Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4921426 | Fusion Engineering and Design | 2016 | 6 Pages |
Abstract
ELM-like thermal shocks and H/He particle exposure were subsequently applied on tungsten samples. Polished test specimens underwent in the JUDITH 1 electron beam facility 100 transient thermal events with a duration of 1 ms. The absorbed heat flux was 0.4 GW mâ2 and 1.5 GW mâ2, which is above the material's damage threshold. These experiments were done at room temperature and with the samples heated to 400 °C base temperature. Depending on the loading conditions the test specimens have either a crack network or showed surface roughening. The samples were then loaded in the GLADIS facility at different surface temperatures with a mixed H/He beam with a flux of 3.7 Ã 1021 mâ2 sâ1. Post-mortem analysis showed that the roughened surface did not alter the H/He induced surface modifications. In contrast to that on the test specimens that exhibited crack formation, phenomena such as bubble creation along the crack edge, formation of a shallow layer of nano-structures covering the crack opening, and the emerging of a porous structure which partially fills the crack are observed.
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Authors
Nathan Lemahieu, Martin Balden, Stefan Elgeti, Henri Greuner, Jochen Linke, Hans Maier, Gerald Pintsuk, Marius Wirtz, Guido Van Oost, Jean-Marie Noterdaeme,