Application of the Argus code to accelerator design calculations

Argus is a system of three-dimensional codes which share the same utilities for structure input and grid generation, memory management, data handling, and diagnostics. The field module of Argus can solve for electrostatic fields or for the complete electromagnetic fields in either the frequency or time domain. This module can be used as a stand-alone code for impedance and other cold-test calculations. In addition, Argus includes a multispecies particle-in-cell (PIC) simulation module. This module can push particles in specified fields and can function with the field module to generate self-consistent calculations of collective effects in particle beams. The module runs in a transient mode as well as in a steady-state mode (as a gun code). Applications to the four-finger cross-bar RFQ (radio-frequency quadrupole) linac and the Pierre CCVV ESQ (constant-current variable-voltage electrostatic quadrupole) accelerator and Pierce gun are considered