Response of fusion plasma-facing materials to nanosecond pulses of extreme ultraviolet radiation

0499952 - FZÚ 2019 RIV US eng J - Journal Article
Straus, J. - Kolacek, K. - Schmidt, J. - Frolov, O. - Vilémová, M. - Matějíček, J. - Jäger, Aleš - Juha, Libor - Toufarová, Martina - Choukourov, A. - Kasuya, K.
Response of fusion plasma-facing materials to nanosecond pulses of extreme ultraviolet radiation.
Laser and Particle Beams. Roč. 36, č. 3 (2018), s. 293-307. ISSN 0263-0346. E-ISSN 1469-803X
R&D Projects: GA MŠMT LG15013; GA ČR(CZ) GA14-29772S; GA MŠMT LM2015087
Institutional support: RVO:68378271
Keywords : interaction of XUV with matter * plasma-facing materials * XUV radiation resistance
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.194, year: 2018

The experimental study of damage to tungsten (W), molybdenum (Mo), and silicon carbide (SiC) surfaces induced by focused extreme ultraviolet laser radiation (λ ∼ 47 nm/∼1.5 ns/21–40 μJ) is presented. It was found that W and Mo behaved similarly: during the first shot, the damaged area is covered by melted and re-solidified material, in which circular holes appear. Next cracks and ruptures appear and the W has a tendency to delaminate its surface layer. Contrary, single-crystalline SiC has negligible porosity and sublimates, and moreover, at sublimating temperature decomposes to elements. The surface morphology was investigated by an atomic force microscope, the surface structure was imaged by a scanning electron microscope (SEM), and the structure below the surface was visualized by SEM directed into a trench that is milled by focused ion beam. Additionally, structural changes in SiC were revealed by Raman spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0292137