Studies of tritiated co-deposited layers in TFTR Page: 3 of 18
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Studies of Tritiated Co-deposited Layers in TFTR
C.H. Skinner, C.A. Gentile, G. Ascione, A. Carpe, R.A. Causey,a T. Hayashi,'
J. Hogan,' S. Langish, M. Nishi,d W.M. Shu,d W.R. Wamplera and K. M. Young
Princeton Plasma Physics Laboratory, Princeton, New Jersey, 08543 USA
"Sandia National Laboratories, Albuquerque NM 87175 and Livermore CA 94550
Oak Ridge National Laboratory, Oak Ridge, TN 37830
dTritium Engineering Laboratory, JAERI, Ibaraki, Japan
Plasma facing components in TFTR contain an important record of plasma wall
interactions in reactor grade DT plasmas. Tiles, flakes, wall coupons, a stainless steel shutter and
dust samples have been retrieved from the TFTR vessel for analysis. Selected samples have been
baked to release tritium and assay the tritium content. The in-vessel tritium inventory is estimated
to be 0.56 g and is consistent with the in-vessel tritium inventory derived from the difference
between tritium fueling and tritium exhaust. The distribution of tritium on the limiter and vessel
wall showed complex patterns of co-deposition. Relatively high concentrations of tritium were
found at the top and bottom of the bumper limiter, as predicted by earlier BBQ modeling.
Keywords: tritium retention, tritium co-deposition, flakes, dust, nuclear fusion.
Tritium issues are central to the development of fusion power[l]. A significant milestone was
reached when deuterium - tritium plasmas in TFTR and JET produced 10 and 16 MW of fusion
power respectively[2,3]. Tritium was retained inside the vacuum vessel of both TFTR and JET
principally by co-deposition with carbon eroded from plasma facing components[4,5]. Tritium
operations on TFTR extended over 3.5 years with 5 g of tritium supplied to the plasma via neutral
beam injection and gas puffs. Extensive deuterium fueled discharges were used to optimize the
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Skinner, C.H.; Gentile, C.A.; Ascione, G.; Carpe, A.; Causey, R.A.; Hayashi, T. et al. Studies of tritiated co-deposited layers in TFTR, report, June 28, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc709360/m1/3/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.