AbstractMechanical high vacuum pumping requirements at the JET facility, have historically been satisfied by modified commercially available 3500 l/s turbo-molecular pumps. These pumps have been used, over 17 years of experiments, but are now uneconomical to maintain due to obsolescence and tritium contamination. A novel adaptation of a new 2000 l/s turbo-drag pump has been developed to meet the present and future requirements. Two of these pumps have been installed and are used to pump the torus. These pumps offer a number of advantages, and systems on JET will continue to be upgraded to incorporate such pumps. These should be an effective solution for other large fusion experiments.
Pumping Speed of Diffusion Pumps below Limiting Pressure