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A cryogenic pumping system capable of pumping 300, 000 1/sec of nitrogen is proposed for the Bevatron to decrease the base pressure from ~2x10-6 to ~2 x 10-7 torr. The Bevatron consists of approximately 10,000 ft3 of free volume with approximately 15,000 ft2 of free outgassing area. The magnet pole tips, which consists of 1/2-in. laminations, add a potential 80,000 ft2 of outgassing area. The design...