1 MECO Vacuum Studies

We report the results of a study of vacuum design and performance for MECO based on current Reference Design data. The pumping system we present is properly matched to the gas loads presently understood to exist in MECO. Pump down of each vacuum volume from atmosphere to below 310 − torr is computed to take place within 26 minutes, and reach 10-4 torr at the production solenoid in less than 30 minutes & the detector solenoid within ten hours. These times can be achieved with two 16 inch diameter ducts at the down stream end of the Detector Solenoid, with pumps located between the iron return yoke and concrete shielding blocks, and one similar 16 inch duct on the upstream end of the Production Solenoid, leading to pumps on the concrete shielding roof. Based on current knowledge, we show that a realistic vacuum design for MECO can be produced which relies entirely on off-the-shelf equipment.