Abstract
A special glass evaporation system has been constructed whose body consists of 67 mm diameter Pyrex tubing. The system has been made demountable through the use of knife-edge seals. A liquid metal ultra-high vacuum valve allows the ultra-high vacuum chamber to be disconnected from the diffusion pump. Additional pumping is performed by a liquid helium pump. A protection circuit provides safe operation of the unattended system so that the bakeout can be performed overnight with resultant shortening of the overall cycling time. Nickel—iron films are evaporated. They can be observed by the magneto-optical Kerr effect while they are still contained in the ultra-high vacuum chamber. The components of the system, the procedure to obtain pressures in the 10-10 mm Hg region, and the evaporation of the films are discussed.
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