Journal
PHYSICA SCRIPTA
Volume T170, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0031-8949/2017/T170/014004
Keywords
laser-induced breakdown spectroscopy; plasma wall interaction; fuel retention; deposition; erosion
Categories
Funding
- National Magnetic Confinement Fusion Science Program of China [2013GB109005]
- National Science Foundation of China [11475039, 11605023]
- China Postdoctoral Science Foundation [2016M591423, 2017T100172]
- Fundamental Research Funds for the Central Universities [DUT15RC(3)072, DUT16TD13]
- Euratom research and training programme [633053]
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Laser-induced breakdown spectroscopy (LIBS) is a well-established elemental composition analysis method as well as one of the most promising candidates for in situ first wall diagnosis of fusion devices. In this work, limiter graphite tiles, which were exposed in the initial operational phase (OP1.1) of the Wendelstein 7-X stellarator to He and H plasma, are analyzed ex situ by LIBS employing a picosecond pulsed laser for the first time and compared with post mortem analysis techniques. Depth profiles of each element and 2D profile of the ratio of H and C atoms on the surface are investigated. Both H content and retention depth on the deposition dominated zone are higher than on the erosion dominated zone due to the formation of C-H co-deposition layer. The results from LIBS are in agreement with those from the cross-sectional scanning electron microscopic image and electron dispersive x-ray spectroscopy.
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