Tritium retention on the Tokamak Fusion Test Reactor neutral beam components

Abstract

When the Tokamak Fusion Test Reactor begins tritium operations in 1990, two of the neutral beams will operate with tritium. In addition, the cryogenic panels in all of the beams will provide most of the pumping for the torus. Measurements were conducted at two different laboratories to measure the tritium retention on materials used in these beam lines. Experiments were performed at Los Alamos National Laboratory and Sandia National Laboratories at Livermore to examine the room-temperature adsorption of tritium on materials such as thermocouple wires, insulation, epoxy, bare metals, and painted metals. Results show the tritium retention in the neutral beams will occur primarily on the painted liquid-nitrogen-cooled panels.