TJ-II:Magnetics - Revision history

Admin: /* Mirnov coils */

2023-05-13T06:08:35Z

Mirnov coils

← Older revision		Revision as of 08:08, 13 May 2023
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	* One straight array in [[TJ-II:Sectors\|sector]] C4, at ''φ'' = 308°.		* One straight array in [[TJ-II:Sectors\|sector]] C4, at ''φ'' = 308°.
	* 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. This array has been enhanced by 10 additional coils (5 at each end).		* 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. This array has been enhanced by 10 additional coils (5 at each end).
	* Two toroidal arrays (installed 2018)		* Two toroidal arrays (installed 2018) <ref>E. Ascasíbar et al., ''Measurements of magnetic field fluctuations in TJ-II plasmas with new in-vessel helical arrays of magnetic coils'', [[doi:10.1063/5.0102037\|Rev. Sci. Instrum. '''93''' (2022) 093508]]</ref>

	== Rogowski coils ==		== Rogowski coils ==

Admin: /* Rogowski coils */

2022-04-19T07:47:48Z

Rogowski coils

← Older revision		Revision as of 09:47, 19 April 2022
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	Two Rogowski coils have been installed in [[TJ-II:Sectors\|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 [[TJ-II:Vacuum system\|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.		Two Rogowski coils have been installed in [[TJ-II:Sectors\|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 [[TJ-II:Vacuum system\|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:Shot database\|TJ-II database]] provide the corresponding measurements of the net plasma current.		The signals 'Ip_a5_' and 'Ip_b4_' in the [[TJ-II:Shot database\|TJ-II database]] provide the corresponding measurements of the net plasma current (in kA).

	== Diamagnetic loops ==		== Diamagnetic loops ==

Admin: /* Diamagnetic loops */

2022-04-19T07:47:25Z

Diamagnetic loops

← Older revision		Revision as of 09:47, 19 April 2022
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	measures only the vacuum magnetic flux.		measures only the vacuum magnetic flux.

	The signals 'W_a5_corr_' and 'W_b4_corr_' in the [[TJ-II:Shot database\|TJ-II database]] return the energy content of the plasma, based on the diamagnetic loop in [[TJ-II:Sectors\|sectors]] A5 and B4, corrected for the net plasma current.		The signals 'W_a5_corr_' and 'W_b4_corr_' in the [[TJ-II:Shot database\|TJ-II database]] return the energy content of the plasma (in kJ), based on the diamagnetic loop in [[TJ-II:Sectors\|sectors]] A5 and B4, corrected for the net plasma current.

	== References ==		== References ==
	<references />		<references />

Admin: /* Mirnov coils */

2018-09-19T13:11:17Z

Mirnov coils

← Older revision		Revision as of 15:11, 19 September 2018
Line 11:		Line 11:
	* One straight array in [[TJ-II:Sectors\|sector]] C4, at ''φ'' = 308°.		* One straight array in [[TJ-II:Sectors\|sector]] C4, at ''φ'' = 308°.
	* 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. This array has been enhanced by 10 additional coils (5 at each end).		* 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. This array has been enhanced by 10 additional coils (5 at each end).
			* Two toroidal arrays (installed 2018)

	== Rogowski coils ==		== Rogowski coils ==

Admin at 13:10, 19 September 2018

2018-09-19T13:10:32Z

← Older revision		Revision as of 15:10, 19 September 2018
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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-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>E. Ascasíbar et al, ''Energy content and magnetic configuration scan in TJ-II plasmas'', [http://www-fusion.ciemat.es/SW2005/conferences/madison99/Papers/Ascsibar.pdf 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>R. Jiménez-Gómez et al., ''Analysis of Magnetohydrodynamic Instabilities in TJ-II Plasmas'', [http://www.new.ans.org/pubs/journals/fst/a_1283 Fusion Science and Technology '''51''', 20 (2007)]</ref>
			<ref>R. Jiménez-Gómez, A. Könies, E. Ascasíbar, F. Castejón, T. Estrada, L. G. Eliseev, A. V. Melnikov, J.A. Jiménez, D. G. Pretty, D. Jiménez-Rey, M.A. Pedrosa, A. de Bustos and S. Yamamoto, ''Alfvén eigenmodes measured in the TJ-II stellarator'', [[doi:10.1088/0029-5515/51/3/033001\|Nucl. Fusion '''51''', 3 (2011) 033001]]</ref>
	There are 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'', ''φ'', and ''Z'') of the magnetic field.		There are 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'', ''φ'', and ''Z'') of the magnetic field.
	* One straight array in [[TJ-II:Sectors\|sector]] B5, at ''φ'' = 232°. The corresponding signals in the [[TJ-II:Shot database\|TJ-II database]] are called 'MIB5xy', where 'x' is 'R', 'F' (φ), or 'Z', and 'y' is the coil number.		* One straight array in [[TJ-II:Sectors\|sector]] B5, at ''φ'' = 232°. The corresponding signals in the [[TJ-II:Shot database\|TJ-II database]] are called 'MIB5xy', where 'x' is 'R', 'F' (φ), or 'Z', and 'y' is the coil number.

