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TJ-II:Vacuum system: Difference between revisions
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[[File:TJ-II_Octant.jpg|400px|thumb|right|An octant of the TJ-II vacuum vessel with its many ports. On the right, part of the groove is visible.]] | |||
[[File:TJ-II_Vacuum_vessel_interior.jpg|400px|thumb|right|Interior view of the TJ-II vacuum vessel during assembly. The [[TJ-II:Coil system|helical coil]], fitting in the groove, is visible on the left.]] | |||
== Vacuum vessel == | == Vacuum vessel == | ||
The all-metal [[TJ-II]] vacuum vessel has a helical geometry and has 96 [[TJ-II:Ports|ports]]. | The all-metal [[TJ-II]] vacuum vessel has a helical geometry and has 96 [[TJ-II:Ports|ports]]. | ||
<ref>M. Baldarelli, A, Cecchini, M, Cucchiaro, et al., ''Vacuum vessel design for the TJ-II Heliac'', [[doi:10.1016/B978-0-444-88508-1.50074-8|Proc. 16th Symposium on Fusion Technology, London, U.K., 3–7 September 1990, 453]]</ref> | |||
<ref>J. Botija and M. Blaumoser, '' Vacuum vessel design for the TJ-II device'', [[doi:10.1109/FUSION.1991.218780|14<sup>th</sup> IEEE/NPSS Symposium on Fusion Engineering '''2''' (1991) 992-995]]</ref> | |||
The vacuum vessel is made of non-magnetic steel (304 LN) with a thickness of 10 mm. | The vacuum vessel is made of non-magnetic steel (304 LN) with a thickness of 10 mm. | ||
The CC/HX coil is outside of the vacuum vessel thanks to a helical groove built into the vessel. | The CC/HX coil is outside of the vacuum vessel thanks to a helical groove built into the vessel. | ||
This groove has a wall thickness of 7 mm for clearance reasons. | This groove has a wall thickness of 7 mm for clearance reasons. | ||
The groove is protected along the entire toroidal circumference against damage due to the bean-shaped plasma by 3 mm stainless steel sheets for low and medium power operation and graphite tiles for high power operation. Furthermore, the vacuum vessel is protected on the areas where the [[TJ-II:Neutral Beam Injection|neutral beams]] deposit a residual shine-through heat flux. | The groove is protected along the entire toroidal circumference against damage due to the bean-shaped plasma by 3 mm stainless steel sheets for low and medium power operation and graphite tiles for high power operation. Furthermore, the vacuum vessel is protected on the areas where the [[TJ-II:Neutral Beam Injection|neutral beams]] deposit a residual shine-through heat flux. | ||
== Vacuum system == | == Vacuum system == | ||
The vacuum vessel is pumped through four symmetrically spaced bottom ports to a base pressure of 10<sup>-8</sup> mbar. Four identical and independent vacuum pumping subsystems are used. | The vacuum vessel is pumped through four symmetrically spaced bottom ports to a base pressure of 10<sup>-8</sup> mbar. Four identical and independent vacuum pumping subsystems are used. | ||
<ref> | <ref>J. Botija et al, '' Vacuum vessel, wall protection, pumping system and poloidal limiters of the Spanish stellarator TJ-II'', [[doi:10.1109/FUSION.1993.518387|15<sup>th</sup> IEEE/NPSS Symposium on Fusion Engineering '''1''' (1993) 529-532]]</ref> | ||
<ref> | <ref>F. Tabarés, ''The vacuum system of the TJ-II stellarator'', [[doi:10.1016/0042-207X(94)90022-1|Vacuum '''45''', Issues 10-11 (1994) 1059-1061]]</ref> | ||
<ref> | <ref>R. Carrasco, '' Hybrid baking system for the vacuum vessel of the Spanish stellarator TJ-II'', [[doi:10.1109/FUSION.1999.849826|Proc. 18<sup>th</sup> Symposium on Fusion Engineering (1999) 231-234]]</ref> | ||
== See also == | |||
* [[TJ-II:Plasma Wall Interaction]] (vessel wall conditioning) | |||
* [[TJ-II:Sectors]] (top view of a model of the vacuum vessel) | |||
[[File:TJ-II_Vacuum_vessel.png|800px|thumb|center|A computer model of the TJ-II vacuum vessel. It can be seen how the plasma hugs the groove of the vessel.]] | |||
== References == | == References == | ||
<references /> | <references /> | ||