Interpretation of core localized Alfvén eigenmodes in DIII-D and Joint European Torus reversed magnetic shear plasmas

Kramer, G. J.; Nazikian, R.; Alper, B.; de Baar, M.; Berk, H. L.; Fu, G.-Y.; Gorelenkov, N. N.; McKee, G.; Pinches, S. D.; Rhodes, T. L.; Sharapov, S. E.; Solomon, W. M.; van Zeeland, M. A.
May 2006
Physics of Plasmas;May2006, Vol. 13 Issue 5, p056302
Academic Journal
Reversed shear Alfvén eigenmodes (RSAE) that were observed in the Joint European Torus (JET) [P. H. Rebut and B. E. Keen, Fusion Technol.11, 13 (1987)] and DIII-D [J. L. Luxon, Nucl. Fusion42, 614 (2002)] are studied with the ideal magnetohydrodynamic code NOVA-K [C. Z. Cheng, Phys. Rep.211, 1 (1992)]. It was found that the frequency behavior of the RSAEs can be described accurately by the NOVA-K code when plasma compressibility effects and toroidal plasma rotation are taken into account. For the mode activity on JET, the calculated drive exceeds the mode damping rate, consistent with experimental observations, while on DIII-D the growth rate from neutral beam ions for modes with high toroidal mode numbers is insufficient to account for the excitation of the modes and a major part of the drive comes from the background plasma.


Related Articles

  • General formulation of the resistive wall mode coupling equations. Pustovitov, V. D. // Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072501 

    A theoretical framework to describe the magnetic coupling of the toroidal plasma with the resistive wall and other sources of the field asymmetry is formulated. This is done for general toroidal geometry without restrictions on the plasma, while the wall is considered as a thin shell....

  • Electron Plasmas in a Small Aspect Ratio Toroidal Experiment. Pahari, S.; Ramachandran, H. S.; John, P. I.; Ganesh, R. // AIP Conference Proceedings;2006, Vol. 862 Issue 1, p78 

    Unlike their cylindrical counterparts, electron plasmas confined by purely toroidal magnetic fields have been marred with issues related to poor confinement times. Open particle trajectories due to inherent grad-B and curvature drifts lead to particle losses faster than the time taken for...

  • Four motional invariants in axisymmetric tori equilibria. Ågren, O.; Moiseenko, V. E. // Physics of Plasmas;May2006, Vol. 13 Issue 5, p052901 

    In addition to the standard set (ϵ, μ, pϕ) of three invariants in axisymmetric tori, there exists a fourth independent radial drift invariant Ir. For confined particles, the net radial drift has to be zero, whereby the drift orbit average Ir=⟨…0㟩 of the gyro center...

  • Free-boundary toroidal Alfvén eigenmodes. Chen, Eugene Y.; Berk, H. L.; Breizman, B.; Zheng, L. J. // Physics of Plasmas;May2011, Vol. 18 Issue 5, p052503 

    A numerical study is presented for the n = 1 free-boundary toroidal Alfvén eigenmodes (TAE) in tokamaks, which shows that there is considerable sensitivity of n = 1 modes to the position of the conducting wall. An additional branch of the TAE is shown to emerge from the upper continuum as the...

  • Computer simulation of a magnetohydrodynamic dynamo. II. Kageyama, Akira; Sato, Tetsuya // Physics of Plasmas;May95, Vol. 2 Issue 5, p1421 

    Describes a computer simulation of a magnetohydrodynamic dynamo in a rapidly rotating spherical shell. Influence of resistivity on total magnetic energy and total kinetic energy of convection motion; Comparison of the two ways in which the magnetic field is organized.

  • Nonlinear hydromagnetic waves in a cylindrical current-carrying plasma. II. Exact helically symmetric solutions. Hamabata, Hiromitsu // Physics of Fluids B: Plasma Physics;Dec90, Vol. 2 Issue 12, p2995 

    Exact wave solutions of the nonlinear magnetohydrodynamic equations for a highly conducting incompressible fluid within an axisymmetric container are obtained for the case when the physical quantities are helically symmetric in cylindrical coordinates. The solutions represent the waves...

  • Alfvén wave heating of low-beta, nonaxisymmetric, toroidal plasmas. Tataronis, J. A.; Lewis, H. R. // Physics of Fluids (00319171);Jan86, Vol. 29 Issue 1, p167 

    Solutions of the Alfvén wave continuum equation for a pressureless, magnetohydrodynamic plasma in nonaxisymmetric, toroidal geometry are presented. The analysis is based on the Hamiltonian form of the continuum equation along lines of force of the equilibrium magnetic field. Canonical...

  • Collisionless magnetic reconnection in the presence of a guide field. Ricci, Paolo; Brackbill, J. U.; Daughton, W.; Lapenta, Giovanni // Physics of Plasmas;Aug2004, Vol. 11 Issue 8, p4102 

    The results of kinetic simulations of magnetic reconnection in Harris current sheets are analyzed. A range of guide fields is considered to study reconnection in plasmas characterized by different β values, β>me/mi. Both an implicit particle-in-cell (PIC) simulation method and a parallel...

  • On the dispersion relation for the kinetic Alfvén wave in an inhomogeneous plasma. Lysak, Robert L. // Physics of Plasmas;Jun2008, Vol. 15 Issue 6, p062901 

    The kinetic Alfvén wave has been recognized as an important wave mode in magnetospheric plasmas and laboratory plasmas, and has potential application in many areas of cosmic plasma physics. The kinetic dispersion relation of this mode has been described including finite frequency and finite...


Read the Article


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

Try another library?
Sign out of this library

Other Topics