Search Results - "TIGELIS, I. G"

Experimental Results of the EU ITER Prototype Gyrotrons by Gantenbein, G., Albajar, F., Alberti, S., Avramidis, K., Bin, W., Bonicelli, T., Bruschi, A., Chelis, J., Fanale, F., Legrand, F., Hermann, V., Hogge, J.-P., Illy, S., Ioannidis, Z. C., Jin, J., Jelonnek, J., Kasparek, W., Latsas, G. P., Lechte, C., Lontano, M., Pagonakis, I. G., Rzesnicki, T., Schlatter, C., Schmid, M., Tigelis, I. G., Thumm, M., Tran, M. Q., Vomvoridis, J. L., Zein, A., Zisis, A.

“…The European 1 MW, 170 GHz CW industrial prototype gyrotron for ECRH&CD on ITER was under test at the KIT test facility during 2016. In order to optimize the…”
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Dispersion characteristics of a rectangular waveguide grating by Maragos, A.A., Ioannidis, Z.C., Tigelis, I.G.

“…We study the dispersion characteristics of a rectangular waveguide grating for microwave amplifier applications. The Floquet theorem and an appropriate…”
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Recent experiments with the European 1MW, 170GHz industrial CW and short-pulse gyrotrons for ITER by Ioannidis, Z. C., Albajar, F., Alberti, S., Avramidis, K. A., Bin, W., Bonicelli, T., Bruschi, A., Chelis, J., Fanale, F., Gantenbein, G., Genoud, J., Hogge, J.-P., Hermann, V., Illy, S., Jelonnek, J., Jin, J., Kasparek, W., Latsas, G. P., Legrand, F., Lechte, C., Pagonakis, I. Gr, Rzesnicki, T., Sánchez, F., Schlatter, C., Schmid, M., Tigelis, I. G., Thumm, M., Tran, M. Q., Zisis, A., Zein, A.

“…•Status of the experiments with the EU 170 GHz, 1 MW CW industrial prototype gyrotron for ITER.•Possible upgrades of the EU 170 GHz, 1 MW SP prototype gyrotron…”
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Dependence of Parasitic Modes on Geometry and Attenuation in Gyrotron Beam Tunnels by Latsas, G. P., Ioannidis, Z. C., Tigelis, I. G.

“…Recent high-power gyrotrons, capable of producing radio-frequency power above 1 MW, often suffer from parasitic oscillations in the beam tunnel, despite the…”
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Reflectivity properties of an abruptly ended asymmetrical slab waveguide for the case of transverse magnetic modes by Latsas, G, Manenkov, A B, Tigelis, I G, Sarri, E

“…We deal with the scattering phenomenon from an abruptly terminated asymmetrical slab waveguide for the case of transverse magnetic (TM) modes. The analysis…”
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Calculations on the Beam-Wave Interactions in Coaxial Gyrotron Beam Tunnels by Latsas, G P, Moraitou, M D, Ioannidis, Z C, Tigelis, I G

“…We present the mathematical formulation and numerical results for the beam-wave interaction in a coaxial waveguide with rectangular slots filled with a lossy…”
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Experimental verification of the European 1 MW, 170 GHz industrial CW prototype gyrotron for ITER by Rzesnicki, T., Albajar, F., Alberti, S., Avramidis, K.A., Bin, W., Bonicelli, T., Braunmueller, F., Bruschi, A., Chelis, J., Frigot, P.-E., Gantenbein, G., Hermann, V., Hogge, J.-P., Illy, S., Ioannidis, Z.C., Jin, J., Jelonnek, J., Kasparek, W., Latsas, G.P., Lechte, C., Lontano, M., Kobarg, T., Pagonakis, I.G., Rozier, Y., Schlatter, C., Schmid, M., Tigelis, I.G., Thumm, M., Tran, M.Q., Vomvoridis, J.L., Zisis, A.

“…The EU 1 MW, 170 GHz gyrotron with hollow cylindrical cavity have been designed within the European GYrotron Consortium (EGYC) in collaboration with the…”
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Scattering of modes by the end of a diaphragm-loaded planar dielectric waveguide by Manenkov, A. B., Gerolymatos, P. G., Tigelis, I. G.

