Thermal Shock Testing of Candidate Compact Ignition Tokamak Graphites

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Abstract
Sandia National Laboratories, Division of Fusion Technology, has performed a series of tests in support of the Compact Ignition Tokamak first-wall tile design. A screening study was done to rank the thermal shock resistance of 25 candidate graphite materials. Standardized thermal shock samples were subjected to identical intense heat pulses generated by the electron beam test system. Most of the fine-grained graphites cracked, but none of the carbon-carbon (C-C) composite samples fractured. The best performing fine-grained graphites were, in order, Union Carbide's TS-1909, TS-1792, ATJ-S, and CGW, as well as Fiber Material Inc.'s (FMI's) high-density graphite (HDG). One graphite, FMI-HDG, and four C-C materials, FMI high-density fiber-reinforced graphite, B. F. Goodrich two-directional, FMI four-directional fine weave, and FMI four-directional coarse weave, survived to the maximum obtainable power density without failure.

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