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TJ-II:Plasma Wall Interaction: Difference between revisions
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TJ-II:Plasma Wall Interaction (view source)
Revision as of 08:11, 8 September 2009
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== Wall conditioning == | |||
[[File:TJ-II_Lithium_oven.jpg|300px|thumb|right|TJ-II retractable Lithium evaporation oven in action]] | |||
Careful control of wall conditions is essential for successful operation. | |||
<ref>[http://dx.doi.org/10.1016/S0022-3115(00)00490-6 F.L. Tabarés et al, ''Density control and plasma edge characterisation of ECRH heated plasmas in the TJ-II stellarator'', Journal of Nuclear Materials '''290-293''' (2001) 748-752]</ref> | |||
The walls can be coated by various materials, using a set of 4 evaporation ovens: two fixed and two mounted on retractable manipulators. | |||
In the course of time, TJ-II has been operated with the following types of wall: | |||
* Metal wall <ref>[http://dx.doi.org/10.1088/0741-3335/43/8/302 F.L. Tabarés et al, ''Edge characteristics and global confinement of electron cyclotron resonance heated plasmas in the TJ-II Stellarator'', Plasma Phys. Control. Fusion '''43''' (2001) 1023-1037 ]</ref> | |||
* Boron-coated wall <ref>[http://dx.doi.org/10.1016/S0042-207X(02)00211-7 D. Tafalla and F.L. Tabarés, ''First boronization of the TJ-II stellarator'', Vacuum '''67''', Issues 3-4 (2002) 393-397]</ref> (starting 2002) | |||
* Lithium-coated wall <ref>[http://dx.doi.org/10.1088/0741-3335/50/12/124051 F.L. Tabarés at al, ''Plasma performance and confinement in the TJ-II stellarator with lithium-coated walls'', Plasma Phys. Control. Fusion '''50''' (2008) 124051]</ref> <ref>[http://dx.doi.org/10.1016/j.jnucmat.2009.01.224 J. Sánchez et al, ''Impact of lithium-coated walls on plasma performance in the TJ-II stellarator'', Journal of Nuclear Materials '''390-391''' (2009) 852-857]</ref> (starting 2007) | |||
TJ-II was the first stellarator to be operated with Lithium-coated walls. | |||
The lithium coating has led to much improved density control. | |||
== References == | == References == | ||
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