Layered and doped materials for plasma-facing components
- Inst. fur Plasmaphysik, Forschungszentrum Julich GmbH, Association Euratom/KFA, Postfach 1913, W-5170 (DE)
The performance of tokamaks under normal operating conditions, has indicated problems associated with the use of graphite and amorphous hydrogenated carbon (a-C:H) films produced in situ by carbonization. These include unwanted release of oxygen and carbon into the plasma core and difficulties in controlling the plasma density in the boundary layer for entering into the supershot regime and the hot-ion mode, i.e., regimes where the rate of fusion reactions became substantial. Boron and beryllium have been introduced to overcome these problems. Boron-carbon systems such as doped graphites, boron carbide (B{sub 4}C) coat mix materials, plasma-sprayed B{sub 4}C graphites, and amorphous boron-containing hydrogenated carbon (a-C/B:H) films produced in situ by boronization are under investigation today, and some of these have performed quite well in tokamaks. The same holds true for beryllium, which is introduced into the tokamak by evaporation techniques or as tiles.
- OSTI ID:
- 6044542
- Journal Information:
- Fusion Technology; (United States), Vol. 19:4; ISSN 0748-1896
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
Ma
CARBON
PERFORMANCE TESTING
GRAPHITE
REACTOR COMPONENTS
MATERIALS TESTING
BORON CARBIDES
BORON NITRIDES
DOPED MATERIALS
RESEARCH PROGRAMS
THERMONUCLEAR REACTOR MATERIALS
TOKAMAK DEVICES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CLOSED PLASMA DEVICES
ELEMENTAL MINERALS
ELEMENTS
MATERIALS
MINERALS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
TESTING
THERMONUCLEAR DEVICES
700420* - Fusion Technology- Plasma-Facing Components- (1992-)
360605 - Materials- Radiation Effects
700480 - Fusion Technology- Component Development
Materials Studies- (1992-)