Dresden 2017 – wissenschaftliches Programm
MA 24.6: Vortrag
Dienstag, 21. März 2017, 12:00–12:20, GER 37
Dielectric investigation methods in the THz frequency range — •Theo Scherer, Francesco Mazzocchi, and Giovanni Grossetti — Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
CVD diamond disks for high power heating applications are being investigated by different low- and high power measurement setups in the frequency range of > 100 GHz. To understand the loss mechanisms in diamond material the determination of the frequency dependence of dielectric constant and loss tangent at higher frequencies up to several THz is essential. It is well known from the experience with other window materials for high power fusion applications (ECRH) like silicon or sapphire, electrons and phonons are responsible for microwave losses. In diamond the sp2-carbon content and surface roughness determines surface losses. Additionally, the electronic surface states of such dielectrics for different chemical finishing of the diamond disks can be studied in the THz region. Different resonator setups to determine dielectric properties in the THz-range will be discussed.