Search Results - "Avramidis, A"

A Validation Roadmap of Multi-Physics Simulators of the Resonator of MW-Class CW Gyrotrons for Fusion Applications by Savoldi, Laura, Avramidis, Konstantinos A., Albajar, Ferran, Alberti, Stefano, Leggieri, Alberto, Sanchez, Francisco

“…For a few years the multi-physics modelling of the resonance cavity (resonator) of MW-class continuous-wave gyrotrons, to be employed for electron cyclotron…”
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Parasitic Oscillations in Smooth-Wall Circular Symmetric Gyrotron Beam Ducts by Genoud, J., Alberti, S., Tran, T. M., Le Bars, G., Kaminski, P., Hogge, J.-Ph, Avramidis, K. A., Tran, M. Q.

“…In order to study parasitic oscillation that may occur in a realistic beam duct upstream to the gyrotron cavity, the self-consistent linear and spectral code…”
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Recent Status and Future Prospects of Coaxial-Cavity Gyrotron Development at KIT by Illy, Stefan, Avramidis, Konstantinos A., Gantenbein, Gerd, Ioannidis, Zisis, Jin, Jianbo, Kalaria, Parth C., Pagonakis, Ioannis Gr, Ruess, Sebastian, Ruess, Tobias, Rzesnicki, Tomasz, Thumm, Manfred, Jelonnek, John

“…Coaxial-cavity gyrotrons are microwave sources that can extend the possible power levels of hollow cavity gyrotrons significantly and make them attractive for…”
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Studies towards an upgraded 1.5 MW gyrotron for W7-X by Avramidis, Konstantinos A., Ruess, Tobias, Mentgen, Felix, Jin, Jianbo, Wagner, Dietmar, Gantenbein, Gerd, Illy, Stefan, Ioannidis, C., Laqua, Heinrich P., Pagonakis, Ioannis Gr, Rzesnicki, Tomasz, Thumm, Manfred, Wolf, Robert C., Jelonnek, John

“…Studies towards a 1.5 MW, 140 GHz CW gyrotron, with the capability of MW-class operation also at 175 GHz, are ongoing at Karlsruhe Institute of Technology in…”
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Locally and globally robust Penalized Trimmed Squares regression by Avramidis, A., Zioutas, G.

“…Multiple outliers are frequently encountered in regression models used in business, economics, engineers and applied studies. The ordinary least squares (OLS)…”
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Design of a High-Q Diamond-Loaded Cavity for a Third-Harmonic Subterahertz Gyrotron Driven by a Low-Power Electron Beam by Shcherbinin, Vitalii I., Avramidis, Konstantinos A., Thumm, Manfred, Jelonnek, John

“…A continuous-wave (CW) high-harmonic gyrotron driven by a low-power electron beam is a compact radiation source demanded by terahertz applications. Its…”
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Quadratic mixed integer programming and support vectors for deleting outliers in robust regression by Zioutas, G., Pitsoulis, L., Avramidis, A.

“…We consider the problem of deleting bad influential observations (outliers) in linear regression models. The problem is formulated as a Quadratic Mixed Integer…”
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Time-Domain Simulation of Helical Gyro-TWTs With Coupled Modes Method and 3-D Particle Beam by Marek, Alexander, Avramidis, Konstantinos A., Feuerstein, Lukas, Illy, Stefan, Thumm, Manfred, Wu, Chuanren, Jelonnek, John

“…A new self-consistent time-domain model for the simulation of gyrotron traveling-wave tubes with a helically corrugated interaction space (helical gyro-TWTs)…”
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Simulation of Parasitic Backward-Wave Excitation in High-Power Gyrotron Cavities by Avramidis, Konstantinos A., Marek, Alexander, Chelis, Ioannis, Ioannidis, Zisis C., Feuerstein, Lukas, Jelonnek, John, Thumm, Manfred, Tigelis, Ioannis

“…The possibility of parasitic excitation of backward waves directly in the gyrotron cavity is demonstrated, by simulation, for two existing high-power…”
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Contributions to the Joint DFG-RSF Project - Generation of Ultra-Short Microwave Pulses by Marek, A., Avramidis, K. A., Copplestone, S. M., Ginzburg, N. S., Illy, S., Jelonnek, J., Jin, J., Mishakin, S. V., Ortwein, P., Thumm, M.

