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RESEARCH and design studies at LBL that focus on free.electron lasers for various scientific applications are led by the Exploratory Studies Group, headed by Swapan Chattopadhyay of the Accelerator and Fusion Research Division. The FEL design described in detail in Chapters 3 and 4 of this report is the result of efforts by an accelerator physics and engineering team coordinated by Kwang-Je Kim, Deputy Group Leader of the ESG. Contributing to those efforts, and to this document, were

Ourlng the past few years the Defense and Electronics Center of Westinghouse Electric Corporation has developcl a solid-state, 250-kW Peak, rf ampllfler for use with the SPS-40 radar system. This system has a pulse length of 60 VS and operates across the frequency band from400 to 450 MHz. Because of the potential use of such a system as an rf source for accelerator applications, a collaborative experiment as Inltlated between Los Alamos National Laboratory ana Westinghouse to simulate the resonant load conditions of an accelerator cavity This paper describes the posltlve results of that experiment as well as the solid-state ampllfler architecture. It also explores the future of high-power, sollo-state amplifiers as rf sources for accelerator structures.