FusionWiki - User contributions [en]

Peeling-Ballooning Model

2013-10-03T21:58:21Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks. It predicts operational regimes where pedestal pressure and bootstrap current lead to peeling unstable or ballooning unstable modes
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>. The peeling-ballooning model is one possible mechanism for the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-Ballooning Model

2013-10-03T21:56:53Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks. It predicts the parameter space where pedestal pressure and bootstrap current lead to peeling unstable or ballooning unstable modes
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>. Therefore the peeling-ballooning model is one possible mechanism for the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-Ballooning Model

2013-05-17T00:02:12Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks. It predicts where combinations of pedestal pressure and bootstrap current lead to peeling unstable or ballooning unstable modes
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>. Therefore the peeling-ballooning model is one possible mechanism for the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-Ballooning Model

2013-05-17T00:01:26Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks. It predicts where combinations of pedestal pressure and bootstrap current lead to peeling unstable or ballooning unstable modes
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>. The peeling-ballooning model is one possible mechanism for the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-Ballooning Model

2013-05-17T00:00:47Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks. It predicts where combinations of pedestal pressure and bootstrap current lead to peeling unstable or ballooning unstable modes
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>. The peeling-ballooning model is one possible explanation for the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-Ballooning Model

2013-05-17T00:00:01Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks. It predicts where combinations of pedestal pressure and bootstrap current lead to peeling unstable or ballooning unstable modes
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>. As such, the peeling-ballooning model is one possible explanation for the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-ballooning modes

2013-05-16T23:46:21Z

TFN: Redirected page to Peeling-Ballooning Model

#REDIRECT [[Peeling-Ballooning Model]]

Peeling-Ballooning Model

2013-05-16T23:45:53Z

TFN:

The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks, where plasma can go either peeling unstable or ballooning unstable
<ref>
[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]
</ref>
<ref>
[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]
</ref>.
It is one candidate mechanism underlying the formation of [[Edge Localized Modes]].

==References==
<references/>

Peeling-Ballooning Model

2013-05-16T23:38:27Z

TFN: Created page with 'The Peeling-Ballooning Model is a description of MHD stability in the edge region of tokamaks, where plasma can go either peeling unstable or ballooning unstable <ref> [http://l…'

Peeling Ballooning Model

2013-05-16T23:38:18Z

TFN: Redirected page to Peeling-Ballooning Model

#Redirect [[Peeling-Ballooning Model]]

Peeling-ballooning modes

2013-05-16T23:29:18Z

TFN: Redirected page to Peeling Ballooning Model

#REDIRECT [[Peeling Ballooning Model]]

Peeling-ballooning modes

2013-05-16T23:28:59Z

TFN: Redirected page to Peeling-Ballooning Model

#REDIRECT [[Peeling-Ballooning Model]]

Peeling-ballooning modes

2013-05-16T23:28:21Z

TFN: Replaced content with '#REDIRECTS Peeling-Ballooning Model'

#REDIRECTS [[Peeling-Ballooning Model]]

Peeling Ballooning Model

2013-05-16T23:27:21Z

Peeling-ballooning modes

2013-05-16T20:59:29Z

TFN:

Peeling-ballooning modes

2013-05-16T20:40:52Z

TFN: Created page with 'The Peeling-Ballooning Model is a description of MHD stability in the edge region in tokamaks.'

The Peeling-Ballooning Model is a description of MHD stability in the edge region in tokamaks.

