Electrostatic beams from tailored plasmas in a Penning-Malmberg trap

Weber, T. R.; Danielson, J. R.; Surko, C. M.
December 2010
Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p123507
Academic Journal
In recent work, a technique was developed to extract high quality beams from single-component plasmas confined in a Penning-Malmberg trap in a 4.8 T magnetic field. In this paper, a procedure is developed to extract these beams from the confining magnetic field and then focus them to create especially tailored electrostatic beams. Electron beams are extracted from the field in two stages: they are first transported to a region of reduced field (1 mT), and then taken to zero field with a nonadiabatic, fast extraction. Once in the field-free region, the beams are focused using an Einzel lens. Experimental results and numerical simulations are presented to illustrate the extraction and focusing process. Theoretical expressions are developed to describe the modifications to the relevant beam energy and spatial distributions. Where possible, analytic expressions are presented for the case relevant here of beams with Gaussian radial profiles. Beam emittance considerations are discussed as well as prospects for further development of these techniques. Application of these techniques to provide high-quality positron beams is also discussed.


Related Articles

  • Magnetic field of a combined plasma trap. Kotenko, V. G.; Moiseenko, V. E.; Ågren, O. // AIP Conference Proceedings;6/19/2012, Vol. 1442 Issue 1, p167 

    This paper presents numerical simulations performed on the structure of a magnetic field created by the magnetic system of a combined plasma trap. The magnetic system includes the stellarator-type magnetic system and one of the mirror-type. For the stellarator type magnetic system the numeric...

  • Particle-in-cell simulation with Vlasov ions and drift kinetic electrons. Chen, Yang; Parker, Scott E. // Physics of Plasmas;May2009, Vol. 16 Issue 5, p052305 

    There are certain limitations in using gyrokinetic ions for simulations of turbulent transport in tokamak plasmas. Applications where Vlasov ions might be more appropriate include the electron temperature gradient driven turbulence, edge turbulence with steep density gradient, and magnetic...

  • Numerical studies of ablated-plasma dynamics and precursor current of wire-array Z-pinches. Huang, Jun; Sun, Shun-Kai; Ding, Ning; Ning, Cheng; Xiao, De-Long; Zhang, Yang; Xue, Chuang // Physics of Plasmas;Apr2011, Vol. 18 Issue 4, p042704 

    The dynamics of ablated plasmas of wire-array Z-pinches are studied numerically in (r,θ) geometry by using the magnetohydrodynamic (MHD) simulation model in which the mass injection boundary conditions are presented, and two-dimensional spatio-temporal distributions of magnetic field and...

  • Simulation of non equilibrium plasmas with a numerical noise reduced particle in cell method. Degond, P.; Deluzet, F.; Dimarco, G.; Gallice, G.; Santagati, P.; Tessieras, C. // AIP Conference Proceedings;5/20/2011, Vol. 1333 Issue 1, p1112 

    An innovative Particle In Cell method, aimed at reducing the numerical noise characterising classical PIC schemes, has been investigated in the framework of ionospheric plasma simulations. The numerical model is composed of a kinetic equation for the plasma coupled with the Maxwell-Faraday law...

  • Revisited global drift fluid model for linear devices. Reiser, Dirk // Physics of Plasmas;Jul2012, Vol. 19 Issue 7, p072317 

    The problem of energy conserving global drift fluid simulations is revisited. It is found that for the case of cylindrical plasmas in a homogenous magnetic field, a straightforward reformulation is possible avoiding simplifications leading to energetic inconsistencies. The particular new feature...

  • Particle-in-cell simulations of a current-free double layer. Baalrud, S. D.; Lafleur, T.; Boswell, R. W.; Charles, C. // Physics of Plasmas;Jun2011, Vol. 18 Issue 6, p063502 

    Current-free double layers of the type reported in plasmas in the presence of an expanding magnetic field [C. Charles and R. W. Boswell, Appl. Phys. Lett. 82, 1356 (2003)] are modeled theoretically and with particle-in-cell/Monte Carlo simulations. Emphasis is placed on determining what...

  • Implications for the electron distribution from the stationary hydrodynamic model of a one-dimensional plasma expansion into vacuum. Kiefer, Thomas; Schlegel, Theodor // Physics of Plasmas;Oct2012, Vol. 19 Issue 10, p102101 

    It is shown that the hydrodynamic model of a one-dimensional collisionless plasma expansion is contained in the kinetic description as a special case. This belongs to a specific choice for the electron distribution function. Moreover, the consequences of the use of the hydrodynamic approach...

  • Numerical Analysis of the Plasma Behavior in a Miniature Microwave Discharge Ion Thruster. Kajimura, Y.; Kanagawa, T.; Yamamoto, N.; Nakashima, H. // AIP Conference Proceedings;12/31/2008, Vol. 1084 Issue 1, p939 

    The effect of magnetic field configuration on thrust performance in a miniature microwave discharge ion thruster is investigated with numerical simulation in order to improve its thrust performance. A 2D3V DMSC-PIC code has been developed to simulate the sheath potential and to estimate the...

  • Kinetic equilibrium for an asymmetric tangential layer. Belmont, G.; Aunai, N.; Smets, R. // Physics of Plasmas;Feb2012, Vol. 19 Issue 2, p022108 

    Finding kinetic (Vlasov) equilibria for tangential current layers is a long standing problem, especially in the context of reconnection studies, when the magnetic field reverses. Its solution is of pivotal interest for both theoretical and technical reasons when such layers must be used for...


Read the Article


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

Try another library?
Sign out of this library

Other Topics