Progress Report of a Cryomechanical Hybrid Vacuum Pump Prototype
A novel concept of a mechanical vacuum pump is presented and a prototype is described that is capable of operating at a low temperature of 25 K. Since gas density varies inversely with temperature, this pump delivers much higher mass flow rate at low temperature than at room temperature for a given size. Advantages of this concept are reduction in size and weight, when compared to a conventional pump scaled for the same mass flow rate at room temperature. A temperature gradient between the different pumping stages allows optimization of the exhaust pressure. This pump would be a solution for continuous tritium extraction and minimization of the mass inventory for fusion tokomaks fuel cycle control.
KeywordsMass Flow Rate Pressure Ratio Inlet Pressure Friction Torque Magnetic Bearing
Unable to display preview. Download preview PDF.
- 1.J.P. Perin, G. Claudet and F. Disdier, 18th SOFT, Karlsruhe (Germany) Aug. 22–26 1994.Google Scholar
- 2.J.P. Perin and R. Mathes, 13th International Vacuum Congress, Yokohama (Japan) Sept. 25–29 1995.Google Scholar
- 3.C.H. Kruger and A.H. Shapiro, ‘The Axial-Flow Compressor in the Free-Molecule Range’, Rarefied Gas Dynamics, Talbot, pp 141–160, New York, 1961.Google Scholar
- 4.L. Maurice, Jpn J. Appl. Phys.(suppl.), 2, 21 1974,.Google Scholar
- 5.W. Becker et al. J. Vac. Sci. Technol., 15(2), 1978.Google Scholar