Abstract
The Free Electron Maser (FEM) constructed at the FOM Institute, Netherlands is now ready to undergo the first set of short pulse ( <20 μ s) experiments to demonstrate the capability of generating 1 MW of microwave power in the range 130–250 GHz. Predictions of the FEM performance requires a time-dependent multi-frequency simulation code which can include the detailed frequency dependence of the measured microwave transmission and feedback system, the time-dependent voltage pulse and the initial shot noise in the electron beam. Simulations predict that in spite of imperfections in the microwave circuit, transmission losses and a substantial voltage droop of 0.34% per μs, megawatt levels of microwave power will be generated and observed within the 10–20 μs voltage pulse.
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