Quasisymmetry: Difference between revisions

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Quasisymmetric (quasihelically symmetric) 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>[[doi:10.1063/1.859916|D.A. Garren and A.H. Boozer, ''Existence of quasihelically symmetric stellarators'', Phys. Fluids B 3 (1991) 2822]]</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 [[Neoclassical transport]]).
This concept is part of the program of [[stellarator optimization]] (designing stellarators to have reduced transport, i.e., heat and particle losses).
<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>[[doi:10.1585/pfr.3.S1002|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'', Plasma and Fusion Research '''3''' (2008) S1002]]</ref>
* Quasihelical (QH) symmetry, on which the design of the [[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>[[doi:10.1088/0029-5515/45/8/020|D.A. Spong, S.P. Hirshman, J.F. Lyon, L.A. Berry and D.J. Strickler, ''Recent advances in quasi-poloidal stellarator physics issues'', Nucl. Fusion '''45''' (2005) 918]]</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 NCSX stellarator was based<ref>[[doi:10.1063/1.873557|M.Yu. Isaev et al, ''The pseudo-symmetric optimization of the National Compact Stellarator Experiment'', Phys. Plasmas '''6''', 8 (1999) 3174]]</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 ==

Latest revision as of 06:57, 10 April 2023

Quasisymmetric (quasihelically symmetric) plasma equilibria are non-axisymmetric configurations in which the magnetic field strength depends only on one angular coordinate within the magnetic flux surfaces. [1] This concept is part of the program of stellarator optimization (designing stellarators to have reduced transport, i.e., heat and particle losses). [2]

Types of quasisymmetry:

  • Quasihelical (QH) symmetry, on which the design of the HSX stellarator (operational) is based.[3]
  • Quasipoloidal (QP) symmetry, on which the design of the QPS stellarator (under construction) is based.[4]
  • Quasi-axisymmetry (QA), on which the design of the NCSX stellarator was based[5]

See also

References

  1. ↑ D.A. Garren and A.H. Boozer, Existence of quasihelically symmetric stellarators, Phys. Fluids B 3 (1991) 2822
  2. ↑ Iván Calvo et al, Stellarators close to quasisymmetry, Plasma Phys. Control. Fusion 55 (2013) 125014
  3. ↑ 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, Plasma and Fusion Research 3 (2008) S1002
  4. ↑ D.A. Spong, S.P. Hirshman, J.F. Lyon, L.A. Berry and D.J. Strickler, Recent advances in quasi-poloidal stellarator physics issues, Nucl. Fusion 45 (2005) 918
  5. ↑ M.Yu. Isaev et al, The pseudo-symmetric optimization of the National Compact Stellarator Experiment, Phys. Plasmas 6, 8 (1999) 3174
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