To understand formation of W-C mixed materials in fusion devices, the dynamics of W sputtering and C implantation was studied using simultaneous C-D ion beam experiments. The system develops into two steady state regimes of continuous W erosion or continuous C layer growth depending on the parameter varied. The W sputtering behavior can be fully parameterized by the implanted carbon amount, effectively reducing the problem to one parameter. At RT, a synergistic effect of chemical sputtering process was observed. At elevated temperature, the system can be modeled successfully by the binary collision approximation model (TRIDYN) by using lower C-C surface binding energies obtained from experimental C self-sputtering yields. The developed understanding can be used to better model the erosion and re-deposition processes in future fusion reactors and corresponding implication on component lifetime and tritium inventory issues.
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To understand formation of W-C mixed materials in fusion devices, the dynamics of W sputtering and C implantation was studied using simultaneous C-D ion beam experiments. The system develops into two steady state regimes of continuous W erosion or continuous C layer growth depending on the parameter varied. The W sputtering behavior can be fully parameterized by the implanted carbon amount, effectively reducing the problem to one parameter. At RT, a synergistic effect of chemical sputtering proc...
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