Short wavelength free-electron laser oscilla tors require electron beams o f high brightness, and, in some application, high average power. We describe the design of an electron injector for the production o f a bunched cw electrón beam o f high brightness, low energy spread, and potentially high beam power. It consists o f a superconducting reentrant cavity housing a photoemission cathode which is irradiated with short light pulses o f a mode-locked frequency doubled Nd:YAG laser. The experi mental layout o f the "superconducting photoemission source" is described together with Its components: the photocathode preparation chamber, the cavity, the cryogenic setup, and the beam analysis system. The conceptual beam parameters are discussed and first results o f an emittance calculation using a particle in cell computer code are given.
J calculates the im pedan ce o f cylindrically sym m etric obstacles o f arbitrary shape with open side tubes. This code is specifically designed for the im pedan ce calculation above cu t-off wrhere existing resonator codes cannot be used. The num eric solution is based on the F IT-m eth od , a finite difference m eth od. It re quires the solu tion o f a large, inhom ogeneous, com p lex m atrix equation for a given frequency. A inultigrid algorithm has been set up to solve
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