Space-charge-limit instabilities in electron beams

Collective Effects and Instabilities in Space Charge Dominated Beams*

This paper will illustrate the use of computer simulations to study collective beam dynamics in high intensity proton rings. More and more, computer codes are used to perform desktop experiments that provide the experimenter thorough control and visualization capabilities. In this role, the simulation code confirms and demonstrates the limits of theoretical and computational analysis, aids in t...

Resistive-wall Instability Experiment in Space-charge Dominated Electron Beams

The resistive-wall instability of charged particle beams has been experimentally studied in space-charge dominated electron beams. The beam energy is in the range of 3 to 8.5 keV, the beam current is between 25 mA and 62 mA. In the experiment, electron beams produced from a thermionic cathode are passed through a 0.96 m long glass tube coated with a resistive material, and localized space-charg...

Pushing the space-charge limit in electron momentum microscopy

Tracking of Electron Beams with Numerically Determined Space Charge Forces

A tracking algorithm for the description of electron beams using grid-based space charge fields is compared to a method based on point-to-point calculations. The charged particles’ equations of motion are solved with a fifth-order embedded Runge-Kutta method using the concept of macroparticles. The space charge forces are determined in the bunch’s restframe with a multigrid-method [1].

Soliton Gas in Space-charge Dominated Beams

Based on the Vlasov-Maxwell equations describing the self-consistent nonlinear beam dynamics and collective processes, the evolution of an intense sheet beam propagating through a periodic focusing field has been studied. It has been shown that in the case of a beam with uniform phase space density the Vlasov-Maxwell equations can be replaced exactly by the hydrodynamic equations with a triple ...