TJ-II:Plasma Wall Interaction

From FusionWiki
Jump to navigation Jump to search

To condition the wall of the TJ-II vacuum vessel, a number of techniques is used.

Glow Discharge Cleaning

Glow discharge cleaning is routinely used at TJ-II. [1] [2]

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. [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

  1. ↑ D. Tafalla and F.L. Tabarés, Journal of Nuclear Materials 290-293 (2001) 1195-1198
  2. ↑ D. Tafalla and F.L. Tabarés, Vacuum 64, Issues 3-4 (2002) 411-415
  3. ↑ F.L. Tabarés et al, Journal of Nuclear Materials 290-293 (2001) 748-752
  4. ↑ F.L. Tabarés et al, Plasma Phys. Control. Fusion 43 (2001) 1023-1037
  5. ↑ D. Tafalla and F.L. Tabarés, Vacuum 67, Issues 3-4 (2002) 393-397
  6. ↑ F.L. Tabarés at al, Plasma Phys. Control. Fusion 50 (2008) 124051
  7. ↑ J. Sánchez et al, Journal of Nuclear Materials 390-391 (2009) 852-857
Retrieved from "http://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:Plasma_Wall_Interaction&oldid=585"