Pedestal - Revision history

Admin: Updated reference links

2018-04-03T14:01:23Z

Updated reference links

← Older revision		Revision as of 16:01, 3 April 2018
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	[[File:H-mode.png\|300px\|thumb\|right\|Sketch of L- and H-mode profiles and pedestal.]]		[[File:H-mode.png\|300px\|thumb\|right\|Sketch of L- and H-mode profiles and pedestal.]]
	In the context of magnetic confinement fusion, the term ''pedestal'' refers to a global increase of a profile (such as the pressure), caused by the formation of a relatively narrow edge plasma region with significantly enhanced profile gradients, associated with an edge transport barrier, characteristic of the [[H-mode]].		In the context of magnetic confinement fusion, the term ''pedestal'' refers to a global increase of a profile (such as the pressure), caused by the formation of a relatively narrow edge plasma region with significantly enhanced profile gradients, associated with an edge transport barrier, characteristic of the [[H-mode]].
	<ref>[~~http~~:~~//dx.doi.org/~~10.1088/0029-5515/29/11/010 ~~ASDEX Team, ''The H-Mode of ASDEX'',~~ Nucl. Fusion '''29''' (1989) 1959]</ref>		<ref>ASDEX Team, ''The H-Mode of ASDEX'', [[doi:10.1088/0029-5515/29/11/010\|Nucl. Fusion '''29''' (1989) 1959]]</ref>
	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

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	As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.		As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.
	<ref>~~[http://dx.doi.org/10.1088/0741-3335/42/5A/302~~ A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>		<ref>A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', [[doi:10.1088/0741-3335/42/5A/302\|Plasma Phys. Control. Fusion '''42''' (2000) A15]]</ref>
	<ref>~~[http://link.aip.org/link/doi/10.1063/1.3593008~~ M.N.A. Beurskens et al, ''H-mode pedestal scaling in DIII-D, ASDEX Upgrade, and JET'', Phys. Plasmas '''18''' (2011) 056120]</ref>		<ref>M.N.A. Beurskens et al, ''H-mode pedestal scaling in DIII-D, ASDEX Upgrade, and JET'', [[doi:10.1063/1.\|Phys. Plasmas '''18''' (2011) 056120]]</ref>

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

Admin at 13:56, 9 July 2011

2011-07-09T13:56:20Z

← Older revision		Revision as of 15:56, 9 July 2011
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	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

	Physically, the edge region is complex as it is bounded by the [[Separatrix\|separatrix]] signalling the transition from the confined plasma with closed field lines to the ~~scrape~~-~~off layer~~ (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.		Physically, the edge region is complex as it is bounded by the [[Separatrix\|separatrix]] signalling the transition from the confined plasma with closed field lines to the [[Scrape-Off Layer]] (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.
	As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.		As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.

Admin at 13:44, 9 July 2011

2011-07-09T13:44:46Z

← Older revision		Revision as of 15:44, 9 July 2011
Line 4:		Line 4:
	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

	Physically, the edge region is complex as it is bounded by the [[Separatrix\|separatrix]]) signalling the transition from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.		Physically, the edge region is complex as it is bounded by the [[Separatrix\|separatrix]] signalling the transition from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.
	As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.		As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.

Admin at 13:43, 9 July 2011

2011-07-09T13:43:45Z

← Older revision		Revision as of 15:43, 9 July 2011
Line 4:		Line 4:
	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

	Physically, the edge region is complex as it ~~contains~~ the ~~transition (~~[[Separatrix\|separatrix]]) from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.		Physically, the edge region is complex as it is bounded by the [[Separatrix\|separatrix]]) signalling the transition from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.
	~~The~~ understanding of this region, and therefore of the pedestal, is still imperfect.		As a consequence, the understanding of this region, and therefore of the pedestal, is still imperfect.
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.
	<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>		<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>

Admin at 13:40, 9 July 2011

2011-07-09T13:40:12Z

← Older revision		Revision as of 15:40, 9 July 2011
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	[[File:H-mode.png\|300px\|thumb\|right\|Sketch of L- and H-mode profiles and pedestal.]]		[[File:H-mode.png\|300px\|thumb\|right\|Sketch of L- and H-mode profiles and pedestal.]]
	In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced ~~(pressure)~~ profile gradients, ~~identified~~ with an edge transport barrier, characteristic of the [[H-mode]].		In the context of magnetic confinement fusion, the term ''pedestal'' refers to a global increase of a profile (such as the pressure), caused by the formation of a relatively narrow edge plasma region with significantly enhanced profile gradients, associated with an edge transport barrier, characteristic of the [[H-mode]].
	<ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref>		<ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref>
	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

	Physically, the edge region is complex as it contains the transition ([[Separatrix\|separatrix]]) from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.		Physically, the edge region is complex as it contains the transition ([[Separatrix\|separatrix]]) from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.
	The understanding of this region is still imperfect.		The understanding of this region, and therefore of the pedestal, is still imperfect.
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.
	<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>		<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>

Admin at 13:36, 9 July 2011

2011-07-09T13:36:21Z

← Older revision		Revision as of 15:36, 9 July 2011
Line 1:		Line 1:
	In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]].		[[File:H-mode.png\|300px\|thumb\|right\|Sketch of L- and H-mode profiles and pedestal.]]
			In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced (pressure) profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]].
	<ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref>		<ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref>
	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

Admin at 10:26, 9 July 2011

2011-07-09T10:26:57Z

← Older revision		Revision as of 12:26, 9 July 2011
Line 7:		Line 7:
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.
	<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>		<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>
			<ref>[http://link.aip.org/link/doi/10.1063/1.3593008 M.N.A. Beurskens et al, ''H-mode pedestal scaling in DIII-D, ASDEX Upgrade, and JET'', Phys. Plasmas '''18''' (2011) 056120]</ref>

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

Admin at 10:21, 9 July 2011

2011-07-09T10:21:59Z

← Older revision		Revision as of 12:21, 9 July 2011
Line 1:		Line 1:
	In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]].		In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]].
			<ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref>
	When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.		When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency\|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

Admin at 10:05, 9 July 2011

2011-07-09T10:05:04Z

← Older revision		Revision as of 12:05, 9 July 2011
Line 5:		Line 5:
	The understanding of this region is still imperfect.		The understanding of this region is still imperfect.
	Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.		Many attempts have been made to derive [[Scaling law\|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.
			<ref>[http://dx.doi.org/10.1088/0741-3335/42/5A/302 A.E. Hubbard, ''Physics and scaling of the H-mode pedestal'', Plasma Phys. Control. Fusion '''42''' (2000) A15]</ref>

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

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In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]].
When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology.

Physically, the edge region is complex as it contains the transition ([[Separatrix|separatrix]]) from the confined plasma with closed field lines to the scrape-off layer (SOL) with open field lines; transport fluxes are large there; and the interaction with the wall (atomic and molecular physics) is important.
The understanding of this region is still imperfect.
Many attempts have been made to derive [[Scaling law|scaling laws]] of phenomenological pedestal parameters (such as its width and height), with limited success.

== References ==
<references />