Boeing 120 MeV RF linac injector design and accelerator performance comparison with PARMELA

The injector for the Boeing 120-MeV L-band RF linac was designed to produce 400-A peak current electron beam pulses with minimal emittance growth. PARMELA, a mostly three-dimensional matrix ray trace code with a two-dimensional space charge model, was used to determine the optimum setting of the injector elements for tuning purposes. The injector model predictions were used to tune the injector with very good agreement between the model and the experiment. Beam dynamics modeling from the gun through the sixth accelerating section was done with PARMELA, using experimental settings for the beamline elements. Excellent agreement between PARMELA predictions and experimental results was observed