Modeling of beam transport in transverse magnetic fields

Summary form only given, as follows. The X-band klystrons being developed at the Stanford Linear Accelerator Center (SLAC) for the Next Linear Collider(NLC) use periodic permanent magnets (PPM) to focus the electron beam.. In an effort to cut magnet and manufacturing costs, a two-piece clamshell magnet and polepiece assembly was used. Measurements of 3-D magnetic fields in this assembly gave transverse fields on the order of 20 G for a PPM field with an RMS axial field of 2600 G. A series of 3-D beam transport simulations were performed to determine the effect of transverse fields on the interception on the walls of the beam tunnel. The simulations were done using the electromagnetic particle-in-cell (PIC) code, MACIC3D.