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.
<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>


== Glow Discharge Cleaning ==
== Glow Discharge Cleaning ==

Revision as of 22:52, 20 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".

Wall conditioning

TJ-II retractable Lithium evaporation oven in action

Careful control of wall conditions is essential for successful operation. [4]

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 [5]
  • Boron-coated wall [6] (starting 2002)
  • Lithium-coated wall [7] [8] (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

  1. ↑ R. Carrasco, Hybrid baking system for the vacuum vessel of the Spanishstellarator TJ-II, Proc. 18th Symposium on Fusion Engineering (1999) 231-234
  2. ↑ D. Tafalla and F.L. Tabarés, Journal of Nuclear Materials 290-293 (2001) 1195-1198
  3. ↑ D. Tafalla and F.L. Tabarés, Vacuum 64, Issues 3-4 (2002) 411-415
  4. ↑ F.L. Tabarés et al, Journal of Nuclear Materials 290-293 (2001) 748-752
  5. ↑ F.L. Tabarés et al, Plasma Phys. Control. Fusion 43 (2001) 1023-1037
  6. ↑ D. Tafalla and F.L. Tabarés, Vacuum 67, Issues 3-4 (2002) 393-397
  7. ↑ F.L. Tabarés at al, Plasma Phys. Control. Fusion 50 (2008) 124051
  8. ↑ J. Sánchez et al, Journal of Nuclear Materials 390-391 (2009) 852-857
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