“…A planar dielectric waveguide loaded with an infinitely thin perfectly conducting diaphragm is considered. The problem of the guided mode reflection from the…”
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Azimuthal Mode Coupling in Coaxial Waveguides and Cavities With Longitudinally Corrugated Insert by Ioannidis, Z C, Avramides, K A, Latsas, G P, Tigelis, I G

“…Coaxial resonant cavities with longitudinal corrugations on the inner conductor are used in high-frequency high-power gyrotrons as means to reduce the number…”
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FDTD Analysis of Cylindrical Waveguides With Both Axial and Azimuthal Corrugations by Peponis, Dimitrios V., Latsas, George P., Chelis, Ioannis G., Avramidis, Konstantinos A., Ioannidis, Zisis C., Tigelis, I. G.

“…Cylindrical waveguides with both axial and azimuthal corrugations can be found in a variety of microwave devices, where they operate mainly as mode converters…”
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The Effect of the Lossy Material on the Modes in a Smooth Metallic Dielectric Loaded Gyrotron Beam Tunnel by Latsas, G. P., Tigelis, I. G., Genoud, J., Alberti, S.

“…In this work, we have studied the effect of the dielectric material on the properties of the modes in a smooth metallic gyrotron beam tunnel partially filled…”
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Calculation of the electromagnetic waves in nonperiodic corrugated waveguides With Dielectric loading by Anastasiou, G.P., Latsas, G.P., Tigelis, I.G., Dehler, M., Queffelec, P., Dasyras, N.F.

“…We present the mathematical analysis, based on an eigenfunction expansion, and the main steps of the corresponding numerical code developed to calculate the…”
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High-frequency electromagnetic modes in a dielectric-ring loaded beam tunnel by Tigelis, I.G., Vomvoridis, J.L., Tzima, S.

“…A numerical code (PERIODIC-HYBRID) is developed for the calculation of the dispersion relation, the electromagnetic field components, and the quality factor of…”
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Reflection of a surface mode from an abruptly terminated planar asymmetric waveguide by Manenkov, A. B., Tigelis, I. G.

“…The variational approach and integral equation method are applied to the problem of surfacemode reflection from an abruptly terminated planar dielectric…”
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Parasitic Oscillations in Coaxial Gyrotron Beam Tunnels by Moraitou, Marina D., Latsas, G. P., Ioannidis, Z. C., Tigelis, I. G.

“…High-power high-frequency gyrotrons are required for several applications, including plasma heating, current drive, and plasmas stabilization for controlled…”
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The contribution of higher-order spatial harmonics in eigenvalues and ohmic losses calculations in coaxial corrugated cavities by Ioannidis, Z C, Avramides, K A, Kern, S, Latsas, G P, Tigelis, I G

“…The Spatial Harmonics Method has been used to study TE modes in a coaxial corrugated cavity. A numerical code has been developed to calculate eigenvalues,…”
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Calculation of eigenmodes in a nonperiodic corrugated waveguide by Tigelis, I.G., Pedrozzi, M., Cottis, P.G., Vomvoridis, J.L.

“…A theoretical technique for determining the dispersion relation, the electromagnetic field components, and the quality factor of a dielectric-loaded…”
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Parametric study on the effect of the dielectric and geometry properties on the parasitics in gyrotron beam tunnels by Latsas, G P, Tigelis, I G, Moraitou, M D, Kern, S, Vomvoridis, J L, Ioannidis, Z C

“…Using the numerical code Fishbone, developed to study the parasitic oscillations in gyrotron beam tunnels, a parametric study is performed on the effect of the…”
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Small-signal analysis of the cyclotron resonance maser in a system with axial nonuniformities by Vomvoridis, J.L., Tigelis, I.G.

“…The small-signal cyclotron resonance maser (CRM) interaction in a system with axial gradients is treated analytically in order to investigate the possibility…”
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Calculations on the Beam-Wave Interactions in Coaxial Gyrotron Beam Tunnels: SPECIAL ISSUE ON HIGH-POWER MICROWAVE GENERATION by LATSAS, G. P, MORAITOU, M. D, IOANNIDIS, Z. C, TIGELIS, I. G

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