Numerical Modeling of Space-Charge-Limited Charged-Particle Emission on a Conformal Triangular Mesh

✍ Scribed by Stanley Humphries Jr.

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 417 KB
• Volume: 125
• Category: Article
• ISSN: 0021-9991
• DOI: 10.1006/jcph.1996.0110

✦ Synopsis

model confirms the approach and yields information on accuracy and strategies to ensure convergence. Section 4 Orbit tracing is a numerical technique to design high-current charged particle guns and transport systems. Although most avail-discusses application of the method on a two-dimensional able programs use the finite-difference approach to calculate electric finite-element mesh. Section 5 summarizes correction facfields, the finite-element method has advantages for accuracy and tors to improve the accuracy of space-charge-limited emisversatility. This paper describes an effective algorithm to model sion calculations from curved electrodes. The method space-charge-limited emission and a procedure to apply it to varimakes it easy to model curved and planar sources with able-resolution conformal triangular meshes with multiple emission regions. Improved tabulations of space-charge solutions for sharply mixed source-limited and space-charge-limited flow.

curved emission surfaces are given. In a benchmark Pierce diode simulation, the procedure gives an absolute current prediction within 0.2% of the analytic value and particle orbits within 0.1Њ of

2. BEAM-GENERATED FIELDS ON A

the predicted exit angle.