Abstract
Plasma-facing components (PFCs) in fusion devices inherently suffer from irradiation by hydrogen isotope plasmas. Graphite is used as the first wall of the Korea Superconducting Tokamak Advanced Research (KSTAR) because of its low atomic number and excellent thermal and mechanical properties. In this experiment, the effect of hydrogen-plasma irradiation on the PFCs was studied using KSTAR-like graphite tiles. The tiles were irradiated with low-energy hydrogen plasmas produced by an electron cyclotron resonance system. The changes in the surface morphology and disorders induced in the structure were investigated using field-emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and electron spin resonance measurements.
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