MOSDC3
SLAC, Menlo Park, California, USA
Spurious oscillations remain one of the challenges in the development of high-power klystrons which prevent the tube from reaching the design performance. ACE3P is a parallel electromagnetic code suite comprising Omega3P which computes the eigenmodes of open cavities and Track3P which calculates the particle trajectory in the cavity fields. The oscillation condition is determined by the total Q of the mode which is the sum of the external Q from Omega3P and the beam loaded Q due to energy gain or loss computed with Track3P. With massively parallel computing it is possible to perform an exhaustive search of unstable modes in a given klystron from the gun to the collector on a time scale much shorter than existing tools. Application to the XC8 and LBSK klystrons at SLAC will be presented.
