PPPL-3974 is available in <a href="PPPL-3974.pdf">pdf</a> format (2.9 MB).

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<b>Measurement of Tritium Surface Distribution on TFTR Bumper Limiter Tiles</b>
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<b>Authors:</b> K. Sugiyama, T. Tanabe, C.H. Skinner, and C.A. Gentile 
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<b>Date of PPPL Report:</b> June 2004
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<b>Published in:</b> Physica Scripta <b>T108</b> (2004) 68-71.
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The tritium surface distribution on graphite tiles used in the Tokamak Fusion Test Reactor (TFTR) bumper limiter and exposed to TFTR deuterium-tritium (D-T) discharges from 1993 to 1997 was measured by the Tritium Imaging Plate Technique (TIPT). The TFTR bumper limiter shows both re-/co-deposition and erosion. The tritium images for all tiles measured are strongly correlated with erosion and deposition patterns, and long-term tritium retention was found in the re-/co-depositions and flakes. 
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The CFC tiles located at erosion dominated areas clearly showed their woven structure in their tritium images owing to different erosion yields between fibers and matrix. Significantly high tritium retention was observed on all sides of the erosion tiles, indicating carbon transport via repetition of local erosion/deposition cycles.




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