Kink instability

One of the earliest photos of the kink instability in action - the 3 by 25 cm pyrex tube at Aldermaston.

A kink instability (also kink oscillation or kink mode), is a current-driven plasma instability characterized by transverse displacements of a plasma column's cross-section from its center of mass without any change in the characteristics of the plasma. It typically develops in a thin plasma column carrying a strong axial current which exceeds the Kruskal–Shafranov limit[1][2][3] and is sometimes known as the Kruskal–Shafranov (kink) instability.[4][5]

The kink instability was first widely explored in fusion power machines with Z-pinch configurations in the 1950s.[6] It is one of the common magnetohydrodynamic instability modes which can develop in a pinch plasma and is sometimes referred to as the mode.[6] (The other is the mode known as the sausage instability.)

If a "kink" begins to develop in a column the magnetic forces on the inside of the kink become larger than those on the outside, which leads to growth of the perturbation.[6][7][8] As it develops at fixed areas in the plasma, kinks belong to the class of "absolute plasma instabilities", as opposed to convective processes.

References

  1. ↑ Ryutov, D. D.; Furno, I.; Intrator, T. P.; Abbate, S.; Madziwa-Nussinov, T. (2006). "Phenomenological theory of the kink instability in a slender plasma column". Physics of Plasmas. 13 (3): 032105. doi:10.1063/1.2180667. ISSN 1070-664X.
  2. ↑ DeHaas, Timothy; Gekelman, Walter; Van Compernolle, Bart (2015). "Experimental study of a linear/non-linear flux rope". Physics of Plasmas. 22 (8): 082118. doi:10.1063/1.4928888. ISSN 1070-664X.
  3. ↑ Oz, E.; Myers, C. E.; Yamada, M.; Ji, H.; Kulsrud, R. M.; Xie, J. (2011). "Experimental verification of the Kruskal-Shafranov stability limit in line-tied partial-toroidal plasmas". Physics of Plasmas. 18 (10): 102107. doi:10.1063/1.3647567. ISSN 1070-664X.
  4. ↑ Cap, Ferdinand F. (2013-09-11). Handbook on Plasma Instabilities. Academic Press. ISBN 9781483271057.
  5. ↑ Hasegawa, A. (2012-12-06). Plasma Instabilities and Nonlinear Effects. Springer Science & Business Media. ISBN 9783642659805.
  6. 1 2 3 Zohuri, Bahman (2017-02-23). Magnetic Confinement Fusion Driven Thermonuclear Energy. Springer. pp. 46–48. ISBN 9783319511771.
  7. ↑ Esmaeili, Shahriar; Nasiri, Mojtaba; Dadashi, Neda; Safari, Hossein (2016). "Wave function properties of a single and a system of magnetic flux tube(s) oscillations". Journal of Geophysical Research: Space Physics. 121 (10): 9340–9355. arXiv:1511.05472. Bibcode:2016JGRA..121.9340E. doi:10.1002/2016ja022848. ISSN 2169-9380.
  8. ↑ Plasma Dictionary Archived 2006-09-29 at the Wayback Machine.
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