ZGOUBI USERS' GUIDE - HEP

354 DESCRIPTION OF THE AVAILABLE PROCEDURES4.1 IntroductionThis chapter gives a detailed description of how the zgoubi procedures work, and their associated keywords. It has beensplit into several sections. Sections 4.2 to 4.5 explain the underlying content and functioning of all available keywords.Section 4.6 is dedicated to the description of some general procedures that may be accessed by means of special data orflags (such as negative integration steps), or through the available keywords (such as multiturn tracking with REBELOTE).4.2 Definition of an ObjectThe description of the object, i.e., initial coordinates of the beam, must be the first element of the input data to zgoubi .Several types of automatically generated objects are available, as described in the following pages.