<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ioannidis, Z. C.</style></author><author><style face="normal" font="default" size="100%">Latsas, G. P.</style></author><author><style face="normal" font="default" size="100%">Tigelis, I. G.</style></author><author><style face="normal" font="default" size="100%">Avramides, K. A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Parametric study on the ohmic loading of the 170-GHZ 2-MW EU coaxial gyrotron cavity</style></title><secondary-title><style face="normal" font="default" size="100%">Plasma Science (ICOPS), 2011 Abstracts IEEE International Conference on</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">axial corrugated insert</style></keyword><keyword><style  face="normal" font="default" size="100%">Cavity resonators</style></keyword><keyword><style  face="normal" font="default" size="100%">Collaboration</style></keyword><keyword><style  face="normal" font="default" size="100%">corrugation parameters</style></keyword><keyword><style  face="normal" font="default" size="100%">EU coaxial gyrotron cavity</style></keyword><keyword><style  face="normal" font="default" size="100%">Europe</style></keyword><keyword><style  face="normal" font="default" size="100%">frequency 170 GHz</style></keyword><keyword><style  face="normal" font="default" size="100%">full-wave space harmonics method</style></keyword><keyword><style  face="normal" font="default" size="100%">gyrotrons</style></keyword><keyword><style  face="normal" font="default" size="100%">Heating</style></keyword><keyword><style  face="normal" font="default" size="100%">high-frequency microwave power</style></keyword><keyword><style  face="normal" font="default" size="100%">Loading</style></keyword><keyword><style  face="normal" font="default" size="100%">ohmic loading</style></keyword><keyword><style  face="normal" font="default" size="100%">ohmic losses</style></keyword><keyword><style  face="normal" font="default" size="100%">parasitic modes</style></keyword><keyword><style  face="normal" font="default" size="100%">power 2 MW</style></keyword><keyword><style  face="normal" font="default" size="100%">resonators</style></keyword><keyword><style  face="normal" font="default" size="100%">surface impedance model</style></keyword><keyword><style  face="normal" font="default" size="100%">voltage depression</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><pages><style face="normal" font="default" size="100%">1-1</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Summary form only given. Coaxial cavity gyrotrons with axial corrugated insert are able to provide high-frequency microwave power in the MW region. The insert reduces the voltage depression and enhances the mode-selectivity of the cavity. Choosing the insert's radius and corrugation parameters properly, the parasitic modes are more easily suppressed. A major constraint in the design of such resonators is the heating of the structure due to the dissipation of part of the generated RF power of 2-3kW/cm2, whereas for the inner one this limit is up to ten times lower. The EU 2 MW, 170 GHz coaxial gyrotron cavity has been designed using the Surface Impedance Model (SIM) to calculate the ohmic loading of the insert. However, comparisons of SIM results with those obtained by the full-wave Space Harmonics Method (SHM) revealed significant discrepancies in the calculated ohmic loading. In this work, we perform a parametric study of the ohmic loading using SHM and SIM. Possible optimization, by means of minimization of ohmic losses and mode competition, of the EU coaxial gyrotron cavity is investigated.</style></abstract></record></records></xml>