Materials research under ITER-like divertor conditions at FOM Rijnhuizen

At FOM Rijnhuizen, linear plasma generators are used to investigate plasma-material interactions under high-density (<= 10(21) m(-3)), low-temperature (<= 5 eV) plasma bombardment. Research into carbon-based materials has been focused on chemical erosion by hydrogen plasmas. Results from plasma exposure to high-flux (>10(23) H(+)/m(2) s) and low-temperature hydrogen plasma indicate silicon carbide has a lower relative rate of gross erosion than other carbon-based materials (e.g. graphite, diamond, carbon-fiber composites) by a factor of 7-10. Hydrogenic retention is the focus of research on tungsten and molybdenum. For target temperatures of 700-1600 K. the temperature dependence of hydrogenic retention is the dominant factor. Damage to the surface by heavy ion irradiation has shown to enhance retention by a factor of 2.5-4.1. Thermal stressing of W via, e-beam thermal cycling also enhances hydrogenic retention by a factor of 2.1 +/- 0.2, likely due to the introduction of thermal defects, which act as trapping sites for implanted hydrogenic isotopes. (C) 2011 Elsevier B.V. All rights reserved.


Published in:
Journal of Nuclear Materials, 417, 1-3, 457-462
Year:
2011
Publisher:
Elsevier
ISSN:
0022-3115
Keywords:
Laboratories:




 Record created 2012-03-15, last modified 2018-03-17

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