New more compact  single stage water vapour cryopumps are based on the 15 to 18w Stirling cryocoolers at 120k Paired in– line with the more compact turbo pumps with pumping speeds in the 70 to 12 000 L/s range  they provide up to 50% faster pump down times  not achievable with turbo pumps alone to reach HV/UHV vacuum levels