The effect of high-flux H plasma exposure with simultaneous transient heat loads on tungsten surface damage and power handling

0439649 - ÚFP 2015 RIV AT eng J - Článek v odborném periodiku
van Eden, G.G. - Morgan, T.W. - van der Meiden, H.J. - Matějíček, Jiří - Chráska, Tomáš - Wirtz, M. - De Temmerman, G.
The effect of high-flux H plasma exposure with simultaneous transient heat loads on tungsten surface damage and power handling.
Nuclear Fusion. Roč. 54, č. 12 (2014), s. 123010-123010. ISSN 0029-5515. E-ISSN 1741-4326
Grant CEP: GA ČR(CZ) GA14-12837S
Institucionální podpora: RVO:61389021
Klíčová slova: ELMs * tungsten * thermal shock * melting * surface analysis * laser * hydrogen
Kód oboru RIV: JG - Hutnictví, kovové materiály
Impakt faktor: 3.062, rok: 2014
http://iopscience.iop.org/0029-5515/54/12/123010/pdf/0029-5515_54_12_123010.pdf

The performance of the full-W ITER divertor may be significantly affected by the interplay between steady-state plasma exposure and transient events. To address this issue, the effect of a high-flux H plasma on the thermal shock response of W to ELM-like transients has been investigated. Transient heating of W targets is performed by means of a high-power Nd:YAG laser with simultaneous exposure to H plasma in the linear device Magnum-PSI. The effects of simultaneous exposure to laser and plasma have been compared to those sequentially and to laser only. Transient melting is found to be aggravated during plasma exposure and to occur at lower heat flux parameters. Roughness and grain growth are observed to be driven by peak temperature, rather than by the loading conditions. The temperature evolution of the W surface under a series of transients is recorded by fast infrared thermography. By accounting for changes in the reflectivity at the damaged surface as measured by ellipsometry
Trvalý link: http://hdl.handle.net/11104/0242865