Abstract
Twelve 20-in. oil diffusion pumps are spaced around the Cosmotron's magnet ring to evacuate the vacuum chamber. These pumps, backed by 8-in. booster pumps and mechanical forevacuum pumps, are connected to manifolds in the wall of the vacuum chamber through 16-in. valves and large rectangular transition boxes. A complete system of interlocks gives fully automatic control. Present minimum operating pressure in the Cosmotron's vacuum chamber is 5×10−6 mm Hg.
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