Japan Atomic Energy Research Institute (JAERI) is proposing a high intensit
y proton accelerator for the Neutron Science Project. Superconducting (SC)
RF structure is the main option for a high energy part of the linac. Design
and development work of the SC proton linac is in progress in JAERI. Three
single-cell SC prototype cavities were fabricated and their performances w
ere tested. The test results were good enough to apply to the SC linac. Thi
s paper describes the present status of the design and development work for
the SC proton linac.