Orbit – a Ring Injection Code with Space Charge

ORBIT, Objective Ring Beam Injection and Tracking, is a new C++ code developed for the Spallation Neutron Source (SNS) project to build the most intense pulsed neutron source. The code includes H foil injection modelling features needed to simulate realistic injection scenarios. Because the SNS project will produce intense pulses, 1-2x10, of low energy protons, 1 GeV, and is concerned with keeping uncontrolled beam losses to less than 1 part in 10, space charge models are provided to calculate beam halo, allowing minimisation of losses. The general code features are described, and some example calculations are shown. A more detailed description of using the code is given in a ORBIT User Manual [1].