Mobilization of tungsten dust by electric forces and its bearing on tritiated particles in the ITER tokamak |
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| Institution: | 1. Institute of Plasma Physics Chinese Academy of Sciences, Hefei 230026, Anhui, China;2. National Institute for Fusion Science, Toki 509-5292, Gifu, Japan;3. Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu, Japan;1. CEA, IRFM, Saint-Paul-Lez-Durance,F-13108, France;2. National Fusion Research Institute, 113 Gwahangno, YuSung-Gu, Daejeon 305-333, Republic of Korea;3. Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea;4. Impurity and Edge plasma Research Center, KAIST, Daejeon 34141, Republic of Korea |
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| Abstract: | Experimental investigations on the electric field strength required to overcome the adhesion forces of micron size tungsten metallic dust as well as silver and aluminum oxide in powdery form deposited on a conductive surface are presented. The results reveal a strong influence of particulate surface properties on the detachment threshold, especially for tungsten particles which exhibit a thin surface oxide layer that screens their electrical conductivity. Such tungsten particles makes possible that electrostatic self-charging occurs when tritiated because of their dielectric properties even if there are deposited on a conductive grounded surface. |
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