2-D large-signal modeling of VKP-8291A using TESLA

Abstract

A P-band klystron built for the Spallation Neutron Source (SNS) application was modeled using TESLA to predict small- and large-signal performances of the device. This particular klystron has six cavities, including one second-harmonic cavity. The cavity parameters as measured in the cold-test experiment were entered as input to TESLA. Measured axial magnetic field as simulated by Maxwell 2-D was input to the code. This paper presents the TESLA output, including particle trajectory plots, electric field plots at different gaps, and the variation of output power with time steps for the device under consideration. Results will also be presented on the effects of different input variables, such as the total number of axial grids, radial grids, and modes on the TESLA-predicted output power of the device.