Effects of repeated short heat pulses on tungsten

Effects of ELM-like repeated short heat pulses on tungsten have been studied by using a fundamental wave (wave length of 1064nm, the pulse length of 130μs) of a Nd/YAG laser. Tungsten temperature was 773K or 473K. The energy absorption rate of the laser light was about 30% for mirror-finished surfac...

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Bibliographic Details
Published in:	Journal of nuclear materials Vol. 417; no. 1-3; pp. 487 - 490
Main Authors:	Kurehashi, H., Ohtsuka, Y., Ueda, Y., Kurishita, H.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Amsterdam Elsevier B.V 01-10-2011 Elsevier
Subjects:	Applied sciences Controled nuclear fusion plants Energy Energy. Thermal use of fuels Exact sciences and technology Fission nuclear power plants Fuels Installations for energy generation and conversion: thermal and electrical energy Nuclear fuels Impurity Tungsten Surface layer Laser Edge localized modes Energy absorption Carbon Crack Nuclear reactor
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Summary:	Effects of ELM-like repeated short heat pulses on tungsten have been studied by using a fundamental wave (wave length of 1064nm, the pulse length of 130μs) of a Nd/YAG laser. Tungsten temperature was 773K or 473K. The energy absorption rate of the laser light was about 30% for mirror-finished surface. After 10,000 shots at an incident energy fluence of 7J/cm2 (melting threshold was about 150J/cm2), the cracks formation was still observed. Surface roughening and cracking were more pronounced for tungsten samples with surface impurity mixing layers (carbon and oxygen).
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0022-3115 1873-4820
DOI:	10.1016/j.jnucmat.2010.12.123