TJ-II:Magnetic configuration - Revision history

Admin: /* Flexibility */

2026-10-07T14:30:02Z

Flexibility

← Older revision		Revision as of 16:30, 7 October 2026
Line 381:		Line 381:
	TJ-II has considerable configurational flexibility, as observed in the 'flexibility diagram'<ref>E. Ascasíbar, T. Estrada, F. Castejón, A. López-Fraguas, I. Pastor, J. Sánchez, U. Stroth, J. Qin and TJ-II Team, ''Magnetic configuration and plasma parameter dependence of the energy confinement time in ECR heated plasmas from the TJ-II stellarator'', [[doi:10.1088/0029-5515/45/4/009\|Nucl. Fusion '''45''' (2005) 276–284]]</ref>.		TJ-II has considerable configurational flexibility, as observed in the 'flexibility diagram'<ref>E. Ascasíbar, T. Estrada, F. Castejón, A. López-Fraguas, I. Pastor, J. Sánchez, U. Stroth, J. Qin and TJ-II Team, ''Magnetic configuration and plasma parameter dependence of the energy confinement time in ECR heated plasmas from the TJ-II stellarator'', [[doi:10.1088/0029-5515/45/4/009\|Nucl. Fusion '''45''' (2005) 276–284]]</ref>.
	Some of this flexibility space has been explored, as in the 'magnetic well scan' experiments<ref>A. de Aguilera, F. Castejón, E. Ascasíbar, et al. ''Magnetic well scan and confinement in the TJ-II stellarator'', [[doi:10.1088/0029-5515/55/11/113014\|Nucl. Fusion, 55(11):113014, 2015]]</ref>.		Some of this flexibility space has been explored, as in the 'magnetic well scan' experiments<ref>A. de Aguilera, F. Castejón, E. Ascasíbar, et al. ''Magnetic well scan and confinement in the TJ-II stellarator'', [[doi:10.1088/0029-5515/55/11/113014\|Nucl. Fusion, 55(11):113014, 2015]]</ref>.
			More recently, the rotational transform was found to be of importance for L-H confinement transitions<ref>B. P. van Milligen, T. Estrada, B. Carreras, L. García, and TJ-II Team. ''Importance of the rotational transform for L–H transitions in the TJ-II stellarator'', [[doi:10.3390/plasma7020024\|Plasma, 7(2):446–464, 2024]].</ref>.

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

Admin: /* Flexibility */

2026-10-07T14:27:31Z

Flexibility

← Older revision		Revision as of 16:27, 7 October 2026
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	[[File:Flexibility TJ-II.png\|300px\|thumb\|right\|Flexibility diagram of TJ-II magnetic configurations. Several lines of constant rotational transform are highlighted and labelled with the corresponding central <math>\iota/2\pi</math>-value.]]		[[File:Flexibility TJ-II.png\|300px\|thumb\|right\|Flexibility diagram of TJ-II magnetic configurations. Several lines of constant rotational transform are highlighted and labelled with the corresponding central <math>\iota/2\pi</math>-value.]]
	TJ-II has considerable configurational flexibility, as observed in the 'flexibility diagram'<ref>E. Ascasíbar, T. Estrada, F. Castejón, A. López-Fraguas, I. Pastor, J. Sánchez, U. Stroth, J. Qin and TJ-II Team, ''Magnetic configuration and plasma parameter dependence of the energy confinement time in ECR heated plasmas from the TJ-II stellarator'', [[doi:10.1088/0029-5515/45/4/009\|Nucl. Fusion '''45''' (2005) 276–284]]</ref>.		TJ-II has considerable configurational flexibility, as observed in the 'flexibility diagram'<ref>E. Ascasíbar, T. Estrada, F. Castejón, A. López-Fraguas, I. Pastor, J. Sánchez, U. Stroth, J. Qin and TJ-II Team, ''Magnetic configuration and plasma parameter dependence of the energy confinement time in ECR heated plasmas from the TJ-II stellarator'', [[doi:10.1088/0029-5515/45/4/009\|Nucl. Fusion '''45''' (2005) 276–284]]</ref>.
			Some of this flexibility space has been explored, as in the 'magnetic well scan' experiments<ref>A. de Aguilera, F. Castejón, E. Ascasíbar, et al. ''Magnetic well scan and confinement in the TJ-II stellarator'', [[doi:10.1088/0029-5515/55/11/113014\|Nucl. Fusion, 55(11):113014, 2015]]</ref>.

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

Admin at 14:06, 7 October 2026

2026-10-07T14:06:17Z

← Older revision		Revision as of 16:06, 7 October 2026
Line 4:		Line 4:
	* 'yy': 10 times the current (in kA) in the helical coil		* 'yy': 10 times the current (in kA) in the helical coil
	* 'zz': 10 times the current (in kA) in the vertical field coils		* 'zz': 10 times the current (in kA) in the vertical field coils
	The current in the toroidal field coils is not specified, as its value is adjusted to guarantee central absorption of the [[TJ-II:Electron Cyclotron Resonant Heating\|Electron Cyclotron Resonant Heating]] source (requiring a specific value of the magnetic field on the magnetic axis).		The current in the toroidal field coils is not specified, as its value is adjusted to guarantee central absorption of the [[TJ-II:Electron Cyclotron Resonant Heating\|Electron Cyclotron Resonant Heating]] source (requiring a specific 'resonant' value of the magnetic field on the magnetic axis, <math>B_{reson}</math>).

