TJ-II:Reflectometry - Revision history

Admin: Updated and corrected references

2015-05-18T06:56:44Z

Updated and corrected references

← Older revision		Revision as of 08:56, 18 May 2015
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	== Profile Reflectometer ==		== Profile Reflectometer ==

	[[File:Reflectometry density profile.png\|300px\|thumb\|right\|Time evolution of density profiles measured by the AM reflectometer during the transition to an enhanced confinement mode (from: Estrada et al., Plasma Phys. Control. Fusion '''43''' (2001) ~~1535~~)]]		[[File:Reflectometry density profile.png\|300px\|thumb\|right\|Time evolution of density profiles measured by the AM reflectometer during the transition to an enhanced confinement mode (from: <ref name="Estrada">T. Estrada et al., [[doi:10.1088/0741-3335/43/11/308\|Plasma Phys. Control. Fusion '''43''' (2001) 1535–1545]]</ref>)]]

	[[TJ-II]] has an AM reflectometer		[[TJ-II]] has an AM reflectometer<ref name="Estrada"></ref>
	<ref>~~[http://dx.doi.org/10.1088/0741-3335/43/11/308 T. Estrada et al., Plasma Phys. Control. Fusion '''43''' (2001) 1535–1545]~~</ref>
	for measuring electron density profiles with a temporal resolution of 2 ms.		for measuring electron density profiles with a temporal resolution of 2 ms.
	Separate antennas are used for launching and receiving the signal. The antennas are located in the equatorial plane of the toroidal cross-section at φ = 135° (between [[TJ-II:Sectors\|sectors]] A4 and A5), and view the plasma from the low-field side.		Separate antennas are used for launching and receiving the signal. The antennas are located in the equatorial plane of the toroidal cross-section at φ = 135° (between [[TJ-II:Sectors\|sectors]] A4 and A5), and view the plasma from the low-field side.
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	A fast frequency hopping reflectometer		A fast frequency hopping reflectometer
	<ref>~~[http://link.aip.org/link/?RSINAK/75/3865/1~~ L. Cupido, J. Sánchez and T. Estrada, Rev. Sci. Intrum. '''75''' (2004) 3865]</ref>		<ref>L. Cupido, J. Sánchez and T. Estrada, [[doi:10.1063/1.1788834\|Rev. Sci. Intrum. '''75''' (2004) 3865]]</ref>
	working in the Q-band (33 - 50 GHz) was used from 2004 - 2008 in [[TJ-II:Sectors\|sector]] B8 in perpendicular incidence (''conventional'' reflectometry). The system allowed studies of the velocity shear layer in [[TJ-II]]		working in the Q-band (33 - 50 GHz) was used from 2004 - 2008 in [[TJ-II:Sectors\|sector]] B8 in perpendicular incidence (''conventional'' reflectometry). The system allowed studies of the velocity shear layer in [[TJ-II]]
	<ref>~~[http://dx.doi.org/10.1088/0029-5515/46/9/S14~~ T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, Nucl. Fusion '''46''' (2006) S792–S798]</ref>		<ref>T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, [[doi:10.1088/0029-5515/46/9/S14\|Nucl. Fusion '''46''' (2006) S792–S798]]</ref>
	and of the radial position of its origin.		and of the radial position of its origin.
	<ref>~~[http://dx.doi.org/10.1209/0295-5075/84/65001~~ T. Happel, T. Estrada and C. Hidalgo, ''First experimental observation of a two-step process in the development of the edge velocity shear layer in a fusion plasma'', EPL 84 (2008) 65001]</ref>		<ref>T. Happel, T. Estrada and C. Hidalgo, ''First experimental observation of a two-step process in the development of the edge velocity shear layer in a fusion plasma'', [[doi:10.1209/0295-5075/84/65001\|EPL 84 (2008) 65001]]</ref>


	== Doppler Reflectometer ==		== Doppler Reflectometer ==
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	[[File:DRscheme.jpg\|200px\|thumb\|right\|Schematic drawing of the Doppler Reflectometer System of [[TJ-II]]. The rays are calculated using the 3D ray/beam-tracing code [[TRUBA]].]]		[[File:DRscheme.jpg\|200px\|thumb\|right\|Schematic drawing of the Doppler Reflectometer System of [[TJ-II]]. The rays are calculated using the 3D ray/beam-tracing code [[TRUBA]].]]
	Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6, φ = 337°)		Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6, φ = 337°)
	<ref>~~[http://link.aip.org/link/?RSINAK/80/073502/1~~ T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>		<ref>T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, [[doi:10.1063/1.3160106\|Rev. Sci. Instrum. '''80''' (2009) 073502]]</ref>
	, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.		, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.

