  The superconducting (SC) proton linac is proposed in the JAERI/KEK Joint
Project for a high-intensity proton accelerator in the energy region from 400
to 600 MeV. Highly stable fields in the SC cavities are required under the
dynamic Lorentz force detuning. A new model describing the dynamic Lorentz
detuning has been developed and the validity has been confirmed experimentally.
The model has been applied successfully to the rf control simulation of the SC
proton linac.
