Abstract
A brief review is given of a frequency-dependent thermal wave technique with audio-acoustic detection which is used to measure the thermal properties of solid state samples in comparison to reference materials of known properties. Two artificial graphites (Schunk & Ebe FP159I and Carbone Lorraine 5890PT) which have been used as limiter materials in the tokamak devices ASDEX and JET are analysed. A depth-dependence is found for the effusivity k ϱ c , the thermal parameter governing the temperature rise of the limiter surface after short intense heat pulses. The absolute value of the effective effusivity at the surface and that of the subsurface layers are determined. This thermal depth profile can be represented by a three-layer model and is related qualitatively to the surface roughness and volume porosity of the graphite plates.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.