	The system consists of a circular choked-corrugated antenna		The system consists of a circular choked-corrugated antenna
	<ref>~~[http://ieeexplore.ieee.org/search/wrapper.jsp?arnumber=1696015~~ J. Teniente, R. Gonzalo, and C. del-Rio, IEEE Antennas Wireless Propag. Lett. '''5''' (2006) 380]</ref>		<ref>J. Teniente, R. Gonzalo, and C. del-Rio, [[doi:10.1109/LAWP.2006.881919 \|IEEE Antennas Wireless Propag. Lett. '''5''' (2006) 380]]</ref>
	(fabricated by the [http://antenas.unavarra.es/ ''Antenna Group of the Public University of Navarra, Spain'']) which emits a microwave beam with a gaussian electric field distribution. The beam is reflected by a steerable ellipsoidal mirror to the plasma. The mirror serves for two purposes: 1) focus the microwave beam (obtaining plane wavefronts) to the region where backscattering takes place and 2) change the angle of incidence between beam and plasma, giving the possibility to select the turbulence scale to be measured.		(fabricated by the [http://antenas.unavarra.es/ ''Antenna Group of the Public University of Navarra, Spain'']) which emits a microwave beam with a gaussian electric field distribution. The beam is reflected by a steerable ellipsoidal mirror to the plasma. The mirror serves for two purposes: 1) focus the microwave beam (obtaining plane wavefronts) to the region where backscattering takes place and 2) change the angle of incidence between beam and plasma, giving the possibility to select the turbulence scale to be measured.

Admin: /* Doppler Reflectometer */ Added toroidal angle

2015-05-18T06:48:44Z

Doppler Reflectometer: Added toroidal angle

← Older revision		Revision as of 08:48, 18 May 2015
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	[[File:DRscheme.jpg\|200px\|thumb\|right\|Schematic drawing of the Doppler Reflectometer System of [[TJ-II]]. The rays are calculated using the 3D ray/beam-tracing code [[TRUBA]].]]		[[File:DRscheme.jpg\|200px\|thumb\|right\|Schematic drawing of the Doppler Reflectometer System of [[TJ-II]]. The rays are calculated using the 3D ray/beam-tracing code [[TRUBA]].]]
	Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)		Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6, φ = 337°)
	<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>		<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>
	, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.		, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.

Admin: Reverted edits by 95.128.245.186 (Talk) to last revision by Admin

2011-07-16T09:56:19Z

Reverted edits by 95.128.245.186 (Talk) to last revision by Admin

← Older revision		Revision as of 11:56, 16 July 2011
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	Different scenarios can be realized: Positive or negative incidence angles of the incident beam or perpendicular incidence, which is equivalent to a conventional reflectometer system. The [[Effective_plasma_radius\|radial]] position of scattering and the probed perpendicular wavenumber are calculated after the discharge using the 3D ray/beam-tracing code [[TRUBA]].		Different scenarios can be realized: Positive or negative incidence angles of the incident beam or perpendicular incidence, which is equivalent to a conventional reflectometer system. The [[Effective_plasma_radius\|radial]] position of scattering and the probed perpendicular wavenumber are calculated after the discharge using the 3D ray/beam-tracing code [[TRUBA]].

