A water bag model of driven phase space holes in non-neutral plasmas
- Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904 (Israel)
- Institute of Metal Physics, Ekaterinburg 620219 (Russian Federation)
The formation and control of stable multiphase space hole structures and the associated Bernstein-Greene-Kruskal modes in trapped pure ion plasmas driven by an oscillating, chirped frequency perturbation are considered. The holes are formed by passing kinetic bounce resonances {omega}{sub d}=n{pi}u/L in the system, u and L are the longitudinal velocity of the plasma species and the length of the trap, and n is the multiplicity of the resonance (the number of the phase space holes). An adiabatic, quasi-one-dimensional water bag model of this excitation for an initially flat-top distribution of the ions in the trap is suggested, based on the isomorphism with a related problem in infinite quasineutral plasmas. A multiwater bag approach allows us to generalize the theory to other initial distributions. Numerical simulations yield a very good agreement with the theory until the coherent phase space structure is destroyed due to the resonance overlap when the decreasing driving frequency passes a critical value estimated within the water bag theory.
- OSTI ID:
- 21120491
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 8; Other Information: DOI: 10.1063/1.2969738; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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