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Quasisymmetry: Difference between revisions
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Quasisymmetric (quasihelically symmetric) [[MHD equilibrium|plasma equilibria]] are non-[[axisymmetry|axisymmetric]] configurations in which the magnetic field strength depends only on one angular coordinate within the magnetic [[flux surface]]s. | Quasisymmetric (quasihelically symmetric) [[MHD equilibrium|plasma equilibria]] are non-[[axisymmetry|axisymmetric]] configurations in which the magnetic field strength depends only on one angular coordinate within the magnetic [[flux surface]]s. | ||
<ref> | <ref>D.A. Garren and A.H. Boozer, ''Existence of quasihelically symmetric stellarators'', [[doi:10.1063/1.859916|Phys. Fluids B 3 (1991) 2822]]</ref> | ||
This concept is part of the program of [[stellarator optimization]] (designing stellarators to have reduced transport, i.e., heat and particle losses). | This concept is part of the program of [[stellarator optimization]] (designing stellarators to have reduced transport, i.e., heat and particle losses). | ||
<ref>[[doi:10.1088/0741-3335/55/12/125014| | <ref>Iván Calvo et al, ''Stellarators close to quasisymmetry'', [[doi:10.1088/0741-3335/55/12/125014|Plasma Phys. Control. Fusion '''55''' (2013) 125014]]</ref> | ||
Types of quasisymmetry: | Types of quasisymmetry: | ||
* Quasihelical (QH) symmetry, on which the design of the [http://www.hsx.wisc.edu/ HSX stellarator] (operational) is based.<ref> | * Quasihelical (QH) symmetry, on which the design of the [http://www.hsx.wisc.edu/ HSX stellarator] (operational) is based.<ref>J.N. Talmadge, F.S.B. Anderson, D.T. Anderson, C. Deng, W. Guttenfelder, K.M. Likin, J. Lore, J.C. Schmitt, K. Zhai, ''Experimental Tests of Quasisymmetry in HSX'', [[doi:10.1585/pfr.3.S1002|Plasma and Fusion Research '''3''' (2008) S1002]]</ref> | ||
* Quasipoloidal (QP) symmetry, on which the design of the [http://web.utk.edu/~qps/ QPS stellarator] (under construction) is based.<ref> | * Quasipoloidal (QP) symmetry, on which the design of the [http://web.utk.edu/~qps/ QPS stellarator] (under construction) is based.<ref>D.A. Spong, S.P. Hirshman, J.F. Lyon, L.A. Berry and D.J. Strickler, ''Recent advances in quasi-poloidal stellarator physics issues'', [[doi:10.1088/0029-5515/45/8/020|Nucl. Fusion '''45''' (2005) 918]]</ref> | ||
* Quasi-axisymmetry (QA), on which the design of the [http://ncsx.pppl.gov/ NCSX stellarator] was based<ref> | * Quasi-axisymmetry (QA), on which the design of the [http://ncsx.pppl.gov/ NCSX stellarator] was based<ref>M.Yu. Isaev et al, ''The pseudo-symmetric optimization of the National Compact Stellarator Experiment'', [[doi:10.1063/1.873557|Phys. Plasmas '''6''', 8 (1999) 3174]]</ref> | ||
== See also == | == See also == | ||