	~~Way to go on this essay, helepd a ton.~~		==References==
			<references />

95.128.245.186: /* References */

2011-07-16T00:56:20Z

References

← Older revision		Revision as of 02:56, 16 July 2011
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	Different scenarios can be realized: Positive or negative incidence angles of the incident beam or perpendicular incidence, which is equivalent to a conventional reflectometer system. The [[Effective_plasma_radius\|radial]] position of scattering and the probed perpendicular wavenumber are calculated after the discharge using the 3D ray/beam-tracing code [[TRUBA]].		Different scenarios can be realized: Positive or negative incidence angles of the incident beam or perpendicular incidence, which is equivalent to a conventional reflectometer system. The [[Effective_plasma_radius\|radial]] position of scattering and the probed perpendicular wavenumber are calculated after the discharge using the 3D ray/beam-tracing code [[TRUBA]].

	~~==References==~~		Way to go on this essay, helepd a ton.
	~~<references />~~

Admin at 11:13, 24 February 2011

2011-02-24T11:13:57Z

← Older revision		Revision as of 13:13, 24 February 2011
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	<ref>[http://dx.doi.org/10.1088/0029-5515/46/9/S14 T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, Nucl. Fusion '''46''' (2006) S792–S798]</ref>		<ref>[http://dx.doi.org/10.1088/0029-5515/46/9/S14 T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, Nucl. Fusion '''46''' (2006) S792–S798]</ref>
	and of the radial position of its origin.		and of the radial position of its origin.
	<ref>[http://dx.doi.org/10.1209/0295-5075/84/65001 T. Happel, T. Estrada, and C. Hidalgo, ~~Europhys. Lett.~~ '''84~~'''~~ (2008) 65001]</ref>		<ref>[http://dx.doi.org/10.1209/0295-5075/84/65001 T. Happel, T. Estrada and C. Hidalgo, ''First experimental observation of a two-step process in the development of the edge velocity shear layer in a fusion plasma'', EPL 84 (2008) 65001]</ref>


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	Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)		Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)
	<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>		<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>
	<ref>[http://dx.doi.org/10.1209/0295-5075/84/65001 T. Happel, T. Estrada and C. Hidalgo, ''First experimental observation of a two-step process in the development of the edge velocity shear layer in a fusion plasma'', EPL 84 (2008) 65001]</ref>
	, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.		, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.

Admin: /* Doppler Reflectometer */

2011-02-24T11:02:24Z

Doppler Reflectometer

← Older revision		Revision as of 13:02, 24 February 2011
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	Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)		Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)
	<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>		<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>
			<ref>[http://dx.doi.org/10.1209/0295-5075/84/65001 T. Happel, T. Estrada and C. Hidalgo, ''First experimental observation of a two-step process in the development of the edge velocity shear layer in a fusion plasma'', EPL 84 (2008) 65001]</ref>
	, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.		, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.

Admin: /* Profile Reflectometer */

2010-08-19T08:49:20Z

Profile Reflectometer

← Older revision		Revision as of 10:49, 19 August 2010
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	Separate antennas are used for launching and receiving the signal. The antennas are located in the equatorial plane of the toroidal cross-section at φ = 135° (between [[TJ-II:Sectors\|sectors]] A4 and A5), and view the plasma from the low-field side.		Separate antennas are used for launching and receiving the signal. The antennas are located in the equatorial plane of the toroidal cross-section at φ = 135° (between [[TJ-II:Sectors\|sectors]] A4 and A5), and view the plasma from the low-field side.
	Inside the [[TJ-II:Vacuum system\|vacuum vessel]], a fundamental wave-guide is used to transmit the signal from the closest port ([[TJ-II:Ports\|A4top]]: φ = 128.17°, θ = 90°) to the desired launching location (φ = 135°, θ = 180°).		Inside the [[TJ-II:Vacuum system\|vacuum vessel]], a fundamental wave-guide is used to transmit the signal from the closest port ([[TJ-II:Ports\|A4top]]: φ = 128.17°, θ = 90°) to the desired launching location (φ = 135°, θ = 180°).

			Signal names in the [[TJ-II:Shot_database\|TJ-II database]]:
			quadrature signals: 'SinAM', 'CosAM'; frequency ramp: 'Rampa'.

