Pumping capacity varies depending upon the size (diameter) of the pump and the gasses you are pumping. The manufacturers usually rate them according to their ability to pump air and helium and hydrogen. See this old Varian file for additional information on diffusion pumps. 05_Diffusion_Pumps
Pumping capacity varies depending upon the size (diameter) of the pump and the gasses you are pumping. The manufacturers usually rate them according to their ability to pump air and helium and hydrogen. See this old Varian file for additional information on diffusion pumps. 05_Diffusion_Pumps
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The trap typically serves as a water vapor pump. The typical trap is cooled by liquid nitrogen or some refrigeration system. Trapping water vapor by condensation allows the diffusion pump to pump the real gasses in the system rather than water vapor. This reduces the pumping time required to reachRead more
The trap typically serves as a water vapor pump. The typical trap is cooled by liquid nitrogen or some refrigeration system. Trapping water vapor by condensation allows the diffusion pump to pump the real gasses in the system rather than water vapor. This reduces the pumping time required to reach the ultimate pressure.
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