	Configuration list:		Configuration list:

Admin at 13:19, 7 October 2026

2026-10-07T13:19:23Z

Show changes

Admin at 12:47, 7 October 2026

2026-10-07T12:47:43Z

@@ Line 7: / Line 7: @@
 Often used configurations are:
-* 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</math>, V<sub>plasma</sub> = 1.098 m<sup>3</sup>)
+{| class="wikitable" border="1"
-* 100_48_65 (a = 0.191 m, <math>\iota_0/2\pi = 1.591</math>, V<sub>plasma</sub>= 1.09 m<sup>3</sup>)
+|-
 == Flexibility ==

Admin at 10:43, 7 October 2026

2026-10-07T10:43:39Z

← Older revision		Revision as of 12:43, 7 October 2026
Line 4:		Line 4:
	* 'yy': 10 times the current (in kA) in the helical coil		* 'yy': 10 times the current (in kA) in the helical coil
	* 'zz': 10 times the current (in kA) in the vertical field coils		* 'zz': 10 times the current (in kA) in the vertical field coils
	The toroidal field is not specified, as its value is adjusted to guarantee central absorption of the [[TJ-II:Electron Cyclotron Resonant Heating\|Electron Cyclotron Resonant Heating]] source.		The current in the toroidal field coils is not specified, as its value is adjusted to guarantee central absorption of the [[TJ-II:Electron Cyclotron Resonant Heating\|Electron Cyclotron Resonant Heating]] source (requiring a specific value of the magnetic field on the magnetic axis).

	Often used configurations are:		Often used configurations are:

Admin at 10:41, 7 October 2026

2026-10-07T10:41:35Z

← Older revision		Revision as of 12:41, 7 October 2026
Line 9:		Line 9:
	* 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</math>, V<sub>plasma</sub> = 1.098 m<sup>3</sup>)		* 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</math>, V<sub>plasma</sub> = 1.098 m<sup>3</sup>)
	* 100_48_65 (a = 0.191 m, <math>\iota_0/2\pi = 1.591</math>, V<sub>plasma</sub>= 1.09 m<sup>3</sup>)		* 100_48_65 (a = 0.191 m, <math>\iota_0/2\pi = 1.591</math>, V<sub>plasma</sub>= 1.09 m<sup>3</sup>)

			== Flexibility ==

			[[File:Flexibility TJ-II.png\|300px\|thumb\|right\|Flexibility diagram of TJ-II magnetic configurations. Several lines of constant rotational transform are highlighted and labelled with the corresponding central <math>\iota/2\pi</math>-value.]]
			TJ-II has considerable configurational flexibility, as observed in the 'flexibility diagram'<ref>E. Ascasíbar, T. Estrada, F. Castejón, A. López-Fraguas, I. Pastor, J. Sánchez, U. Stroth, J. Qin and TJ-II Team, ''Magnetic configuration and plasma parameter dependence of the energy confinement time in ECR heated plasmas from the TJ-II stellarator'', [[doi:10.1088/0029-5515/45/4/009\|Nucl. Fusion '''45''' (2005) 276–284]]</ref>.

			== References ==
			<references/>

Admin at 10:31, 7 October 2026

2026-10-07T10:31:47Z

← Older revision		Revision as of 12:31, 7 October 2026
Line 4:		Line 4:
	* 'yy': 10 times the current (in kA) in the helical coil		* 'yy': 10 times the current (in kA) in the helical coil
	* 'zz': 10 times the current (in kA) in the vertical field coils		* 'zz': 10 times the current (in kA) in the vertical field coils
			The toroidal field is not specified, as its value is adjusted to guarantee central absorption of the [[TJ-II:Electron Cyclotron Resonant Heating\|Electron Cyclotron Resonant Heating]] source.

	Often used configurations are:		Often used configurations are:
	* 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</math>, V<sub>plasma</sub> = 1.098 m<sup>3</sup>)		* 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</math>, V<sub>plasma</sub> = 1.098 m<sup>3</sup>)
	* 100_48_65 (a = 0.191 m, <math>\iota_0/2\pi = 1.591</math>, V<sub>plasma</sub>= 1.09 m<sup>3</sup>)		* 100_48_65 (a = 0.191 m, <math>\iota_0/2\pi = 1.591</math>, V<sub>plasma</sub>= 1.09 m<sup>3</sup>)

Admin: Created page with "The magnetic configuration of TJ-II in vacuum is completely determined by the currents flowing through the external coils. Magnetic configurations are labelled as 'xxx_yy_zz', where * 'xxx': 10 times the current (in kA) in the circular coil * 'yy': 10 times the current (in kA) in the helical coil * 'zz': 10 times the current (in kA) in the vertical field coils Often used configurations are: * 100_44_64 (a = 0.1925 m, $\iota_0/2\pi = 1.55$
2026-10-07T10:29:36Z

Created page with "The magnetic configuration of TJ-II in vacuum is completely determined by the currents flowing through the external coils. Magnetic configurations are labelled as 'xxx_yy_zz', where * 'xxx': 10 times the current (in kA) in the circular coil * 'yy': 10 times the current (in kA) in the helical coil * 'zz': 10 times the current (in kA) in the vertical field coils Often used configurations are: * 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</..."

New page
The magnetic configuration of [[TJ-II]] in vacuum is completely determined by the currents flowing through the [[TJ-II:Coil system|external coils]].
Magnetic configurations are labelled as 'xxx_yy_zz', where
* 'xxx': 10 times the current (in kA) in the circular coil
* 'yy': 10 times the current (in kA) in the helical coil
* 'zz': 10 times the current (in kA) in the vertical field coils

Often used configurations are:
* 100_44_64 (a = 0.1925 m, <math>\iota_0/2\pi = 1.55</math>, Vplasma = 1.098 m3)
* 100_48_65 (a = 0.191 m, <math>\iota_0/2\pi = 1.591</math>, Vplasma= 1.09 m3)