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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 18: Diamond II + Poster

KFM 18.4: Vortrag

Mittwoch, 14. März 2018, 16:10–16:30, E 124

Loss mechanisms of microwave and THz radiation in poly and single crystalline diamond — •Theo Scherer — Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

To understand the microwave and THz wave propagation in poly and single crystalline diamond, the losses caused by free charge carrier absorption, dipole relaxation, phonon resonance absorption and disorder absorption will be discussed. The main loss parameter in such dielectrics is the loss tangent. Intergrain scattering effects in polycrystalline diamond are a limiting factor for further reduction of losses in that materials. The way to come to losses of < 10E-6 in loss tangent will be shown and discussed. One important application of low loss diamond in disk shape is the transmission of Megawatt power for plasma heating in future fusion reactors as electrical power plants.