A Collaborative National Center for Fusion & Plasma Research

A Lithium Getter Pump System ---- nventors Richard Majeski, Eugene Kearns, and John Schmitt

This invention is a device to pump volatile gases that bond to lithium in a high vacuum environment.  Typically, a crust is formed on lithium getters under the high temperatures and vacuum conditions of fusion experiments. In this invention, electromagnetic stirring of the liquid metal prevents the formation of the crust. Without stirring, the lithium must be heated to over 500 °C to dissolve the crust, which results in a high evaporation rate. The stirring allows operation at temperatures in the 300 to 400 °C range, which reduces the evaporation and the resulting build up of lithium on the walls and other surfaces.


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