using waves in the ion cyclotron range of frequencies (ICRF) is known to interact strongly with the scrape-off layer (SOL) plasma, potentially limiting ICRF performance. We present the effect of ICRF heating on triple-probe signals in the EAST experiment, an advanced superconducting tokamak with two ICRF antennas and twelve megawatts of ICRF source power in support of high-power and long-pulse operation. Applying time-resolved magnetic mapping to the divertor probe arrays enables detailed sensing of the spatial structure of the SOL modifications. We observe a sharp transition in floating potential from negative to positive over a length scale of a centimeter at a major radius just inboard of the ICRF antenna. The largest changes in floating potential are observed not for probes connecting to the active ICRF antennas but rather to the main limiter or limiters for inactive lower-hybrid launchers. Ion saturation current can be greatly reduced for probes mapping just in front of an antenna. Where relevant, comparison to results from the National Spherical Torus Experiment are made. This work will provide insight into sputtering, impurity production, and antenna coupling as higher ICRF power levels are attempted on EAST.
Related Links	http://iopscience.iop.org/article/10.1088/1361-6587/aaf69c/pdf
ISSN	07413335
e-ISSN	13616587
DOI	10.1088/1361-6587/aaf69c
Journal	Plasma Physics and Controlled Fusion
Issue Number	4
Volume Number	61
Language	English
Publisher	IOP Publishing
Publisher Date	2018-12-06
Access Restriction	Open
Subject Keyword	Journal: Plasma Physics and Controlled Fusion Nuclear Energy and Engineering Icrf Antennas Icrf Source Superconducting Tokamak Inactive Lower
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Nuclear Energy and Engineering

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