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Zonal flow generation in the improved confinement mode plasma and its role in confinement bifurcations

Shats, Michael; Solomon, W

Description

Unstable fluctuations develop in the initially quiescent plasma in the improved confinement mode of the H-1 heliac when the radial electric field (Er) shear exceeds some critical value. These unstable Er shear-driven modes are shown to generate zonal-flow-like poloidally symmetric potential structures, similar to those generated in the low confinement mode (Shats M G and Solomon W M 2002 Phys. Rev. Lett. 88 045001). The structures modulate their parent waves, the background Er shear and the...[Show more]; We discuss the interband light tunneling in a two-dimensional periodic photonic structure, as studied recently in experiments for optically induced photonic lattices [Trompeter et al., Phys. Rev. Lett. 96, 053903 (2006)]. We identify the Zener tunneling regime at the crossing of two Bloch bands, which occurs in the generic case of a Bragg reflection when the Bloch index crosses the edge of the irreducible Brillouin zone. Similarly, higher-order Zener tunneling involves four Bloch bands when the...[Show more]

dc.contributor.authorShats, Michael
dc.contributor.authorSolomon, W
dc.date.accessioned2009-05-06T05:15:58Z
dc.date.accessioned2010-12-20T06:03:53Z
dc.date.available2009-05-06T05:15:58Z
dc.date.available2010-12-20T06:03:53Z
dc.identifier.citationNew Journal of Physics 4 (2002): 30.1-30.14
dc.identifier.issn1367-2630
dc.identifier.urihttp://hdl.handle.net/10440/229
dc.identifier.urihttp://digitalcollections.anu.edu.au/handle/10440/229
dc.description.abstractUnstable fluctuations develop in the initially quiescent plasma in the improved confinement mode of the H-1 heliac when the radial electric field (Er) shear exceeds some critical value. These unstable Er shear-driven modes are shown to generate zonal-flow-like poloidally symmetric potential structures, similar to those generated in the low confinement mode (Shats M G and Solomon W M 2002 Phys. Rev. Lett. 88 045001). The structures modulate their parent waves, the background Er shear and the fluctuation-driven radial transport. The onset of zonal flows is observed as a precursor to the plasma confinement bifurcation to an even higher confinement regime.
dc.description.abstractWe discuss the interband light tunneling in a two-dimensional periodic photonic structure, as studied recently in experiments for optically induced photonic lattices [Trompeter et al., Phys. Rev. Lett. 96, 053903 (2006)]. We identify the Zener tunneling regime at the crossing of two Bloch bands, which occurs in the generic case of a Bragg reflection when the Bloch index crosses the edge of the irreducible Brillouin zone. Similarly, higher-order Zener tunneling involves four Bloch bands when the Bloch index passes through a high-symmetry point on the edge of the Brillouin zone. We derive simple analytical models that describe the tunneling effect, and calculate the corresponding tunneling probabilities.
dc.format19 pages
dc.publisherInstitute of Physics Publishing
dc.sourceNew Journal of Physics
dc.source.urihttp://www.iop.org/EJ/article/1367-2630/4/1/330/nj2130.pdf?request-id=4ccaaed2-10ea-43ca-ae08-d00802894a36
dc.source.urihttp://www.iop.org/EJ/article/1367-2630/4/1/330/nj2130.html
dc.titleZonal flow generation in the improved confinement mode plasma and its role in confinement bifurcations
dc.typeJournal article
local.description.refereedYes
local.identifier.citationvolume4
dc.date.issued2002-05-29
local.identifier.absfor020204
local.identifier.ariespublicationMigratedxPub2709
local.type.statusPublished Version
local.contributor.affiliationShats, Michael, Research School of Physical Sciences and Engineering, Plasma Research Laboratory
local.contributor.affiliationSolomon, W, Research School of Physical Sciences and Engineering, Plasma Research Laboratory
local.bibliographicCitation.startpage30.1
local.bibliographicCitation.lastpage30.14
local.identifier.doi10.1088/1367-2630/4/1/330
dc.date.updated2015-12-11T07:40:20Z
local.identifier.scopusID2-s2.0-3042558478
CollectionsANU Research Publications

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