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Hydrogen isotopic effects on the chemical erosion of graphite induced by ion irradiation

Funded under: FP7-EURATOM

Abstract

This theoretical study investigates the dynamic behavior of chemical erosion of graphite due to hydrogen-isotope ion bombardment. The ion energy ranges from 10 to 1000 eV and the target temperature ranges from 300 to 1100 K. The chemical erosion processes under investigation included surface-related and thermally activated hydrocarbon emission processes. The computer code TRIDYN was employed. The proposed simulation model was fitted to experimental data by implementing surface-related and thermally activated coefficients. It is improved compared to our previous model by incorporating a depth-dependent probability for out-diffusion of hydrocarbons. The local reduction of carbon density due to either physical sputtering or chemical erosion was also taken into account. Furthermore, the erosion for all three hydrogen isotopes - hydrogen, deuterium, and tritium - was modeled. All the calculated and fitted results are in good agreement with measured data. The results from the current simulation model surpass previous ones in the low ion energy region in which chemical erosion is of vital importance.

Additional information

Authors: LIANG J H, National Tsing Hua University, Department of Engineering and System Science, Taiwan (CN);MAYER M, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);ROTH J, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);BALDEN M, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);ECKSTEIN W, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Volumes 363-365 (2007), pp. 184-189
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1016/j.jnucmat.2007.01.006
Record Number: 200719351 / Last updated on: 2007-09-06
Category: PUBLICATION
Original language: en
Available languages: en