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Stability of resistive wall modes in reversed field pinches with longitudinal flow and dissipative effects
The stability of the nonresonant external kink modes in a reversed field pinch (RFP) under resistive wall boundary conditions is investigated. The effects of toroidal plasma rotation and parallel visc...
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One-dimensional hybrid simulations of the imploding large Larmor radius Z pinch
The interaction of an imploding plasma–vacuum boundary (PVB) with a collisionless Z pinch for the case where the ions have orbits comparable to the radius is studied. Two principal results are fo...

Effect of a resistive vacuum vessel on dynamo mode rotation in reversed field pinches

Phys. Plasmas 6, 3878 (1999); doi:10.1063/1.873650

Issue Date: October 1999

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R. Fitzpatrick
Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712

S. C. Guo
Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy

D. J. Den Hartog and C. C. Hegna
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
Locked (i.e., nonrotating) dynamo modes give rise to a serious edge loading problem during the operation of high current reversed field pinches. Rotating dynamo modes generally have a far more benign effect. A simple analytic model is developed in order to investigate the slowing down effect of electromagnetic torques due to eddy currents excited in the vacuum vessel on the rotation of dynamo modes in both the Madison Symmetric Torus (MST) [Fusion Technol. 19, 131 (1991)] and the Reversed Field Experiment (RFX) [Fusion Eng. Des. 25, 335 (1995)]. This model strongly suggests that vacuum vessel eddy currents are the primary cause of the observed lack of mode rotation in RFX. The eddy currents in MST are found to be too weak to cause a similar problem. The crucial difference between RFX and MST is the presence of a thin, highly resistive vacuum vessel in the former device. The MST vacuum vessel is thick and highly conducting. Various locked mode alleviation methods are discussed. ©1999 American Institute of Physics.
History: Received 6 April 1999; accepted 10 June 1999
Permalink: http://link.aip.org/link/?PHPAEN/6/3878/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.55.Ez
    Physics of plasmas and electric discharges Magnetic confinement and equilibrium Z-Pinch, theta pinch, plasma focus and other pinch devices
  • 52.30.-q
    Physics of plasmas and electric discharges Plasma flow; magnetohydrodynamics
  • YEAR: 1999

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1070-664X (print)   1089-7674 (online)
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REFERENCES (29)
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  1. J. A. Wesson and D. J. Campbell, Tokamaks, 2nd ed. (Clarenden, Oxford, 1998).
  2. H. A. B. Bodin, Nucl. Fusion 30, 1717 (1990).
  3. J. B. Taylor, Phys. Rev. Lett. 33, 1139 (1974).
  4. B. Alpher, M. K. Bevir, H. A. B. Bodin et al., Plasma Phys. Controlled Fusion 31, 205 (1989).
  5. S. Ortolani and D. D. Schnack, Magnetohydrodynamics of Plasma Relaxation (World Scientific, Singapore, 1993).
  6. R. N. Dexter, D. W. Kerst, T. W. Lovell, S. C. Prager, and J. C. Sprott, Fusion Technol. 19, 131 (1991).
  7. F. Gnesotto, P. Sonato, W. R. Baker et al., Fusion Eng. Des. 25, 335 (1995).
  8. R. Fitzpatrick, "Formation and locking of the slinky mode in reversed field pinches," to appear in Phys. Plasmas.
  9. A. F. Almagri, S. Assasi, S. C. Prager, J. S. Sarff, and D. W. Kerst, Phys. Fluids B 4, 4080 (1992).
  10. V. Antoni, L. Apolloni, M. Bagatin et al., in Plasma physics and controlled nuclear fusion 1994, Proceedings 15th International Conference, Seville 1994 (International Atomic Energy Agency, Vienna, 1995), Vol. 2, p. 405.
  11. T. Bolzonella, S. Ortolani, and J. S. Sarff, in Controlled fusion and plasma physics, Proceedings 25th European Conference, Prague 1998 (European Physical Society, Petit-Lancy, 1998), p. 789.
  12. Y. Yagi, S. Sekine, T. Shimada et al., "Front-end system of the TPE-RX reversed field pinch machine," to appear in Fusion Eng. Des.
  13. Y. Yagi (private communication, 1988).
  14. S. Ortolani, (private communication, 1998).
  15. M. F. F. Nave and J. A. Wesson, Nucl. Fusion 30, 2575 (1990).
  16. The standard large aspect-ratio ordering is R0/a >> 1, where R0 and a are the major and minor radii of the plasma, respectively.
  17. The conventional definition of this parameter is beta = 2µ0<p>/<B2>, where <[centered ellipsis]> denotes a volume average, p is the plasma pressure, and B is the magnetic field strength.
  18. V. Antoni, D. Merlin, S. Ortolani, and R. Paccagnella, Nucl. Fusion 26, 1711 (1986).
  19. W. A. Newcomb, Ann. Phys. (N.Y.) 10, 232 (1960).
  20. H. P. Furth, J. Killeen, and M. N. Rosenbluth, Phys. Fluids 6, 459 (1963).
  21. R. Fitzpatrick, Nucl. Fusion 33, 1049 (1993).
  22. C. G. Gimblett, Nucl. Fusion 26, 617 (1986).
  23. D. J. Den Hartog, A. F. Almagri, J. T. Chapman et al., Phys. Plasmas 2, 2281 (1995).
  24. G. Ara, B. Basu, B. Coppi, G. Laval, M. N. Rosenbluth, and B. V. Waddell, Ann. Phys. (N.Y.) 112, 443 (1978).
  25. M. R. Stoneking, S. A. Hokin, S. C. Prager, G. Fiksel, H. Ji, and D. J. Den Hartog, Phys. Rev. Lett. 73, 549 (1994).
  26. D. E. Post, K. Borrass, J. D. Callen et al., in ITER Physics, ITER Document Series No. 21 (International Atomic Energy Agency, Vienna, 1991).
  27. A. F. Almagri, J. T. Chapman, C. S. Chiang, D. Craig, D. J. Den Hartog, C. C. Hegna, and S. C. Prager, Phys. Plasmas 5, 3982 (1998).
  28. A. K. Hansen, A. F. Almagri, D. J. Den Hartog, S. C. Prager, and J. S. Sarff, Phys. Plasmas 5, 2942 (1998).
  29. J. W. Connor and J. B. Taylor, Phys. Fluids 27, 2676 (1984).

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