Abstract The use of extrinsic impurities, such as neon (Ne), nitrogen (N2) and argon (Ar) can generate the radiative cooling of the divertor plasma during deuterium-tritium (D-T) operations in a… Click to show full abstract
Abstract The use of extrinsic impurities, such as neon (Ne), nitrogen (N2) and argon (Ar) can generate the radiative cooling of the divertor plasma during deuterium-tritium (D-T) operations in a fusion reactor. In this study, we report on the effect of 50 eV Ar+ ions on W nano-fuzz growth over tungsten (W) targets under large-flux (2.6 × 1022/m2⋅s) helium (He) and Ar ion irradiations. Our measurements show that the serious surface erosion of W divertor is formed due to Ar+ sputtering, and Ar+ sputtering process can significantly suppress the W nano-fuzz growth and decrease the diameter of W nano-fuzz. During Ar+ sputtering microns-sized clusters have been formed over W targets, and our analysis indicates that the surface migration and redeposition of W atoms resulting from sputtering can lead to a significant change in the surface microstructure of W targets.
               
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