Electron-beam diagnostics and results for the Los Alamos free-electron laser

In this paper, we describe the diagnostic devices used to measure various properties of the electron beam used in the Los Alamos free-electron laser. Particular emphasis is placed on the slow and fast deflectors. They give unusually detailed and valuable data concerning the correlated energy and time spread of the macropulse and individual micropulses. An analysis of the extraction efficiency measurements is presented, with special emphasis placed on the crucial role played by the Raman instability.