Effects of surface processes on hydrogen outgassing from metal in desorption experiments

Guterl, Jerome; Smirnov, R. D.; Snyder, P.

doi:10.1088/1741-4326/ab280a

Title: Effects of surface processes on hydrogen outgassing from metal in desorption experiments

Journal Article · 10 June 2019 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab280a · OSTI ID:1564267

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Oak Ridge Associated Universities at General Atomics, San Diego, CA (United States); General Atomics
Univ. of California, San Diego, CA (United States)
General Atomics, San Diego, CA (United States)

In this study, effects of surface processes on hydrogen outgassing during desorption experiments are investigated using a standard reaction-diffusion model describing hydrogen transport, retention and desorption in material. Three mechanisms for hydrogen migration and desorption on material surface are considered: hydrogen migration from material bulk to material surface (readsorption), hydrogen migration from material surface to material bulk (reabsorption) and hydrogen desorption from material surface by molecular recombination. Three hydrogen outgassing regimes are identified: i) recombination-limited outgassing when hydrogen recombination and desorption is fast compared to hydrogen reabsorption and slow compared to hydrogen transport from material bulk onto material surface ii) reabsorption-limited outgassing when hydrogen recombination and desorption is slow compared to hydrogen reabsorption and when the effective hydrogen recombination and desorption is slow compared to hydrogen transport from material bulk onto material surface iii) bulk-limited outgassing otherwise. Regimes of hydrogen outgassing from tungsten and beryllium are estimated for various experimental conditions. Analytical expressions of the outgassing flux are then derived for each outgassing regime, and used to characterize TDS spectra obtained in TDS experiments. It is shown that TDS spectra in recombination-limited regime are skewed toward high temperature, while TDS spectra in reabsorptionlimited and bulk-limited regimes are skewed toward low temperature. Furthermore, the temperature of the desorption peak in TDS spectra is shown to decrease in recombination-limited regime and to increase in reabsorption-limited and bulk-limited regimes as the total amount of hydrogen stored in material increases. Lastly, it is observed that the effective hydrogen recombination rate measured in reabsorption-limited permeations experiments may be not be reliably used to model and predict hydrogen retention and recycling from tungsten during plasma operations in tokamak.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0018302; SC0018423

OSTI ID:: 1564267

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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