Abstract
The thermal diffusion of nanostructured W fuzz layers formed over W divertor targets due to fusion-relevant He + irradiations remain unclear so far. By analyzing the collision process of energetic He + and D + ions in the fuzz layers, we have calculated the temperature distribution and heat flux of fuzz layers under low-energy (10–200 eV) and high-flux (10 22 –10 25 /m 2 ⋅s) He + /D + irradiations. Both the heat flux of fuzz layers and the temperature difference ( Δ T ) between the top and bottom of fuzz layers are determined by the radius of W nanofibers, the thickness of fuzz layers, and the heat load over W targets. Our simulation predicts that under fusion-relevant He + /D + irradiations at the energy of < 100 eV and the flux of < 1.0 × 10 24 /m 2 ⋅s, Δ T is lower than 35 K when the heat load over the divertor varies in the range of < 10 MW/m 2 . Under the fusion-relevant He + /D + irradiations, the heat flux of nanostructured fuzz layers is about 13–19% of the extremely high heat load over the W targets, indicating that the fuzz layers over W divertor targets can be very important for decreasing the extremely high heat load, such as type – I edge localized modes in the fusion device.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
