THE EGS5 CODE SYSTEM

Chapter 4
ADVANCED EGS5 USER CODES
In this chapter we present user codes which demonstrate some of the more advanced features
and capabilities of the EGS5 Code System. We will show how to transport charged particles in
a magnetic field and how to produce and transport fluorescent photons following a photoelectric
interaction. A generalized multi-cylinder, multi-slab geometryis presented in which both splitting
and leading particle biasing are used in order to reduce the variance and speed up the calculation of
energy deposition in accelerator targets and surrounding devices. We also show how to incorporate
into EGS5 combinatorial geometry(CG) subprograms derived from MORSE-CG.
All of the user codes presented here are provided with the EGS5 distribution and the reader
should study the appropriate program listings themselves in order to gain a more complete understanding
of what they have been designed to do.
4.1 UCCYL - Cylinder-Slab Geometry and Importance Sampling
4.1.1 Generalized Multi-Cylinder, Multi-Slab Geometry
The user code UCCYL provides an example of how to set up a geometry consisting of multiple
cylindrical shells that are orthogonal to multiple slabs. The groundwork for this generalized scheme
was provided in Tutorials 6 and 7 of Chapter 3, where the geometry subprograms PLANE1 and
PLAN2P were presented. Several other geometry routines are required in the present case, including
CYLNDR, which is the cylinder analog to PLANE1. For a description of the implementation and
use of these and other auxiliary geometry routines provided with EGS5, the user is referred to
the document “How to Code Geometry: Writing Subroutine HOWFAR,” which is part of the EGS5
distribution.
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