Motion analysis of arc spots on tungsten fuzz by means of self-avoiding random walk model. (1st January 2023)

• Record Type: Journal Article
• Authors: Hwangbo, Dogyun; Nishijima, Daisuke; Kajita, Shin; Ohno, Noriyasu
• Is Part Of: Japanese journal of applied physics. Volume 62:Number SA(2023)
• Publication Date: 2023-01-01
• Subjects: nanostructure -- arcing -- random walk -- tungsten -- helium plasma -- fuzz; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac79fe
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Arc spot motions on nanostructrued "fuzz" tungsten surfaces are investigated on the basis of a two-dimensional Monte Carlo random walk simulation. To compare with previous experimental results, the effects of self-avoiding, bifurcation and extinction of arc spots, as well as the fuzz thickness dependence, are included in the simulation. Under a given temporal arc current profile which is set as close as possible to the experiment, the results derived from the simulation reveal that the motion and the number of arc spots depend significantly on the fuzz thickness.