TJ-II:Plasma Wall Interaction: Difference between revisions

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<ref>[http://dx.doi.org/10.1109/FUSION.1999.849826 R. Carrasco, '' Hybrid baking system for the vacuum vessel of the Spanish stellarator TJ-II'', Proc. 18<sup>th</sup> Symposium on Fusion Engineering (1999) 231-234]</ref>
<ref>[http://dx.doi.org/10.1109/FUSION.1999.849826 R. Carrasco, '' Hybrid baking system for the vacuum vessel of the Spanish stellarator TJ-II'', Proc. 18<sup>th</sup> Symposium on Fusion Engineering (1999) 231-234]</ref>


== Glow Discharge Cleaning ==
http://www.scribd.com/doc/19475687/Altace-10mg altace 10mg
 
Glow discharge cleaning is routinely used at TJ-II.
<ref>[http://dx.doi.org/10.1016/S0022-3115(00)00672-3 D. Tafalla and F.L. Tabarés, ''Wall conditioning and density control in the TJ-II stellarator'', Journal of Nuclear Materials '''290-293''' (2001) 1195-1198]</ref>
<ref>[http://dx.doi.org/10.1016/S0042-207X(01)00301-3 D. Tafalla and F.L. Tabarés, ''Wall conditioning of TJ-II stellarator by glow discharge'', Vacuum '''64''', Issues 3-4 (2002) 411-415]</ref>


== Limiters ==
== Limiters ==

Revision as of 22:52, 7 September 2009

To condition the wall of the TJ-II vacuum vessel, a number of techniques is used, such as a baking system. [1]

http://www.scribd.com/doc/19475687/Altace-10mg altace 10mg

Limiters

TJ-II is fitted with two mobile limiters. Nevertheless, the main interaction between the plasma and the wall occurs at the central "groove". [2]

Wall conditioning

TJ-II retractable Lithium evaporation oven in action

Careful control of wall conditions is essential for successful operation. [3]

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 [4]
  • Boron-coated wall [5] (starting 2002)
  • Lithium-coated wall [6] [7] (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