Abstract
The construction and performance of a vacuum cold trap for pump oil, “O”-ring, and other vapors are described. The trap has a capacity of 16 liters of liquid nitrogen, and lasts 5 days on one filling when clean. After a period of about 6 months to 1 year of continuous use, the lifetime has dropped to about 3 days. The trap has high pumping speed, and very high trapping efficiency, requiring a minimum of 3 successive cold-surface collisions for a molecule migrating through the trap. The principles of design include the use of very thin re-entrant tubes for mechanical support of the cold reservoir thus minimizing conduction heat transfer, an inner tube for pumping and trapping, shields for reducing radiation heat transfer, and gold-plating for opposing surfaces having different temperatures. Mercury and oil diffusion pump systems are compared.
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