- Propagation and scattering of electromagnetic waves in microwave and optical waveguide structures.
- Analysis and design of microwave tube components.
- Analysis and design of high-power, high-frequency gyrotron components.
- Theory and modelling of electron beam propagation in microwave structures.
- Theory and modelling of the beam-wave interaction.
- Study of the development of parasitic oscillations in microwave structures.
- Design of gyrotron components (gun, beam-tunnel, cavity).
- Propagation and scattering of electromagnetic waves in composite inomogeneous and anisotropic media and in plasma.
- Computational electromagnetics: Development and optimization of computational methods and numerical tools for the study and simulation of composite electrodynamical structures..
Gyrotron modelling
Design of gyrotron cavity with surface corrugations
Smooth gyrotron beam tunnel simulation
Stacked gyrotron beam tunnel simulation
Magnetron ejection gun simulation
Indicative Publications
- Z. C. Ioannidis, O. Dumbrajs, and I. G. Tigelis, “Eigenvalues and Ohmic Losses in Coaxial Gyrotron Cavity,” IEEE Trans. Plasma Sci., vol. 34, no. 4, pp. 1516–1522, Aug. 2006. doi: 10.1109/tps.2006.876518.
- G. P. Latsas et al., “Beam–Wave Interaction in Corrugated Structures in the Small-Signal Regime,” IEEE Trans. Plasma Sci., vol. 37, no. 10, pp. 2020–2030, Oct. 2009. doi: 10.1109/tps.2009.2029107
- G. Gantenbein et al., Experimental investigations and analysis of parasitic RF oscillations in high-power gyrotrons, Special Issue of the IEEE Transactions on Plasma Science on High-Power Microwave Generation, vol. 38, no. 6 pp. 1168-1177, 2010.
- G. P. Latsas, Z. C. Ioannidis, and I. G. Tigelis, Dependence of parasitic modes on geometry and attenuation in gyrotron beam tunnels, Special Issue of the IEEE Transactions on Plasma Science on High-Power Microwave Generation, vol. 40, no. 6, pp. 1538-1544, 2012.
- Z. C. Ioannidis, K. A. Avramidis, and I. Tigelis, “Selectivity Properties of Coaxial Gyrotron Cavities with Mode Converting Corrugations,” IEEE Trans Elec. Devices, vol. 63, no. 3., pp. 1299–1306, Mar. 2016. doi: 10.1109/ted.2016.2518217.
- T. Rzesnicki et al., “Experimental verification of the European 1 MW, 170 GHz industrial CW prototype gyrotron for ITER,” Fusion Engineering and Design, vol. 123, pp. 490–494, Nov. 2017. doi: 10.1016/j.fusengdes.2017.02.021.
- G. Chelis, K. A. Avramidis, Z. C. Ioannidis, and I. G. Tigelis, “Improved Suppression of Parasitic Oscillations in Gyrotron Beam Tunnels by Proper Selection of the Lossy Ceramic Material,” IEEE Transactions on Electron Devices, vol. 65, no. 6, pp. 2301–2307, Jun-2018.
- D. V. Peponis et al., “Dispersion properties of rectangularly‐corrugated waveguide structures by the in‐house 3D FDTD code COCHLEA in cylindrical coordinates,” IET Microwaves, Antennas & Propagation, vol. 13, no. 1, pp. 28–34, Oct. 10, 2018
- K. A. Avramidis et al., “Multifaceted Simulations Reproducing Experimental Results From the 1.5-MW 140-GHz Preprototype Gyrotron for W7-X,” IEEE Trans. Elec. Devices, vol. 68, no. 6, pp. 3063–3069, Jun. 2021. doi: 10.1109/ted.2021.3075653.
- G. Chelis et al., “High-frequency MW-class coaxial gyrotron cavities operating at the second cyclotron harmonic,” IEEE Transactions on Electron Devices, vol. 71, no. 13, Jan. 2024, doi: 10.1109/TED.2024.3356472
- I. Zelkas, G. P. Latsas, D. V. Peponis, K. A. Avramidis, and I. G. Tigelis, “Improved Suppression of Beam-Tunnel Parasitic Oscillations by Introducing Lossy Diffusive Surfaces,” IEEE Transactions on Electron Devices, vol. 71, no. 8, pp. 5053–5059, Aug-2024.