TITLE

Experimental verification of the Kruskal-Shafranov stability limit in line-tied partial-toroidal plasmas

AUTHOR(S)
Oz, E.; Myers, C. E.; Yamada, M.; Ji, H.; Kulsrud, R. M.; Xie, J.
PUB. DATE
October 2011
SOURCE
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p102107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The stability properties of partial-toroidal flux ropes are studied in detail in the laboratory, motivated by ubiquitous arched magnetic structures found on the solar surface. The flux ropes studied here are magnetized arc discharges formed between two electrodes in the Magnetic Reconnection Experiment (MRX) [Yamada et al., Phys. Plasmas 4, 1936 (1997)]. The three dimensional evolution of these flux ropes is monitored by a fast visible light framing camera, while their magnetic structure is measured by a variety of internal magnetic probes. The flux ropes are consistently observed to undergo large-scale oscillations as a result of an external kink instability. Using detailed scans of the plasma current, the guide field strength, and the length of the flux rope, we show that the threshold for kink stability is governed by the Kruskal-Shafranov limit for a flux rope that is held fixed at both ends (i.e., qa = 1).
ACCESSION #
66903261

 

Related Articles

  • Macro-particle simulations of collisionless magnetic reconnection. Tanaka, Motohiko // Physics of Plasmas;Aug95, Vol. 2 Issue 8, p2920 

    Studies the basic process of collisionless reconnection in terms of coalescence of two flux bundles. Use of an implicit particle simulation of two-dimensions; Significant toroidal acceleration and streaming of the electrons without direct thermalization in the current sheet; Insensitivity of...

  • Magnetic reconnection and the topology of interacting twisted flux tubes. Lau, Y.-T.; Finn, J.M. // Physics of Plasmas;Nov96, Vol. 3 Issue 11, p3983 

    Studies the self-consistent evolution of a pair of initially straight and either parallel or antiparallel magnetic flux tubes with prescribed boundary twist, using fully compressible, three-dimensional resistive magnetohydrodynamic techniques. Exhibition of spatial chaos and chaotic scattering...

  • Simulating Solar and Astrophysical Plasmas in Laboratory Experiments and New Models Motivated by these Experiments. Bellan, P. M.; Hsu, S. C.; Hansen, J. F.; Tripathi, S. K.; You, S.; Pracko, S. E. // AIP Conference Proceedings;2004, Vol. 703 Issue 1, p425 

    Laboratory plasma configurations have been developed which simulate solar coronal loops and astrophysical jets. Observed phenomena include the magnetic pinch effect, magnetic hoop force, restraining of the hoop force by an optional externally applied “strapping” magnetic field,...

  • Tearing instabilities in multiple current sheets for current-dependent resistivity models. Birk, G.T.; Konz, C. // Physics of Plasmas;Nov97, Vol. 4 Issue 11, p4173 

    Presents a generalized analytical treatment of the resistive tearing mode in multiple current sheets for current-dependent electrical resistivities. Linear and nonlinear development of instability; Finding that reconnection in neighboring magnetic flux systems mainly results in Ohmic heating...

  • On the theory of internal kink oscillations. Breizman, B.N.; Candy, J. // Physics of Plasmas;Jun98, Vol. 5 Issue 6, p2326 

    Examines the theory of internal kink oscillations. Solution to the initial value problem for the plasma displacement; Parallelism between spatial derivative of the internal kink and perturbed particle distribution of an electrostatic wave; Implications of diamagnetic drift on the asymptotic...

  • A model for nonlinear collisionless reconnection. Lovelace, R. V. E.; Romanova, M. M. // Physics of Fluids B: Plasma Physics;Apr92, Vol. 4 Issue 4, p841 

    A model is developed for nonlinear collisionless reconnection of thin neutral layers. The model equations obey a conservation equation for the perturbation energy. The unstable solutions exhibit an initial interval of growth and subsequent large-amplitude fluctuations of the trapped magnetic...

  • Topological skeleton of the 2-D slightly non-ideal MHD system close to X-type magnetic null points -- an analysis of the general solution for the generic case. Nickeler, D. H.; Karlický, M.; Bárta, M. // Annales Geophysicae (09927689);Jun2012, Vol. 30 Issue 6, p1015 

    The appearance of eruptive space plasma processes, e.g. in eruptive flares as observed in the solar atmosphere, is usually assumed to be caused by magnetic reconnection, often connected with singular points of the magnetic field. We are interested in the general relation between the eigen-values...

  • Observations of magnetic flux ropes during magnetic reconnection in the Earth's magnetotail. Borg, A. L.; Taylor, M. G. G. T.; Eastwood, J. P. // Annales Geophysicae (09927689);May2012, Vol. 30 Issue 5, p761 

    We present an investigation of magnetic flux ropes observed by the four Cluster spacecraft during periods of magnetic reconnection in the Earth's magnetotail. Using a list of 21 Cluster encounters with the reconnection process in the period 2001-2006 identified in Borg et al. (2012), we present...

  • The role of the n[lowercase_phi_synonym]=1 column mode in spheromak formation. Cohen, B. I.; Romero-Talamás, C. A.; Ryutov, D. D.; Hooper, E. B.; LoDestro, L. L.; McLean, H. S.; Stewart, T. L.; Wood, R. D. // Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042501 

    Observations in strongly driven spheromak experiments and simulations using a time-dependent, three-dimensional, nonlinear, resistive magnetohydrodynamic code indicate that in the formation phase an n[lowercase_phi_synonym]=1 instability (n[lowercase_phi_synonym] is the toroidal Fourier mode) is...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics