A procedure for determining the optimal design of an elliptical cavity is presented. Coupling between a cylindrical source and target is considered including the effects of finite source dimensions, radiation blocking by the source envelope, and reflective losses. It is found that the arc length should be at least 20 times the source envelope radius to achieve maximum efficiencies for a system with high reflectivity. A practical reflector is designed for a 100-kW continuous high-pressure argon arc that achieves an irradiance of 1.6 kW/cm2 on a 20-cm long target cylinder.
© 1984 Optical Society of America
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