Journal
NUCLEAR FUSION
Volume 54, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0029-5515/54/1/012002
Keywords
plasma-facing components (PFCs); ITER; tungsten; surface erosion
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Funding
- National Science Foundation (NSF) Partnerships for International Research and Education (PIRE) programme [1243490]
- US Department of Energy, Office of Fusion Energy sciences
- Office Of The Director
- Office Of Internatl Science &Engineering [1243490] Funding Source: National Science Foundation
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The damage and erosion of plasma-facing components (PFCs) due to extremely high heat loads and particle bombardment is a key issue for the nuclear fusion community. Currently high current ion and electron beams are used in laboratories for simulating the behaviour of PFC materials under ITER-like conditions. Our results indicate that high-power nanosecond lasers can be used for laboratory simulation of high heat flux PFC material degradation. We exposed tungsten (W) surfaces with repetitive laser pulses from a nanosecond laser with a power density similar to a few GW cm(-2). Emission spectroscopic analysis showed that plasma features at early times followed by intense particle emission at later times. Analysis of laser-exposed W surface demonstrated cracks and grain structures. Our results indicate that the typical particle emission features from laser-irradiated tungsten are consistent with high-power particle beam simulation results.
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