Chemical erosion of carbon based materials in fusion devices

In the last two years the basic erosion mechanisms of carbon due to thermal and energetic hydrogen atoms have been resolved and the range of erosion yield data has been extended into new regimes of ion flux and energy. The present paper reviews the recent achievements in fundamental understanding. Model prediction of the dependence on ion energy and flux are compared with new experimental results from fusion experiments and plasma simulators. For graphites doped with B or Si the decrease of the erosion yield as function of energy and temperature indicates which elemental steps in the erosion process are influenced.

[1]  A. A. Haasz,et al.  Model for the chemical erosion of graphite due to low-energy H+ and D+ impact , 1998 .

[2]  V. Philipps,et al.  Chemical erosion of amorphous hydrogenated carbon films by atomic and energetic hydrogen , 1987 .

[3]  R. Behrisch,et al.  Sputtering by Particle Bombardment III , 1981 .

[4]  B. Winter,et al.  H atom impact induced chemical erosion reaction at C:H film surfaces , 1994 .

[5]  A. A. Haasz,et al.  Impurity release from low-Z materials under light particle bombardment , 1997 .

[6]  A. A. Haasz,et al.  Isotopic effects in hydrocarbon formation due to low-energy H+/D+ impact on graphite , 1998 .

[7]  Erosion and redeposition behavior of selected NET-candidate materials under high-flux hydrogen, deuterium plasma bombardment in pisces , 1989 .

[8]  J. Roth,et al.  Surface modifications and erosion yields of silicon and titanium doped graphites due to low energy D+ bombardment , 1996 .

[9]  S. Chiocchio,et al.  Plasma wall interactions in ITER , 1997 .

[10]  J. Roth,et al.  EROSION OF SI- AND TI DOPED GRAPHITES DUE TO DEUTERIUM IRRADIATION , 1996 .

[11]  K. Sone,et al.  Measurement of chemical sputtering yields of various types of carbon , 1980 .

[12]  J. Roth.  Erosion and Impurity Production of C and Be: A Comparison , 1987 .

[13]  P. Thrower,et al.  Influence of boron on carbon fiber microstructure, physical properties, and oxidation behavior , 1991 .

[14]  J. Bohdansky,et al.  Erosion of carbon due to bombardment with energetic ions at temperatures up to 2000 K , 1982 .

[15]  V. Philipps,et al.  In-situ observation of the chemical erosion of graphite in the scrape-off-layer of TEXTOR , 1989 .

[16]  Van de Sanden,et al.  Plasma beam deposited amorphous hydrogenated carbon: Improved film quality at higher growth rate , 1996 .

[17]  CORRIGENDUM: Analytic description of the chemical erosion of graphite by hydrogen ions , 1997 .

[18]  V. Philipps,et al.  Observation of chemical erosion of carbon based wall materials in the TEXTOR tokamak , 1996 .

[19]  A. Y. Chen,et al.  Comparison of the chemical erosion yields of doped graphites , 1995 .

[20]  J. Küppers,et al.  A model of hydrogen impact induced chemical erosion of carbon based on elementary reaction steps , 1996 .

[21]  M. Balden,et al.  Deuterium retention in carbides and doped graphites , 1998 .

[22]  J. Roth,et al.  Chemical sputtering of pyrolytic graphite and boron doped graphite USB15 at energies between 10 and 1000 eV , 1992 .