Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Regular Articles
Visualized Blow-off from Helium Irradiated Tungsten in Response to ELM-like Heat Load
Shin KAJITANoriyasu OHNOWataru SAKAGUCHIMakoto TAKAGI
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2009 Volume 4 Pages 004

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Abstract

Laser-induced blow-off from a tungsten surface that was exposed to helium plasma is investigated experimentally in the divertor simulator NAGDIS-II. The pulse width of the laser is submillisecond and is similar to the duration of type-I edge localized modes in ITER. The temporal evolution of blow-off particles, which are visualized by the electron impact excitation in the surrounding plasma, is investigated by using filter spectroscopy. We demonstrate the effect of helium irradiation damages on the tungsten ejection behavior in response to a transient heat load.

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© 2009 by The Japan Society of Plasma Science and Nuclear Fusion Research
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