Admin: /* Mirnov coils */

2018-09-19T13:06:34Z

Mirnov coils

← Older revision		Revision as of 15:06, 19 September 2018
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	== Mirnov coils ==		== Mirnov coils ==

	[[File:~~TJ-II_Poloidal_Mirnov~~.png\|~~300px~~\|thumb\|right\|The poloidal array of Mirnov coils at TJ-II]]		[[File:Mirnov_coils.png\|600px\|thumb\|right\|The poloidal array of Mirnov coils at TJ-II]]

	[[TJ-II]] is fitted with an ample set of Mirnov coils:		[[TJ-II]] is fitted with an ample set of Mirnov coils:

Admin: /* Diamagnetic loops */

2018-08-21T09:29:57Z

Diamagnetic loops

← Older revision		Revision as of 11:29, 21 August 2018
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	== Diamagnetic loops ==		== Diamagnetic loops ==

	[[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 of [[TJ-II:Sectors\|sector]] B4]]

	Two internal diamagnetic loops are installed in [[TJ-II:Sectors\|sector]] A5 (135°) and B4 (225°).		Two internal diamagnetic loops are installed in [[TJ-II:Sectors\|sector]] A5 (135°) and B4 (225°).

Admin: /* Diamagnetic loops */

2012-07-25T07:41:38Z

Diamagnetic loops

← Older revision		Revision as of 09:41, 25 July 2012
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	measures only the vacuum magnetic flux.		measures only the vacuum magnetic flux.

	The signals '~~W_a5_corr~~' and '~~W_b4_corr~~' in the [[TJ-II:Shot database\|TJ-II database]] return the energy content of the plasma, based on the diamagnetic loop in [[TJ-II:Sectors\|sectors]] A5 and B4, corrected for the net plasma current.		The signals 'W_a5_corr_' and 'W_b4_corr_' in the [[TJ-II:Shot database\|TJ-II database]] return the energy content of the plasma, based on the diamagnetic loop in [[TJ-II:Sectors\|sectors]] A5 and B4, corrected for the net plasma current.

	== References ==		== References ==
	<references />		<references />

Admin: /* Mirnov coils */

2011-01-25T09:37:50Z

Mirnov coils

← Older revision		Revision as of 11:37, 25 January 2011
Line 9:		Line 9:
	* One straight array in [[TJ-II:Sectors\|sector]] B5, at ''φ'' = 232°. The corresponding signals in the [[TJ-II:Shot database\|TJ-II database]] are called 'MIB5xy', where 'x' is 'R', 'F' (φ), or 'Z', and 'y' is the coil number.		* One straight array in [[TJ-II:Sectors\|sector]] B5, at ''φ'' = 232°. The corresponding signals in the [[TJ-II:Shot database\|TJ-II database]] are called 'MIB5xy', where 'x' is 'R', 'F' (φ), or 'Z', and 'y' is the coil number.
	* One straight array in [[TJ-II:Sectors\|sector]] C4, at ''φ'' = 308°.		* One straight array in [[TJ-II:Sectors\|sector]] C4, at ''φ'' = 308°.
	* 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.		* 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. This array has been enhanced by 10 additional coils (5 at each end).

	== Rogowski coils ==		== Rogowski coils ==

Admin at 15:04, 5 November 2009

2009-11-05T15:04:22Z

← Older revision		Revision as of 17:04, 5 November 2009
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	[[File:TJ-II_Poloidal_Mirnov.png\|300px\|thumb\|right\|The poloidal array of Mirnov coils at TJ-II]]		[[File:TJ-II_Poloidal_Mirnov.png\|300px\|thumb\|right\|The poloidal array of Mirnov coils at TJ-II]]

	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-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>