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Stellarator optimization: Difference between revisions
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In [[tokamak]]s, a significant part of the confining magnetic field is | In [[tokamak]]s, a significant part of the confining magnetic field is produced by the currents flowing in the plasma itself. | ||
In contrast, the confining magnetic field of [[stellarator]]s may be dominated by externally imposed magnetic fields (depending on the configuration). | In contrast, the confining magnetic field of [[stellarator]]s may be dominated by externally imposed magnetic fields (depending on the configuration). | ||
Since the confinement properties of toroidally confined devices depend sensitively on the magnetic field, the question arises whether this external control may be used to improve confinement properties, and thus facilitate the development of an economically attractive [[stellarator reactor]]. | Since the confinement properties of toroidally confined devices depend sensitively on the magnetic field, the question arises whether this external control may be used to improve confinement properties, and thus facilitate the development of an economically attractive [[stellarator reactor]]. | ||
Several optimization strategies have been developed and/or are being studied. | Several optimization strategies have been developed and/or are being studied. | ||
<ref> | <ref>H.E. Mynick, ''Transport optimization in stellarators'', [[doi:10.1063/1.2177643|Phys. Plasmas '''13''' (2006) 058102]]</ref> | ||
* Optimization of [[Neoclassical transport]]. See [[omnigeneity]] and [[quasisymmetry]]. | * Optimization of [[Neoclassical transport]].<ref>H. Wobig, ''The theoretical basis of a drift-optimized stellarator reactor'', [[doi:10.1088/0741-3335/35/8/001|Plasma Phys. Control. Fusion '''35''' (1993) 903]]</ref> See [[omnigeneity]] and [[quasisymmetry]]. | ||
* Optimization of [[Anomalous transport]]<ref> | * Optimization of [[Anomalous transport]].<ref>H.E. Mynick, N. Pomphrey, and P. Xanthopoulos, ''Optimizing Stellarators for Turbulent Transport'', [[doi:10.1103/PhysRevLett.105.095004|Phys. Rev. Lett. '''105''' (2010) 095004]]</ref> | ||
* | |||
== Optimized stellarators == | |||
* [[W7-X]] - Neoclassical optimization; operational | |||
* [http://www.hsx.wisc.edu/ HSX] - Quasihelical symmetry; operational | |||
* [http://web.utk.edu/~qps/ QPS] - Quasipoloidal symmetry; cancelled | |||
* [http://ncsx.pppl.gov/ NCSX] - Quasi-axisymmetry; cancelled | |||
Also see: [http://web.ornl.gov/sci/fed/stelnews/pdf/PoP_proposal.pdf US Stellarator proof-of-principle program] | |||
== References == | == References == | ||
<references /> | <references /> | ||