Plasma flow measurements along the presheath of a magnetized plasma
نویسندگان
چکیده
منابع مشابه
Dynamics of a supersonic plume moving along a magnetized plasma.
A particle-in-cell code is used to investigate the evolution of a density plume moving through a background plasma with supersonic speed directed along the confinement magnetic field. For scale lengths representative of laboratory and auroral phenomena, the major nonlinear effects identified by the present simulations are the formation of a bipolar current system from the ballistic electrons, t...
متن کاملFirst experimental measurements of the plasma potential throughout the presheath and sheath at a boundary in a weakly collisional plasma.
Experimental data obtained with emissive probes and Langmuir probes show that the plasma potential profile in the presheath scales as -ephi /T(e)= sqrt[(x(0) -x)/lambda ], consistent with ion flux conservation, and that the sheath consists of a transition region and an electron-free collisionless sheath with thicknesses scaling as lambda( 1/5)lambda (4/5 )(D) and lambda(D )(ephi/ T(e))(3 /4), r...
متن کاملa magnetized plasma
An invited Perspective to mark the election of the author to the fellowship of the Royal Society in 2014. Explosive instability and erupting flux tubes in a magnetized plasma S. C. Cowley1,2, B. Cowley3, S. A. Henneberg4 and H. R. Wilson4 1CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK 2Department of Physics, Imperial College, Prince Consort Road, London SW7 2BZ, UK 3Department of Phy...
متن کاملViscosity Estimation Utilizing Flow Velocity Field Measurements in a Rotating Magnetized Plasma
The importance of viscosity in determining plasma flow structures has been widely recognized. In laboratory plasmas, however, viscosity measurements have been seldom performed so far. In this paper we present and discuss an estimation method of effective plasma kinematic viscosity utilizing flow velocity field measurements. Imposing steady and axisymmetric conditions, we derive the expression f...
متن کاملSheared-flow induced confinement transition in a linear magnetized plasma
A magnetized plasma cylinder (12 cm in diameter) is induced by an annular shape obstacle at the Large Plasma Device [W. Gekelman, H. Pfister, Z. Lucky, J. Bamber, D. Leneman, and J. Maggs, Rev. Sci. Instrum. 62, 2875 (1991)]. Sheared azimuthal flow is driven at the edge of the plasma cylinder through edge biasing. Strong fluctuations of density and potential (dn=n ed/=kTe 0:5) are observed at t...
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ژورنال
عنوان ژورنال: Physics of Fluids B: Plasma Physics
سال: 1989
ISSN: 0899-8221
DOI: 10.1063/1.859039