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Radiation enhanced sublimation of graphite leads to potentially high erosion rates in advanced fusion devices and may be important in the "carbon blooms" observed in TFTR and JET. Erosion rates measured by weight loss are reported for POCO graphite exposed to helium plasmas for a temperature range from 900-2000 C, ion energies of 30-300 eV, ion fluxes of 1 to 6 x 1.0 E18/cm2/s, densities of 2 to 10 x 1.0 E12/cm3, and electron temperatures of 4-10 eV. These are the first data at fusion-relevant particle fluxes, and show little reduction from a direct linear dependence upon flux. Under these conditions, the amount of redeposition and carbon self-sputtering is minimal. Over 1700 C, there is evidence of electron emission from the sample.

Additional information

Authors: NYGREN R E, Sandia National Laboratories, Sandia, Albuquerque (US);BOHDANSKY J, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);POSPIESZCZYK A, Institut für Chemie, Kernforschungsanlage Jülich GmbH, Jülich (DE);LEHMER R ET AL., University of California at Los Angeles, Los Angeles (US)
Bibliographic Reference: Article: Journal of Vacuum Science Technology A, Vol. 8 (1990) No. 3, pp. 1778-1782
Record Number: 199110559 / Last updated on: 1994-12-02
Original language: en
Available languages: en