TJ-II:Plasma Wall Interaction: Difference between revisions

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To condition the wall of the [[TJ-II]] vacuum vessel, a number of techniques is used,
To condition the wall of the [[TJ-II]] vacuum vessel, a number of techniques is used,
such as a baking system.
such as a baking system.
<ref>[http://dx.doi.org/10.1109/FUSION.1999.849826 R. Carrasco, '' Hybrid baking system for the vacuum vessel of the Spanishstellarator 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 ==
== Glow Discharge Cleaning ==

Revision as of 06:59, 21 August 2009

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

Glow Discharge Cleaning

Glow discharge cleaning is routinely used at TJ-II. [2] [3]

Limiters

TJ-II is fitted with two mobile limiters. Nevertheless, the main interaction between the plasma and the wall occurs at the central "groove". [4]

Wall conditioning

TJ-II retractable Lithium evaporation oven in action

Careful control of wall conditions is essential for successful operation. [5]

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 [6]
  • Boron-coated wall [7] (starting 2002)
  • Lithium-coated wall [8] [9] (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