Summary form only given. For a significant class of microwave-beamdevices, including multibeam tubes and devices with azimuthallyasymmetric interaction circuits, two-dimensional models do not provide adescription of the key physical phenomena. A fully three-dimensionalcomputational model which captures the kinetic and nonlinear aspects ofsuch devices is required. XOOPIC is in the process of being extendedfrom a 2d electromagnetic PIC code into a 3d parallel code. The 3d codewill be applied to modelling a klystron operating in the W-band. TheXOOPIC code is presently a 2d particle-in-cell code in r-z and x-ycoordinates written in C++. XOOPIC presently runs on Unix platformsranging from Linux PCs to workstations to MPI-capable parallelcomputers. Design and initial implementation of an extension from two tothree dimensions is described for the XOOPIC code. The code will beapplied to a high power klystron
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