Characterization of a High-Power Klystrode Amplifier as a RF Source for Particle Acceleratoes

Abstract

This paper presents the characterization of a high-power klystrode amplifier as a RF source for particle accelerator applications. The klystrode is a relatively new type [Preist and Shrader, 1991; Preist and Shrader, 1982; Loring and Shrader, 1993; Shrader et al., 1993] RF source developed for UHF TV transmission. Two successful development efforts have extended power of the TV klyst rode technology into the particle accelerator regime [Sheikh et al., 1993]. This paper reports on the second such effort, a 250 kW continuous wave klystrode at 267 MHz. The measured efficiency, amplitude, and phase characteristics are reported over the dynamic range of the klystrode. A large-signal modeling technique is presented to predict these quantities and the measured and theoretical results are compared. Based on these results the klystrode is determined to be a very appealing candidate for accelerator service because of its high efficiency, the small variation of its efficiency with output power, and its linearity.