Experimental studies of the interactions between a hydrogen plasma and a carbon or tungsten wall

15th Latin American Workshop on Plasma Physics; 21st IAEA TM on Research Using Small Fusion Devices

Ouaras, K.^1 ; Delacqua, L. Colina^1 ; Quirós, C.^1 ; Lombardi, G.^1 ; Redolfi, M.^1 ; Vrel, D.^1 ; Hassouni, K.^1 ; Bonnin, X.^1

LSPM-CNRS Université Paris 13, Sorbonne Paris Cité, Villetaneuse

F-93490, France^1

关键词: Diagnostic systems;    Electrostatic probe;    Hydrogen plasma exposures;    International thermonuclear experimental reactor;    Milling technique;    Optical spectroscopy;    Plasma-facing components;    Tokamak operation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/591/1/012029/pdf
DOI  :  10.1088/1742-6596/591/1/012029

来源: IOP

【 摘 要 】

We present work done at LSPM (Laboratory of Sciences of Processes and Material Sciences), using the CASIMIR ECR plasma reactor device, aimed at answering questions about hydrogen isotope fuel retention and dust production in the context of the plasma-facing components (PFCs) of the International Thermonuclear Experimental Reactor (ITER). The plasma is characterized by means of optical spectroscopy, mass spectrometry and electrostatic probe; furthermore the dust density and size distribution will be measured by a laser diagnostic system. We present some early results obtained from hydrogen plasma exposure of pure tungsten samples, as well as samples of ITER-relevant tungsten-rich powders, produced inhouse by the ball-milling technique, which are likely to be a by-product of material erosion and migration during tokamak operation. In particular, we have performed measurements of the specific surface area of these powders as a proxy to their capacity to absorb hydrogen.