Status Report on Stanford's Superconducting Heavy Ion Linac Project

Two superconducting niobium reentrant cavities resonating at 430 MHz were phase locked to within ± 0.05 rad. A quarter-wavelength resonator, operated at 215 MHz to chop the ion beam at the frequency of the accelerating cavities, was built and tested. Beam chops of less than 185 ps FWHM were obtained from a continuous 2 MeV proton beam. A double cavity structure, having the same separation between cavities and the same design details as planned for a many-cavity accelerator section, has been constructed. An assembly of two such double cavities, with associated tuners and electronics for each of the four cavities, is currently under test.