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Improved Mode Selection in Coaxial Cavities for Subterahertz Second-Harmonic Gyrotrons by Shcherbinin, Vitalii I., Moskvitina, Yuliya K., Avramidis, Konstantinos A., Jelonnek, John

“…A coaxial metal rod with partial dielectric coating is considered as a means for efficient suppression of all volume competing modes in cavities for…”
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Current Status of the KIT Coaxial-Cavity Long-Pulse Gyrotron and its Key Components by Ruess, S., Avramidis, K. A., Gantenbein, G., Ioannidis, Z., Illy, S., Kalaria, P. C., Kobarg, T., Pagonakis, I. Gr, Ruess, T., Rzesnicki, T., Thumm, M., Weggen, J., Jelonnek, J.

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Effect of strontium ranelate on lumbar spine bone mineral density in women with established osteoporosis previously treated with teriparatide by Anastasilakis, A D, Polyzos, S A, Avramidis, A, Papatheodorou, A, Terpos, E

“…Teriparatide (TPTD - recombinant human parathyroid hormone 1-34) markedly increases bone mineral density (BMD) and reduces fracture risk. Sequential treatment…”
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Improved Suppression of Beam-Tunnel Parasitic Oscillations by Introducing Lossy Diffusive Surfaces by Zelkas, Athanasios I., Latsas, George P., Peponis, Dimitrios V., Avramidis, Konstantinos A., Tigelis, Ioannis G.

“…High-power gyrotrons usually suffer from parasitic oscillations, appearing in the beam tunnel region, which degrade the electron beam quality and the…”
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Simulation of gyrotrons using the high-order particle-in-cell code PICLas by Copplestone, S. M., Ortwein, P., Munz, C.-D., Avramidis, K. A., Jelonnek, J.

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Serum osteoprotegerin and RANKL are not specifically altered in women with postmenopausal osteoporosis treated with teriparatide or risedronate: a randomized, controlled trial by Anastasilakis, A D, Goulis, D G, Polyzos, S A, Gerou, S, Koukoulis, G, Kita, M, Avramidis, A

“…Risedronate and teriparatide have opposite actions on the osteoblast-osteoclast dipole and are expected to influence the RANK/RANKL/osteoprotegerin (OPG)…”
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2018 Status of the Measurement Capabilities for Fusion Gyrotrons at KIT/IHM by Ruess, T., Avramidis, K. A., Fuchs, M., Gantenbein, G., Illy, S., Ioannidis, Z., Lutz, F. C., Ruess, S., Rzesnicki, T., Thumm, M., Wagner, D., Weggen, J., Jelonnek, J.

“…This paper gives an overview about three key measurement capabilities at KIT/IHM for fusion gyrotrons. The discussed topics are: RF window test facility, low…”
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High-Frequency MW-class Coaxial Gyrotron Cavities Operating at the Second Cyclotron Harmonic by Chelis, Ioannis G., Avramidis, Konstantinos A., Peponis, Dimitrios V., Ioannidis, Zisis C., Latsas, George P., Illy, Stefan, Jelonnek, John, Tigelis, Ioannis G.

“…Second-harmonic operation of gyrotron oscillators offers the possibility to generate millimeter and submillimeter radiation at half the value of the magnetic…”
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Design of MW-Class Coaxial Gyrotron Cavities With Mode-Converting Corrugation Operating at the Second Cyclotron Harmonic by Peponis, Dimitrios V., Avramidis, Konstantinos A., Chelis, Ioannis G., Ioannidis, Zisis C., Illy, Stefan, Jelonnek, John, Latsas, George P., Tigelis, Ioannis G.

“…This article presents investigations on the design of coaxial gyrotron cavities with mode-converting corrugations, operating at the second harmonic of the…”
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Multifaceted Simulations Reproducing Experimental Results From the 1.5-MW 140-GHz Preprototype Gyrotron for W7-X by Avramidis, Konstantinos A., Ioannidis, Zisis C., Illy, Stefan, Jin, Jianbo, Ruess, Tobias, Aiello, Gaetano, Thumm, Manfred, Jelonnek, John

“…A multifaceted simulation procedure, addressing the electron beam properties, the beam-wave interaction, and the internal losses, has been used for the…”
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