The Preliminary Results of the Pumping Speed Measurements of UHV Pump Based on the NEG for Hydrogen and its Isotopes

Now it is impossible to imagine an ultra-high vacuum system without the use of vacuum pumps based on non-evaporable getters. This paper describes the construction of non-evaporable getter pump from modern domestic materials. The measured characteristics for hydrogen and its isotopes for the application in synchrotron sources and in fusion research will be presented as well. For example, in the vacuum system of neutral beam injectors (hydrogen and deuterium pumping speeds are equal millions of liter per second by pressure of $10^{-5}$ Torr). Effective pumping speeds of prototype of the order of 1300 l/s for hydrogen and 700 l/s for deuterium were achieved. These values are in good agreement with understanding of the processes in the behavior of the non-evaporable getter pump during evacuation of hydrogen and deuterium. The reasons why the effective pumping speed for deuterium is less by two times rather than the square root from two is discussed.