Internal Transport Barrier: Difference between revisions
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No generally accepted definition for Internal Transport Barriers (ITBs) exists. Vaguely speaking, a radially localized reduction of transport is meant. | No generally accepted definition for Internal Transport Barriers (ITBs) exists. Vaguely speaking, a radially localized reduction of transport is meant. | ||
Factors contributing to the creation of | |||
== 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, possibly associated with rational magnetic surfaces. | |||
Factors contributing to the creation of ITBs include: | |||
<ref>[http://dx.doi.org/10.1088/0029-5515/44/4/R01 J.W. Connor et al, ''A review of internal transport barrier physics for steady-state operation of tokamaks'', Nucl. Fusion '''44''' (2004) R1-R49]</ref> | <ref>[http://dx.doi.org/10.1088/0029-5515/44/4/R01 J.W. Connor et al, ''A review of internal transport barrier physics for steady-state operation of tokamaks'', Nucl. Fusion '''44''' (2004) R1-R49]</ref> | ||
* Power deposited inside the magnetic surface, and/or pressure gradients | * Power deposited inside the magnetic surface, and/or pressure gradients | ||
| Line 6: | Line 12: | ||
* MHD activity | * MHD activity | ||
* Momentum torques | * Momentum torques | ||
== References == | == References == | ||
<references /> | <references /> | ||
Revision as of 12:22, 27 August 2009
No generally accepted definition for Internal Transport Barriers (ITBs) exists. Vaguely speaking, a radially localized reduction of transport is meant.
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, possibly associated with rational magnetic surfaces.
Factors contributing to the creation of ITBs include: [1]
- Power deposited inside the magnetic surface, and/or pressure gradients
- Magnetic shear and the shape of the profile of the rotational transform
- MHD activity
- Momentum torques