TJ-II:Plasma Wall Interaction: Difference between revisions

From FusionWiki
Jump to navigation Jump to search
Line 5: Line 5:
http://www.scribd.com/doc/19475687/Altace-10mg altace 10mg
http://www.scribd.com/doc/19475687/Altace-10mg altace 10mg


== Limiters ==
http://www.scribd.com/doc/19475687/Altace-10mg altace 10mg
 
TJ-II is fitted with two mobile [[TJ-II:Limiter|limiters]]. Nevertheless, the main interaction between the plasma and the wall occurs at the central "groove".
<ref>[http://dx.doi.org/10.1109/FUSION.1993.518387 J. Botija et al, ''Vacuum vessel, wall protection, pumping system and poloidallimiters of the Spanish stellarator TJ-II'', 15<sup>th</sup> IEEE/NPSS Symposium on Fusion Engineering, Vol. 1 (1993) 529-532]</ref>


== Wall conditioning ==
== Wall conditioning ==

Revision as of 00:58, 8 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

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

Wall conditioning

TJ-II retractable Lithium evaporation oven in action

Careful control of wall conditions is essential for successful operation. [2]

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 [3]
  • Boron-coated wall [4] (starting 2002)
  • Lithium-coated wall [5] [6] (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 Spanish stellarator TJ-II, Proc. 18th Symposium on Fusion Engineering (1999) 231-234
  2. ↑ F.L. Tabarés et al, Density control and plasma edge characterisation of ECRH heated plasmas in the TJ-II stellarator, Journal of Nuclear Materials 290-293 (2001) 748-752
  3. ↑ F.L. Tabarés et al, Edge characteristics and global confinement of electron cyclotron resonance heated plasmas in the TJ-II Stellarator, Plasma Phys. Control. Fusion 43 (2001) 1023-1037
  4. ↑ D. Tafalla and F.L. Tabarés, First boronization of the TJ-II stellarator, Vacuum 67, Issues 3-4 (2002) 393-397
  5. ↑ F.L. Tabarés at al, Plasma performance and confinement in the TJ-II stellarator with lithium-coated walls, Plasma Phys. Control. Fusion 50 (2008) 124051
  6. ↑ J. Sánchez et al, Impact of lithium-coated walls on plasma performance in the TJ-II stellarator, 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=1228"