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Report No.

Removal of co-deposited layers by excimer lasers

Shu, Wataru; Kawakubo, Yukio*; Luo, G.; Nishi, Masataka

Recovery of tritium from co-deposited layers is a crucial issue for fusion machines that use carbon as plasma facing materials. In this study, the removal rate of the JT-60 and TFTR co-deposited layers by KrF laser was measured for varying laser energy density. The removal rate of 5.0 $$mu$$m/pulse was achieved for the JT-60 co-deposited layers at the energy density of 11 J/cm$$^{2}$$ for KrF excimer laser. Hydrogen (tritium) was released in the form of hydrogen molecules and readily recovered. The formation of cones due to local surface melting was observed at the KrF laser energy density of 0.8 J/cm$$^{2}$$, whereas strong melting was determined to be the mechanism of the ablative removal of the JT-60 co-deposited layers at the energy density greater than the ablation threshold.



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Category:Nuclear Science & Technology



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