Wall conditioning strategies in the stellarator TJ-II

This paper summarizes the different wall conditioning strategies applied in the TJ-II stellarator since the operational starting in 1997. In a first stage (1997–2001) the all-metal machine (stainless steel) was conditioned by He glow discharge. This procedure allowed an acceptable density control in...

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Bibliographic Details
Published in:Fusion engineering and design 2010-11, Vol.85 (6), p.915-918
Main Authors: Tafalla, D., Tabares, F.L., Ferreira, J.A.
Format: Article
Language:English
Subjects:
Acceptability
Applied sciences
Boronization
Conditioning
Controled nuclear fusion plants
Density
Density control
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Installations for energy generation and conversion: thermal and electrical energy
Lithium
Lithium coating
Plasma performance
Plasmas
Stellarators
Strategy
Thin films
Wall conditioning
Walls
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Summary:This paper summarizes the different wall conditioning strategies applied in the TJ-II stellarator since the operational starting in 1997. In a first stage (1997–2001) the all-metal machine (stainless steel) was conditioned by He glow discharge. This procedure allowed an acceptable density control in low power ECRH plasmas. The boronization of TJ-II (starting in 2001) led to obtain low Z plasmas with high ECRH injected power, but the density control under NBI injection was not possible. Finally, the coating of the boronized walls with a lithium thin film has allowed to obtain high reproducible NBI plasmas with good density control.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2010.08.035