PBGUNS, A digital computer simulation program for the simulation of electron and ion beams of any energy

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:199706

Boers, J E ^[1]

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1. Thunderbird Simulations, Garland, TX (United States)

PBGUNS, a program for the accurate Poisson simulation of electron, and positive and negative ion beam extraction systems will be described and demonstrated. Relativistic electron guns with either space-charge limited (Childs Law), or field emission (Fowler-Nordheim) cathodes, and plasma, sputter and thermionic ion sources will be described and demonstrated. Both axisymmetric and rectangular configurations can be simulated. The simulation can be fully relativistic with induced and applied magnetic fields and crossing trajectories. Thermal spreads can be added to low energy electron beams and ion injection conditions. Potentials are solved by relaxation on a rectangular array of squares with a finer matrix (for greater accuracy) covering the cathode or plasma region. Accurate current densities are obtained at the emission surface by employing voltages a difference scale distance off the surface. Smooth electrodes are created by extending fields into electrodes, which are described by quadratic equations. Excellent agreement has been obtained with both theoretical and experimental results.

• OSTI ID: 199706
• Report Number(s): CONF-941129--
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM DYNAMICS
BEAM EXTRACTION
COMPUTERIZED SIMULATION
ELECTRON SOURCES
ION SOURCES
P CODES
POISSON EQUATION