TJ-II:Vacuum system: Difference between revisions
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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>[http://dx.doi.org/10.1109/FUSION.1991.218780 J. Botija and M. Blaumoser, '' Vacuum vessel design for the TJ-II device'', 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 == | ||
Revision as of 12:25, 1 October 2009
Vacuum vessel
The all-metal TJ-II vacuum vessel has a helical geometry and has 96 ports. [1] 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. 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 neutral beams deposit a residual shine-through heat flux.
Vacuum system
The vacuum vessel is pumped through four symmetrically spaced bottom ports to a base pressure of 10-8 mbar. Four identical and independent vacuum pumping subsystems are used. [2] [3] [4]
References
- ↑ J. Botija and M. Blaumoser, Vacuum vessel design for the TJ-II device, 14th IEEE/NPSS Symposium on Fusion Engineering 2 (1991) 992-995
- ↑ J. Botija et al, Vacuum vessel, wall protection, pumping system and poloidal limiters of the Spanish stellarator TJ-II, 15th IEEE/NPSS Symposium on Fusion Engineering 1 (1993) 529-532
- ↑ F. Tabarés, The vacuum system of the TJ-II stellarator, Vacuum 45, Issues 10-11 (1994) 1059-1061
- ↑ R. Carrasco, Hybrid baking system for the vacuum vessel of the Spanish stellarator TJ-II, Proc. 18th Symposium on Fusion Engineering (1999) 231-234