TJ-II:Magnetics: Difference between revisions
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TJ-II is fitted with an ample set of Mirnov coils: | TJ-II is fitted with an ample set of Mirnov coils: | ||
<ref>[http://www.new.ans.org/pubs/journals/fst/a_1283 R. Jiménez-Gómez et al., Fusion Science and Technology '''51''', 20 (2007)]</ref> | <ref>[http://www.new.ans.org/pubs/journals/fst/a_1283 R. Jiménez-Gómez et al., Fusion Science and Technology '''51''', 20 (2007)]</ref> | ||
* Two straight arrays above the plasma column, each with 12 coils | * Two straight arrays above the plasma column, each with 12 coils, distributed in 4 groups of 3 coils each, separated by a distance of 30 mm. The three coils in each group measure the three cylindrical components (''R'', ''Z'', and ''φ'') of the magnetic field, mounted in a 0.5 mm thick stainless steel tube attached to a port flange. They are located in [[TJ-II:Sectors|sectors]] B5 and C4, at ''φ'' = 142 and 218 degrees. | ||
* One poloidal array with 15 coils measuring the poloidal field component. This array is located between [[TJ-II:Sectors|sectors]] D4 and D5, at ''φ'' = 315 degrees. | * One poloidal array with 15 coils measuring the poloidal field component. This array is located between [[TJ-II:Sectors|sectors]] D4 and D5, at ''φ'' = 315 degrees. | ||
Revision as of 08:49, 17 August 2009
Mirnov coils
TJ-II is fitted with an ample set of Mirnov coils: [1]
- Two straight arrays above the plasma column, each with 12 coils, distributed in 4 groups of 3 coils each, separated by a distance of 30 mm. The three coils in each group measure the three cylindrical components (R, Z, and φ) of the magnetic field, mounted in a 0.5 mm thick stainless steel tube attached to a port flange. They are located in sectors B5 and C4, at φ = 142 and 218 degrees.
- One poloidal array with 15 coils measuring the poloidal field component. This array is located between sectors D4 and D5, at φ = 315 degrees.
Rogowski coils
Two Rogowski coils have been installed in sectors A5 (148.7°) and B4 (211.3°). Since the coils have to surround the plasma column completely, they are located under the protecting tiles of the groove that runs toroidally all along the vacuum vessel. For this purpose, 2 mm deep channels were machined on the vacuum side of the groove, at the above mentioned poloidal cross sections, in order to allow enough space for the coils.
Diamagnetic loops
Two internal diamagnetic loops are installed at φ = 135º and 225º. They consist of a main loop which encircles the plasma column and runs under the protecting tiles in the groove region and a compensating loop which measures only the vacuum magnetic flux.