The name EGUN has become commonly associated with the program also known as the SLAC Electron Trajectory Program. This document is an updated version of SLAC-226, 1 published in 1979. The program itself has had substantial upgrading since then, but only a few new features are of much concern to the user. Most of the improvements are internal and are intended to improve speed or accuracy. EGUN it designed to compute trajectories of charged particles in electrostatic and magneiostatic fields, including the effects of space charge and self-magnetic fields. Starting options include Child's Law conditions on cathodes of various shapes, as well as user Specified initial conditions. Either rectangular or cylindri cal symmetry may be used. In the new jargon, the program is a 2-1/2 dimension code meaning 2-D in all Gelds and 3-D in all particle motion. A Poisson's Equa tion Solver is used to find the electrostatic fields by using difference equations derived from th£ boundary conditions. Magnetic Gelds are to be specified exter nally by the user, by using one of several methods including data from another program or arbitrary configurations of coils. This edition of the documentation also covers the program RGN87c, which is a recently developed version of EGUN designed to be used on the newer models of personal computers, small main frames, work stations, etc. The EGN87c program uses the programming language C which is very transportable so the program should operate on any system that supports C. Plotting routines for most common PC monitors are included, and the capability to make hard copy plots on dot-matrix printer-plotters is provided.

Articles you may be interested in 3D numerical simulations of negative hydrogen ion extraction using realistic plasma parameters, geometry of the extraction aperture and full 3D magnetic field mapa) Rev. Sci. Instrum. 85, 02B301 (2014); 10.1063/1.4824746 Simulating ion beam extraction from a single aperture triode acceleration column: A comparison of the beam transport codes IGUN and PBGUNS with test stand data Rev. Sci. Instrum. 79, 043304 (2008); 10.1063/1.2908170 A 3D computer simulation of negative ion extraction influenced by electron diffusion and weak magnetic field AIP Conf.

The angular correlation coefficients in the allowed beta decays of He 6 , Ne 19 , Ne 23 , and A 35 have been experimentally determined from measurements of the energy spectra of the recoil ions. The form of the beta-decay interaction has been deduced from these measurements. The experimental results are summarized in the following table together with the beta-decay interaction forms which are indicated by each measurement. IsotopeSelection rules Correlation coefficient Interaction forms He 6

No abstract