A long pulse linac for the second phase of DARHT

We present the design for an induction linac that is fed by a long pulse injector that will generate a 20 MeV, 2 kA, 2 /spl mu/s electron beam pulse for the DARHT second axis at Los Alamos National Laboratory. The accelerator cells are shielded gap cavities with Mycalex insulators and Metglas cores. A large bore (14'') block of eight cells follow the injector while the remaining 80 cells have a 10'' bore. Blocks of eight cells are interspersed with intercells that provide pumping, diagnostics and space for cell removal. RF properties of the cells have been calculated and measured. Response to BBU modes and corkscrew have been calculated. Design details of the cells, solenoids, corrector coils, intercells and pulsers will be presented along with prototype data.