Simulation of H− ion source extraction systems for the Spallation Neutron Source with Ion Beam Simulator

• DOI: 10.1063/1.3663244
• Publication Date: 2012-02-07T23:53:30Z
• Authors: T. Kalvas; R. F. Welton; O. Tarvainen; B. X. Han; M. P. Stockli
• Keywords: ta114; 0103 physical sciences; 01 natural sciences; 7. Clean energy

A three-dimensional ion optical code IBSimu, which is being developed at the University of Jyväskylä, features positive and negative ion plasma extraction models and self-consistent space charge calculation. The code has been utilized for modeling the existing extraction system of the H− ion source of the Spallation Neutron Source. Simulation results are in good agreement with experimental data. A high-current extraction system with downstream electron dumping at intermediate energy has been designed. According to the simulations it provides lower emittance compared to the baseline system at H− currents exceeding 40 mA. A magnetic low energy beam transport section consisting of two solenoids has been designed to transport the beam from the alternative electrostatic extraction systems to the radio frequency quadrupole.