By Topic

Frozen plasma flow from E-beam targets

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Garcia, M. ; Lawrence Livermore Nat. Lab., CA, USA

Summary form only given. An intense electron beam pulse deposits energy into a thin metal plate creating a region of hot ionized fluid, which vents as an expanding hypersonic flow with nonequilibrium ionization. This paper describes an analytical model and how it compares to experimental data from Los Alamos National Laboratory. The source temperature is proportional to the ratio of Bethe stopping power to source volume, and the shape of this volume depends on the lateral diffusion of beam electrons traversing the plate. Mass flow within the plate is modelled as a one-dimensional unsteady expansion of a perfect gas with clumped pressure waves, and the mass flow into an external vacuum is modelled as a sequence of steady hemispherical flows. The local conditions in the external flow are parametrized by Mach number, and derivatives of these relations give local gradients of temperature, velocity and density. The source volume can be highly ionized, yet on expansion the density and temperature drop so precipitously that the ionization fraction becomes both small and out of equilibrium with local conditions. The ability of the ionization fraction to adjust to local conditions increasingly lags the motion of the accelerating flow, until a point is reached where the ionization fraction is "frozen" at a fixed value. The transition between equilibrium and frozen now occurs in a narrow zone close to the plate, and the location of this zone is given by a criterion first stated by K.N.C. Bray (1959).

Published in:

Plasma Science, 1998. 25th Anniversary. IEEE Conference Record - Abstracts. 1998 IEEE International on

Date of Conference:

1-4 June 1998