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Ion–solid interaction in fusion reactors

Scherzer, Bernhard M. U. (1976) Ion–solid interaction in fusion reactors. Journal of Vacuum Science and Technology, 13 (1). pp. 420-428. ISSN 0022-5355. doi:10.1116/1.568936.

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The impact of energetic ions and atoms from the plasma on the first wall causes serious problems in achieving and maintaining a thermonuclear plasma. Simple model calculations show that sputtering by working gas particles is the main source of impurities in the plasma. Wall erosion is estimated to be up to ~0.1 mm/yr. Recent experiments show that blistering due to ions and atoms in the mean energy range of the plasma particles (1–20 keV) does not contribute to wall erosion and may be completely avoided. The charge and energy distributions of working gas particles backscattered from the first wall is largely responsible for the impact of high energy resonant charge exchange neutrals on the wall. The energy distribution of backscattered neutrals differs significantly from that of ions. High amounts of gas may be trapped in the first wall, but a reemission factor of one will be attained for most materials after a short starting period. High trapping efficiencies for hydrogen even at very high doses are found in materials like Ti and Zr. This may be helpful in increasing the pumping efficiency of a divertor.

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Additional Information:© 1976 American Vacuum Society. (Received 27 August 1975; in revised form 6 October 1975) I want to thank my colleagues of the plasma-wall-interaction group at Max-Planck-Institut für Plasmaphysik, Garching. The work of this group constitutes a large part of this report. Especially, Dr. Vernickel contributed critical comments on the first part of the manuscript, Dr. Behrisch, Dr. Eckstein, Dr. Roth, and Dr. Verbeek have given helpful advice and provided unpublished data. Special thanks are due to Dr. J. W. Mayer and Dr. M-A. Nicolet for giving me the opportunity of writing this report in the stimulating scientific atmosphere of Caltech. Finally, I am highly indebted to Carol Norris for excellent typing of my almost unreadable manuscript.
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Subject Keywords:thermonuclear reactor walls; erosion; sputtering; desorption; physical radiation effects; hydrogen ions; helium ions; impurities; plasma confinement; divertors; thermonuclear reactors; plasma density; energy spectra; backscattering; hot plasma; efficiency; magnetic fields
Issue or Number:1
Classification Code:PACS: 28.50.Re, 61.80.Ki
Record Number:CaltechAUTHORS:SCHEjvst76
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Official Citation:Ion--solid interaction in fusion reactors Bernhard M. U. Scherzer, J. Vac. Sci. Technol. 13, 420 (1976), DOI:10.1116/1.568936
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7692
Deposited By: Archive Administrator
Deposited On:29 Jun 2010 20:44
Last Modified:08 Nov 2021 20:44

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