Abstract
A 10 μm infrared FEL is being assembled to provide high efficiency operation by means of combining a linear accelerator and magnetic wiggler into a single structure. As energy is removed from the electron beam to amplify the infrared radiation, an equal amount of energy is injected into the beam from a muwave source. Thus, synchronism is maintained, and the electrons act as a catalyst for the conversion of muwave to infrared power. Comparisons will be made between the performance of an accelerator/wiggler and a tapered structure. One distinction is that the muwave power will be delayed in time so that there is maximum gain at low infrared signal levels. Another feature is that the device can be lengthened almost indefinitely to obtain more power, whereas the taper is limited to the initial value of the wiggler parameter. The system parameters will be discussed relative to the expected performance. Additional topics to be considered include beam breakup modes in the accelerator, wakefield effects, and wavelength scaling.
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