Abstract

An adjustable iris has been developed to operate in the 10−10-Torr vacuum environment of a storage ring. It was baked out at 300°C and has been used more than 100 times. Measurements have been carried out using the spontaneous emission of an undulator set on the storage ring. They show that the iris could be centered and adjusted accurately from outside the vacuum chamber and used as a mode selector for free electron lasers.

© 1984 Optical Society of America

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