Radio frequency heating of ceramic windows in fusion applications
Ceramic windows will be used as material barriers for radio frequency plasma heating in fusion reactors. This report examines the theory behind rf heating phenomena. Heating calculations are presented for various window materials, thicknesses, wavelengths, and power densities. The most pertinent material properties are loss tangent, thermal conductivity, dielectric constant, strength, and radiation resistance. Calculations indicate that among candidate materials, beryllium oxide offers the most promise because of its large thermal conductivity and relatively low loss tangent and dielectric constant. On the other hand, beryllia is susceptible to neutron damage, and this may adversely affect its electrical properties. Another promising candidate is sapphire, particularly at lower temperatures where the thermal conductivity is high. Fused silica suffers from low thermal conductivity and large positive temperature coefficient for loss tangent, but it may be useful under some conditions. In summary, calculations of heating can lead to elimination of some candidate materials and selection of others for further study.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5600973
- Report Number(s):
- LA-9088-MS; ON: DE82010974
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BERYLLIUM COMPOUNDS
BERYLLIUM OXIDES
CERAMICS
CHALCOGENIDES
CORUNDUM
DIMENSIONS
ELECTROMAGNETIC RADIATION
HEATING
MECHANICAL PROPERTIES
MINERALS
OPENINGS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
SAPPHIRE
STRESSES
THERMAL CONDUCTIVITY
THERMAL STRESSES
THERMODYNAMIC PROPERTIES
THICKNESS
WINDOWS
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BERYLLIUM COMPOUNDS
BERYLLIUM OXIDES
CERAMICS
CHALCOGENIDES
CORUNDUM
DIMENSIONS
ELECTROMAGNETIC RADIATION
HEATING
MECHANICAL PROPERTIES
MINERALS
OPENINGS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
SAPPHIRE
STRESSES
THERMAL CONDUCTIVITY
THERMAL STRESSES
THERMODYNAMIC PROPERTIES
THICKNESS
WINDOWS