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Internal Transport Barrier: Difference between revisions
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== Physical mechanism == | == Physical mechanism == | ||
The mechanism for the formation of Internal Transport Barriers in magnetically confined plasmas is complex and not fully understood. Probably, it is related to the mechanism for the formation of the [[H-mode]] barrier, involving turbulence suppression by sheared flows | The mechanism for the formation of Internal Transport Barriers in magnetically confined plasmas is complex and not fully understood. Probably, it is related to the mechanism for the formation of the [[H-mode]] barrier, involving turbulence suppression by sheared (''E'' × ''B'') flows. | ||
ITBs are often found to be associated with rational magnetic surfaces. | |||
Factors contributing to the formation of ITBs include: | Factors contributing to the formation of ITBs include: | ||
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* MHD activity | * MHD activity | ||
* Momentum torques (poloidal or toroidal) | * Momentum torques (poloidal or toroidal) | ||
* Reduced collisional damping <ref>[http://link.aip.org/link/?PHPAEN/14/020702/1 K. Itoh et al, ''Physics of internal transport barrier of toroidal helical plasmas'', Phys. Plasmas '''14''' (2007) 020702]</ref> | * Enhanced collisionless losses of trapped particles, generating a radial electric field <ref>[http://link.aps.org/doi/10.1103/PhysRevLett.86.5910 U. Stroth et al, ''Internal Transport Barrier Triggered by Neoclassical Transport in W7-AS'', Phys. Rev. Lett. '''86''' (2001) 5910 - 5913]</ref> | ||
* Reduced collisional damping, allowing the growth of zonal flows <ref>[http://link.aip.org/link/?PHPAEN/14/020702/1 K. Itoh et al, ''Physics of internal transport barrier of toroidal helical plasmas'', Phys. Plasmas '''14''' (2007) 020702]</ref> | |||
== References == | == References == | ||
<references /> | <references /> | ||