Measurements of the hydrogenic recombination coefficient for the TFTR vacuum vessel

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Characteristic values of the recombination rate coefficient for hydrogen and deuterium in stainless steel have been measured for the inner wall of the TFTR vacuum vessel for vessel temperatures of 25 to 100 C. In situ measurements of k/sub r/ are important for predicting the hydrogen isotope retention in the wall as a function of time, temperature, and discharge exposure, particularly because existing laboratory measurements of k/sub r/ for stainless steel span a range of four orders of magnitude. The measurement technique involved the observation of the decrease in hydrogen pressure during a glow discharge in the TFTR vacuum vessel ... continued below

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Pages: 22

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Dylla, H.F.; Cecchi, J.L. & Knize, R.J. December 1, 1983.

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Characteristic values of the recombination rate coefficient for hydrogen and deuterium in stainless steel have been measured for the inner wall of the TFTR vacuum vessel for vessel temperatures of 25 to 100 C. In situ measurements of k/sub r/ are important for predicting the hydrogen isotope retention in the wall as a function of time, temperature, and discharge exposure, particularly because existing laboratory measurements of k/sub r/ for stainless steel span a range of four orders of magnitude. The measurement technique involved the observation of the decrease in hydrogen pressure during a glow discharge in the TFTR vacuum vessel with an initial static gas fill. The resulting values of k/sub r/ at 25 C are in the range of (0.4 to 4) x 10/sup -27/cm/sup 4/-s/sup -1/ assuming a value of the hydrogenic diffusivity of 2 x 10/sup -12/cm/sup 2/-s/sup -1/ at room temperature. No significant isotopic dependence was observed and the temperature dependence of k/sub r/ is consistent with the literature value (0.5 eV) of the activation energy. The implications of this range of values of k/sub r/, for the estimation of the in-vessel tritium inventory following D-T operation in TFTR are discussed.

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Pages: 22

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NTIS, PC A02/MF A01.

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  • Symposium on energy removal and particle control and toroidal fusion devices, Princeton, NJ, USA, 26 Jul 1983

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  • Other: DE84004296
  • Report No.: PPPL-2046
  • Report No.: CONF-830795-7
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 5459566
  • Archival Resource Key: ark:/67531/metadc1067543

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1983

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 11, 2018, 3:24 p.m.

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Dylla, H.F.; Cecchi, J.L. & Knize, R.J. Measurements of the hydrogenic recombination coefficient for the TFTR vacuum vessel, article, December 1, 1983; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1067543/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.