European research activities towards a future DEMO gyrotron

J. Jelonnek, G. Aiello, S. Alberti, K. Avramidis, A. Bertinetti, A. Bruschi, J. Chelis, T. Franke, G. Gantenbein, S. Garavaglia, G. Granucci, G. Grossetti, S. Illy, Z.C. Ioannidis, J. Jin, P. Kalaria, G.P. Latsas, H. Laqua, A. Leggieri, F. Legrand, A. Marek, I.Gr. Pagonakis, D. Peponis, L. Savoldi, T. Rzesnicki, S. Ruess, T. Ruess, T. Scherer, M. Schmid, D. Strauss, I. Tigelis, M. Thumm, M.Q. Tran, F. Wilde, C. Wu, R. Zanino, A. Zein IHM, IHE, IAM-AWP, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany Swiss Plasma Center (SPC), EPFL, CH-1015 Lausanne, Switzerland Institute of Plasma Physics “P.Caldirola”, National Research Council of Italy, Milan, Italy NCSRD/National and Kapodistrian University of Athens, Faculty of Physics, Athens, Greece EUROfusion Consortium, Boltzmannstr. 2, D-85748 Garching, Germany Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany Max Planck Institut für Plasmaphysik, Teilinstitut Greifswald, Wendelsteinstrasse 1, D-17491 Greifswald, Germany Thales Electron Devices, 2 rue Marcel Dassault, Vélizy-Villacoublay, F-78141, France 11 NEMO group, Dipartimento Energia, Politecnico di Torino, 24, c. Duca degli Abruzzi, I-10129 Torino, Italy

[1]  S. Alberti,et al.  A New Concept for the Collection of an Electron Beam Configured by an Externally Applied Axial Magnetic Field , 2008, IEEE Transactions on Plasma Science.

[2]  Stefan Illy,et al.  Influence of emitter ring manufacturing tolerances on electron beam quality of high power gyrotrons , 2016 .

[3]  John Jelonnek,et al.  Direct Voltage Depression Calculation of Arbitrary Electron Beams in Misaligned Coaxial Gyrotron Cavities , 2016, IEEE Transactions on Electron Devices.

[4]  Stefan Illy,et al.  2.2-MW Record Power of the 170-GHz European Preprototype Coaxial-Cavity Gyrotron for ITER , 2010, IEEE Transactions on Plasma Science.

[5]  John Jelonnek,et al.  Multistage depressed collector conceptual design for thin magnetically confined electron beams , 2016 .

[6]  John Jelonnek,et al.  Systematic cavity design approach for a multi-frequency gyrotron for DEMO and study of its RF behavior , 2016 .

[7]  John Jelonnek,et al.  Conceptual designs of E × B multistage depressed collectors for gyrotrons , 2017 .

[8]  Jianbo Jin,et al.  RF Beam Parameter Measurements of Quasi-Optical Mode Converters in the mW Range , 2013, IEEE Transactions on Plasma Science.

[9]  A. Schlaich.  Time-dependent spectrum analysis of high power gyrotrons , 2015 .

[10]  J. Jelonnek,et al.  Cooling concepts for the CVD diamond brewster-angle window , 2017, 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).

[11]  T. Franke,et al.  The EC-system of EU DEMO: concepts for a reactor heating system , 2017 .

[12]  John Jelonnek,et al.  An Inverse Magnetron Injection Gun for the KIT 2-MW Coaxial-Cavity Gyrotron , 2016, IEEE Transactions on Electron Devices.

[13]  Theo Scherer,et al.  CVD diamond Brewster window: feasibility study by FEM analyses , 2012 .

[14]  John Jelonnek,et al.  First Operation of a Step-Frequency Tunable 1-MW Gyrotron With a Diamond Brewster Angle Output Window , 2014, IEEE Transactions on Electron Devices.

[15]  Stefan Illy,et al.  A 2 MW, 170 GHz coaxial cavity gyrotron , 2003 .

[16]  John Jelonnek,et al.  RF Behavior and Launcher Design for a Fast Frequency Step-tunable 236 GHz Gyrotron for DEMO , 2016 .

[17]  John Jelonnek,et al.  Novel multistage depressed collector for high power fusion gyrotrons based on an E×B drift concept , 2017, 2017 Eighteenth International Vacuum Electronics Conference (IVEC).

[18]  John Jelonnek,et al.  A generic mode selection strategy for high-order mode gyrotrons operating at multiple frequencies , 2014 .

[19]  T. P. Goodman,et al.  The European 2MW, 170GHz coaxial cavity gyrotron for ITER , 2007, 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics.

[20]  F. Albajar,et al.  Multi-physics analysis of a 1MW gyrotron cavity cooled by mini-channels , 2017 .

[21]  G. Gantenbein,et al.  Measurements of satellite modes in 140 GHz wendelstein 7-X gyrotrons: An approach to an electronic stability control , 2017, 2017 Eighteenth International Vacuum Electronics Conference (IVEC).

[22]  John Jelonnek,et al.  The 10 MW EPSM modulator and other key components for the KIT gyrotron test facility FULGOR , 2017 .

[23]  G. Dammertz,et al.  165-GHz coaxial cavity gyrotron , 2004, IEEE Transactions on Plasma Science.

[24]  G. Gantenbein,et al.  Numerical studies on the influence of cavity thermal expansion on the performance of a high-power gyrotron , 2017, 2017 Eighteenth International Vacuum Electronics Conference (IVEC).

[25]  John Jelonnek,et al.  Design and manufacturing process for the KIT 2-MW 170-GHz coaxial-cavity longer-pulse gyrotron , 2017 .