Ambipolar acceleration of ions in a magnetic nozzle

Arefiev, Alexey V.; Breizman, Boris N.
April 2008
Physics of Plasmas;Apr2008, Vol. 15 Issue 4, p042109
Academic Journal
This paper describes a magnetic nozzle with a magnetic mirror configuration that transforms a collisionless subsonic plasma flow into a supersonic jet expanding into the vacuum. The nozzle converts electron thermal energy into the ion kinetic energy via an ambipolar electric field. The ambipolar potential in the expanding plume involves a time-dependent rarefaction wave. Travelling through the rarefaction wave, electrons lose some kinetic energy and can become trapped downstream from the mirror throat. This work presents a rigorous adiabatic description of the trapped electron population. It examines the impact of the adiabatic cooling of the trapped electrons on the ambipolar potential and the ensuing ion acceleration. The problem is formulated for an arbitrary incoming electron distribution and then a “water-bag” electron distribution is used to obtain a closed-form analytical solution.


Related Articles

  • The g factor in a light two-body atomic system: a determination of fundamental constants to test QED. Karshenboim, S.G.; Ivanov, V.G. // Canadian Journal of Physics;Nov2002, Vol. 80 Issue 11, p1305 

    The energy levels of a two-body atomic system in an external homogeneous magnetic field can be presented in terms of the magnetic moments of their components, however, those magnetic moments being related to bound particles differ from their free values. The study of bound g-factors in simple...

  • Sona Transition Studies in the RHIC OPPIS. Kponou, A.; Zelenski, A.; Kokhanovski, S.; Zubets, V. // AIP Conference Proceedings;2/6/2008, Vol. 980 Issue 1, p241 

    In Optically Pumped Polarized Ion Sources (OPPIS), the atomic beam is first electron polarized, and then this polarization is transferred to the nucleus by a suitable perturbing magnetic field. In the BNL OPPIS, the electron polarized atomic beam experiences the perturbing field when it...

  • Regenerative soot as a source of broad band VUV light. Ahmad, Shoaib // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Feb2003, Vol. 22 Issue 2, p189 

    A mechanism is proposed for the emission of a broad band VUV light to be emitted from the regenerative sooting discharges on the basis of unusually intense intercombination lines of C+(CII) and C++(CIII) that have been observed. Comparison of these high intensity intercombination lines with the...

  • Spin-Dependent Electron Localization in Crystals. Magarill, L. I.; Chaplik, A. V. // JETP Letters;2/25/2005, Vol. 81 Issue 4, p162 

    The possibilities of spatially localizing spin-polarized electrons in two-dimensional and three-dimensional systems due to spin–orbit interaction are studied theoretically. Using simple one-dimensional potentials as examples, it is demonstrated that electrons with a definite helicity can...

  • Destabilization of magnetosonic-whistler waves by a relativistic runaway beam. Fülöp, T.; Pokol, G.; Helander, P.; Lisak, M. // Physics of Plasmas;Jun2006, Vol. 13 Issue 6, p062506 

    Magnetosonic-whistler waves may be destabilized by runaway electrons both in fusion and astrophysical plasmas. A linear instability growth rate of these waves in the presence of a runaway avalanche is calculated both perturbatively and by numerical solution of the full dispersion equation. The...

  • Polarity reversal of the magnetic field induced component of terahertz radiation from InAs surfaces at high density excitation. Nakajima, M.; Suemoto, T.; Saito, S. // Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4597 

    The excitation density dependence of radiation power and wave forms of the terahertz wave from InAs surface under magnetic fields was investigated. A drastic change of the wave forms was observed at high density excitation and was explained by the polarity reversal of the terahertz wave form...

  • Results from ALICE. Grosse-Oetringhaus, Jan Fiete // EPJ Web of Conferences;2013, Issue 52, p1004-p.1 

    ALICE, the dedicated heavy-ion experiment at the LHC, has also a rich pp program benefiting from its low material budget, low magnetic field, and its extensive particle identification capabilities. The talk presents recent measurements of relevance for cosmic-ray physics. In particular, ALICE...

  • Electron acceleration due to small pulses in shock waves in inhomogeneous plasmas: Perpendicular propagation. Sato, Masatoshi; Ohsawa, Yukiharu // Physics of Plasmas;Jun2006, Vol. 13 Issue 6, p063110 

    Electron acceleration in shock waves propagating perpendicular to an external magnetic field, which is inhomogeneous and reversed in a finite region, is studied with relativistic particle simulations. By the time a shock wave reaches the inhomogeneous region, some electrons are energized by a...

  • Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons. Coakley, K. J.; Doyle, J. M.; Dzhosyuk, S. N.; Yang, L.; Huffman, P. R. // Journal of Research of the National Institute of Standards & Tec;Jul/Aug2005, Vol. 110 Issue 4, p367 

    We compute classical trajectories of Ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and position) does not generally stabilize as the time...


Read the Article


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

Try another library?
Sign out of this library

Other Topics