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Abstract

D(+) ions were implanted in pure and boronised graphites at temperatures between 1000 and 1600 K. The re-emitted deuterium during implantation (D(2) and HD), observed by residual gas analysis, was observed to decrease with increasing sample temperature. The amount of trapped D, as measured by thermal desorption spectrometry, subsequent to the implantation process, was also found to decrease with increasing sample temperature, and thus could not account for the decrease in the deuterium re-emission signal. Experimental evidence led to the proposed hypothesis that the observed decrease in the re-emitted deuterium was due to increasing atomic D re-emission with increasing target temperature and effective pumping of these atoms by the chamber walls. The hypothesis of atom re-emission was confirmed with the use of direct line-of-sight mass spectrometry. At 1850 K, some 95 % of the re-emitted hydrogen is in the form of atoms.

Additional information

Authors: FRANZEN P, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);VIETZKE E, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);PHILIPPS V, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);HAASZ A A, University of Toronto, Institute for Aerospace Studies (CA);DAVIS J W, University of Toronto, Institute for Aerospace Studies (CA)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 196-198 (1992) pp. 967-971
Record Number: 199310267 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en