TJ-II:Magnetics: Difference between revisions
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<ref>[http://www-fusion.ciemat.es/SW2005/conferences/madison99/Papers/Ascsibar.pdf E. Ascasíbar et al, ''Energy content and magnetic configuration scan in TJ-II plasmas'', 12<sup>th</sup> Int. Stell. Workshop (1999)]</ref> | <ref>[http://www-fusion.ciemat.es/SW2005/conferences/madison99/Papers/Ascsibar.pdf E. Ascasíbar et al, ''Energy content and magnetic configuration scan in TJ-II plasmas'', 12<sup>th</sup> Int. Stell. Workshop (1999)]</ref> | ||
<ref>[http://www.new.ans.org/pubs/journals/fst/a_1283 R. Jiménez-Gómez et al., ''Analysis of Magnetohydrodynamic Instabilities in TJ-II Plasmas'', Fusion Science and Technology '''51''', 20 (2007)]</ref> | <ref>[http://www.new.ans.org/pubs/journals/fst/a_1283 R. Jiménez-Gómez et al., ''Analysis of Magnetohydrodynamic Instabilities in TJ-II Plasmas'', Fusion Science and Technology '''51''', 20 (2007)]</ref> | ||
* Two straight arrays above the plasma column, each with 12 coils, mounted in a 0.5 mm thick stainless steel tube attached to a port flange. The 12 coils are 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. They are located in [[TJ-II:Sectors|sectors]] B5 and C4, at ''φ'' = 232° and 308°. | * Two straight arrays above the plasma column, each with 12 coils, mounted in a 0.5 mm thick stainless steel tube attached to a port flange. The 12 coils are 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. They are located in [[TJ-II:Sectors|sectors]] B5 and C4, at ''φ'' = 232° and 308°. The signals in the [[TJ-II:Shot database|TJ-II database]] corresponding to the B5 coils are called 'MIB5xy', where 'x' is 'R', 'F' (φ), or 'Z', and 'y' is the coil number. | ||
* 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'' = 45°. | * 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'' = 45°. The signals in the [[TJ-II:Shot database|TJ-II database]] corresponding to these coils are called 'MID5Px', where 'x' is the coil number. | ||
== Rogowski coils == | == Rogowski coils == | ||
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[[File:TJ-II_Diamagnetic_loop.jpg|200px|thumb|left|TJ-II diamagnetic loop]] | [[File:TJ-II_Diamagnetic_loop.jpg|200px|thumb|left|TJ-II diamagnetic loop]] | ||
Two internal diamagnetic loops are installed | Two internal diamagnetic loops are installed in [[TJ-II:Sectors|sector]] A5 (135°) and B4 (225°). | ||
They consist of a main loop which encircles the plasma column | 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 | and runs under the protecting tiles in the groove region and a compensating loop which | ||
Revision as of 13:06, 5 November 2009
Mirnov coils
TJ-II is fitted with an ample set of Mirnov coils: [1] [2]
- Two straight arrays above the plasma column, each with 12 coils, mounted in a 0.5 mm thick stainless steel tube attached to a port flange. The 12 coils are 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. They are located in sectors B5 and C4, at φ = 232° and 308°. The signals in the TJ-II database corresponding to the B5 coils are called 'MIB5xy', where 'x' is 'R', 'F' (φ), or 'Z', and 'y' is the coil number.
- One poloidal array with 15 coils measuring the poloidal field component. This array is located between sectors D4 and D5, at φ = 45°. The signals in the TJ-II database corresponding to these coils are called 'MID5Px', where 'x' is the coil number.
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.
The signals 'Ip_a5_' and 'Ip_b4_' in the TJ-II database provide the corresponding measurements of the net plasma current.
Diamagnetic loops
Two internal diamagnetic loops are installed in sector A5 (135°) and B4 (225°). 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.
The signals 'W_a5_corr' and 'W_b4_corr' in the TJ-II database return the energy content of the plasma, based on the diamagnetic loop in sectors A5 and B4, corrected for the net plasma current.