The EGS4 Code System
Abstract
In the seven years since EGS3 was released it has been used in a wide variety of applications. As users have pushed it to new extremes, a broad range of improvements and corrections have been made. Perhaps the greatest strength of the EGS system is a structure which allows users to develop extensions and/or implement improvements made by others. With the release of EGS4 we have undertaken to re-establish a well-defined version of the system so that we can all benefit from each other's efforts. This report consists of five chapters and seven appendices. Chapter 1 is an introduction to EGS34 and to this report in general. Chapter 2 is an update of a similar chapter in the old EGS3 report (SLAC-210), where all the gory details of the physics are gathered together. Detailed knowledge of the contents of Chapter 2 is not essential in order to use EGS, but a sophisticated user should be aware of its contents. In particular, details of the restrictions on the range of applicability of EGS are dispersed throughout the chapter. The first-time user of EGS should skip Chapter 2 and come back to it later if necessary. With the release of the EGS4 version, we have made a deliberate attempt to present more examples in order to help the user ‘get started”. These are given as a series of tutorial User Codes in Chapter 3, which lead into several more sophisticated User Codes in Chapter 4. The first-time EGS user should glance through the “official” EGS4 User Manual provided in Appendix 2, and…
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