	== Fluctuation Reflectometer ==		== Fluctuation Reflectometer ==

Admin at 13:10, 10 November 2009

2009-11-10T13:10:03Z

← Older revision		Revision as of 15:10, 10 November 2009
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	for measuring electron density profiles with a temporal resolution of 2 ms.		for measuring electron density profiles with a temporal resolution of 2 ms.
	Separate antennas are used for launching and receiving the signal. The antennas are located in the equatorial plane of the toroidal cross-section at φ = 135° (between [[TJ-II:Sectors\|sectors]] A4 and A5), and view the plasma from the low-field side.		Separate antennas are used for launching and receiving the signal. The antennas are located in the equatorial plane of the toroidal cross-section at φ = 135° (between [[TJ-II:Sectors\|sectors]] A4 and A5), and view the plasma from the low-field side.
	Inside the [[TJ-II:Vacuum system\|vacuum vessel]], a fundamental wave-guide is used to transmit the signal from the closest port (A4top: φ = 128.17°, θ = 90°) to the desired launching location (φ = 135°, θ = 180°).		Inside the [[TJ-II:Vacuum system\|vacuum vessel]], a fundamental wave-guide is used to transmit the signal from the closest port ([[TJ-II:Ports\|A4top]]: φ = 128.17°, θ = 90°) to the desired launching location (φ = 135°, θ = 180°).

	== Fluctuation Reflectometer ==		== Fluctuation Reflectometer ==

Tim at 11:27, 10 November 2009

2009-11-10T11:27:19Z

← Older revision		Revision as of 13:27, 10 November 2009
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	The system consists of a circular choked-corrugated antenna		The system consists of a circular choked-corrugated antenna
	<ref>[http://ieeexplore.ieee.org/search/wrapper.jsp?arnumber=1696015 J. Teniente, R. Gonzalo, and C. del-Rio, IEEE Antennas Wireless Propag. Lett. '''5''' (2006) 380]</ref>		<ref>[http://ieeexplore.ieee.org/search/wrapper.jsp?arnumber=1696015 J. Teniente, R. Gonzalo, and C. del-Rio, IEEE Antennas Wireless Propag. Lett. '''5''' (2006) 380]</ref>
	(fabricated by the [http://antenas.unavarra.es/ ''Antenna Group of the Public University of Navarra, Spain'']) which emits a microwave beam with a gaussian electric field distribution. The beam is reflected by a steerable ellipsoidal mirror to the plasma. The mirror serves for two purposes: 1) focus the microwave beam to the region where backscattering takes place and 2) change the angle of incidence between beam and plasma, giving the possibility to select the turbulence scale to be measured. The [[Effective_plasma_radius\|radial]] position of scattering and the probed perpendicular wavenumber are calculated after the discharge using the 3D ray/beam-tracing code [[TRUBA]].		(fabricated by the [http://antenas.unavarra.es/ ''Antenna Group of the Public University of Navarra, Spain'']) which emits a microwave beam with a gaussian electric field distribution. The beam is reflected by a steerable ellipsoidal mirror to the plasma. The mirror serves for two purposes: 1) focus the microwave beam (obtaining plane wavefronts) to the region where backscattering takes place and 2) change the angle of incidence between beam and plasma, giving the possibility to select the turbulence scale to be measured.

			Different scenarios can be realized: Positive or negative incidence angles of the incident beam or perpendicular incidence, which is equivalent to a conventional reflectometer system. The [[Effective_plasma_radius\|radial]] position of scattering and the probed perpendicular wavenumber are calculated after the discharge using the 3D ray/beam-tracing code [[TRUBA]].

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

Tim at 11:13, 10 November 2009

2009-11-10T11:13:36Z

← Older revision		Revision as of 13:13, 10 November 2009
Line 24:		Line 24:
	Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)		Since February 2009, the frequency hopping system is in operation in oblique incidence (''Doppler'' reflectometry, [[TJ-II:Sectors\|sector]] C6)
	<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>		<ref>[http://link.aip.org/link/?RSINAK/80/073502/1 T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. '''80''' (2009) 073502]</ref>
	, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between 3 and 15 cm<sup>-1</sup>.		, measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the [[effective plasma radius]]) and the perpendicular wavenumber can be selected between ''k''<sub>⊥</sub> = 3 and 15 cm<sup>-1</sup>.

	The system consists of a circular choked-corrugated antenna		The system consists of a circular choked-corrugated antenna