TJ-II:Plasma Wall Interaction

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

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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