Waves in relativistic electron beam in low-density plasma

Electron beam density measurements in shock waves in argon

An electron beam technique was used to measure density profiles of strong shock waves in argon with high accuracy. The experimental results are compared with the results of theoretical models. Of the models that are available in enough detail for comparison, the best agreement with experiment is shown by the direct simulation Monte-Carlo method (Bird 1968), assuming an inverse 12th power molecu...

Relativistic particle acceleration in an electron-positron plasma with a relativistic electron beam

Results from three-dimensional electromagnetic particle simulations of an electron-positron plasma with a relativistic electron beam (y=2) are presented. As part of the initial conditions, a poloidal magnetic field is specified, consistent with the current carried by the beam electrons. The beam undergoes pinching oscillations due to the pressure imbalance. A transverse two-stream instability i...

Multidimensional electron beam-plasma instabilities in the relativistic regime

A relativistic beam-plasma system with electromagnetic waves

A nonlinear multiwave model that describes the interaction of an electron beam, plasma waves, and electromagnetic waves in a cold plasma is derived and studied. The derivation, which is based on slow amplitude and phase change approximations, begins with the electromagnetic Lagrangian coupled to an electron beam, a background plasma, and electrostatic and electromagnetic waves. The model obtain...

High energy density plasma science with an ultra - relativistic electron beam

An intense, high-energy electron or positron beam can have focused intensities rivaling those of today's most powerful laser beams. For example, the 5 ps (FWHM), 50 GeV beam at the Stanford Linear Accelerator Center (SLAC) at 1 kA and focused to a 3 micron rms spot size gives intensities of > 10 W/cm at a repetition rate of > 10 Hz. Unlike a ps or fs laser pulse which interacts with the surface...