Edge Localized Modes

2013-05-16T19:38:48Z

TFN: /* Physical mechanism */

The steep edge gradients (of density and temperature) associated with an [[H-mode]] lead to quasi-periodic violent relaxation phenomena, known as Edge Localized Modes (ELMs), which have a strong impact on the surrounding vessel.
<ref>[http://dx.doi.org/10.1088/0741-3335/38/2/001 H. Zohm, ''Edge localized modes (ELMs)'', Plasma Phys. Control. Fusion '''38''' (1996) 105-128]</ref>
<ref>[http://dx.doi.org/10.1016/S0022-3115(97)80039-6 D.N. Hill, ''A review of ELMs in divertor tokamaks'', Journal of Nuclear Materials '''241-243''' (1997) 182-198]</ref>

== Physical mechanism ==

The physical mechanism of ELMs has not been fully clarified. Several possible explanations have been put forward:
* Nonlinear interchange modes <ref>[http://dx.doi.org/10.1088/0741-3335/38/8/046 A. Takayama and M. Wakatani, ''ELM modelling based on the nonlinear interchange mode in edge plasma'', Plasma Phys. Control. Fusion '''38''' (1996) 1411-1414]</ref>
* Coupled [[peeling-ballooning modes]] <ref>[http://link.aip.org/link/?PHPAEN/5/2687/1 J.W. Connor et al, ''Magnetohydrodynamic stability of tokamak edge plasmas'', Phys. Plasmas '''5''' (1998) 2687]</ref><ref>[http://link.aip.org/link/?PHPAEN/9/2037/1 P.B. Snyder et al, ''Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes'', Phys. Plasmas '''9''' (2002) 2037]</ref><ref>[http://dx.doi.org/10.1088/0741-3335/46/8/003 J.-S. Lönnroth et al, ''Predictive transport modelling of type I ELMy H-mode dynamics using a theory-motivated combined ballooning–peeling model'', Plasma Phys. Control. Fusion '''46''' (2004) 1197-1215]</ref><ref>[http://dx.doi.org/10.1088/0029-5515/49/9/095015 N. Hayashi et al, ''Integrated simulation of ELM energy loss and cycle in improved H-mode plasmas'', Nucl. Fusion '''49''' (2009) 095015]</ref>
* Peeling modes <ref>[http://link.aip.org/link/?APCPCS/871/87/1 C.G. Gimblett, ''Peeling mode relaxation ELM model'', AIP Conf. Proc. '''871''' (2006) 87-99]</ref>
* Flux surface peeling <ref>[http://dx.doi.org/10.1016/j.jnucmat.2004.09.067 E.R. Solano et al, ''ELMs and strike point jumps'', Journal of Nuclear Materials '''337-339''' (2005) 747-750 ]</ref>
* [[Criticality of MHD equilibrium]] <ref> [http://dx.doi.org/10.1088/0741-3335/46/3/L02 Emilia R. Solano, ''Criticality of the Grad–Shafranov equation: transport barriers and fragile equilibria'', Plasma Phys. Control. Fusion '''46''' (2004) L7-L13] </ref>
* [[Self-Organised Criticality]] <ref>[http://dx.doi.org/10.1088/0029-5515/43/10/003 R. Sánchez et al, ''Modelling of ELM-like phenomena via mixed SOC-diffusive dynamics'', Nucl. Fusion '''43''' (2003) 1031-1039 ]</ref>

== ELMs and machine operation ==

The occurrence of an ELM leads to a significant expulsion of heat and particles, with deleterious consequences for the vessel wall and machine operation.
Although [[Quiescent H-mode]]s exist (without ELMs),
<ref>[http://link.aip.org/link/?PHPAEN/12/056121/1 K.H. Burrell et al, ''Advances in understanding quiescent H-mode plasmas in DIII-D'', Phys. Plasmas '''12''' (2005) 056121]</ref>
they are generally considered not convenient due to the accumulation of impurities.
To achieve steady state, an ELMy H-mode is preferred and this mode of operation is proposed as the standard operating scenario for [[ITER]], thus converting ELM mitigation into a priority.
<ref>[http://dx.doi.org/10.1016/j.fusengdes.2009.01.063 M.R. Wade, ''Physics and engineering issues associated with edge localized mode control in ITER'', Fusion Engineering and Design '''84''', Issues 2-6 (2009) 178-185]</ref>

== See also ==
* [[Resonant Magnetic Perturbation]], an ELM mitigation technique

== References ==
<references />