The plasma focus as a tool for plasma-wall-interaction studies

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

Ramos, G.^1 ; Martinez, M.^2 ; Herrera, J.J.E.^2 ; Castillo, F.^3

Instituto Politecnico Nacional, CICATA Unidad Queretaro, Queretaro

76090, Mexico^1

Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico^2

Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Mexico^3

关键词: Candidate materials;    Dense magnetized plasma;    Magnetized plasmas;    Plasma parameter;    Plasma simulators;    Plasma temperature;    Plasma wall interaction;    Triple langmuir probes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/591/1/012031/pdf
DOI  :  10.1088/1742-6596/591/1/012031

来源: IOP

【 摘 要 】

The study of the interaction of magnetized plasmas with candidate materials for fusion reactors, as for example tungsten, is a main topic in fusion research. Many studies simulate the plasma wall interaction using ion beams, while only a few use plasma simulators. Plasma foci can produce dense magnetized plasmas of deuterium and helium among other species. We used the plasma focus Fuego-Nuevo II, to expose tungsten samples to deuterium and helium plasmas. The samples were analysed by means of SEM, RBS and NRA, evidencing surface erosion, surface melting and retention of deuterium in a shallow surface layer of 250 nm amounting 6.5•1016D/cm2. The plasma temperature has been measured at the position of the samples using a triple Langmuir probe and compared to calculations of a snowplow model. The modelling of the electrode to reach desired plasma parameters is discussed.