Abstract
Abstract Warren has suggested that operational on very high harmonic numbers using electromagnetic undulator may be an appropriate method to achieve short wavelength lasing with a low energy beam of very high brightness. If the short wavelength requirement is relaxed but the need for extreme broadband tuning is added, one finds that higher harmonic lasing is an attractive method to achieve lasing over the entire infrared range in a single device. The undulator required is now a very inexpensive hybrid device with a moderate period. This paper will describe the design of a device utilizing a photocathode equipped microwave gun, and a short accelerator and undulator. The accelerator will have a maximum energy of 25 MeV and a peak current of 125 A in 4 ps bunches. The undulator is a fixed strength undulator with only eight periods. Gain in such a device is in the range of 20% to 50% over the range of 3 to 100 μm via harmonic lasing on harmonics up to the ninth. A ring cavity design is proposed to ease output coupling and diffraction problems. A prototype version of this system could be installed on the Mark III accelerator at Duke.
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