Tungsten response to transient heat loads generated by laser pulses

摘要

Tungsten (W) has been selected as a plasma-facing component (PFC) material in the activated phase of ITER. High melting point and thermal conductivity and low erosion rate and low tritium inventory are the major advantages of W material, which makes it suitable for plasma fusion technology. However, ductile-to-brittle transition is also a major drawback of W, which could produce large macroscopic particles as well as small dust particles. The emission of dust particles from W are found to persist for longer duration compared to plasma lifetime with velocities of several tens m/s. The lifetime of the PFCs also depends on ELMs, VDEs, disruptions and runaway electrons.