5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

O5B.3 Design considerations for future DEMO gyrotrons: a review on related gyrotron activities within EUROfusion

8 Sep 2016, 17:20
20m
Meeting Hall I 1st floor (Prague Congress Centre)

Meeting Hall I 1st floor

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 3
Oral B. Plasma Heating and Current Drive O5B

Speaker

John Jelonnek (Institute for Pulsed Power and Microwave Technology (IHM))

Description

Long term options for a steady state DEMO may require the availability of gyrotrons with an operating frequency above 200 GHz together with an RF output power of significantly more than 1 MW and a total gyrotron efficiency higher than 60 %. Fast frequency tuning in steps of around 2-3 GHz will be needed for control of plasma stability. Multi-purpose operation at leaps of about 30 – 40 GHz (e. g. at 136/170/204/238 GHz) might be considered for plasma start-up, heating and current drive at different operation scenarios. The combination of all those requirements clearly challenges present day technological limits. Focusing on named aspects offers the possibilities for the development of advanced technologies. It will provide the answer to the fundamental question of maximum achievable operating frequency and corresponding output power and efficiency. At the same time, it helps to find answers to questions related to fundamental operation stability and manufacturability of RF sources operating at lower frequencies also. The R&D work within the EUROfusion WP HCD EC Gyrotron R&D and Advanced Developments (AD) is focusing on named targets. In particular, a center frequency of around 240 GHz is under investigation, considering the requirements for “multi-purpose” and “fast frequency step-tunable” operation also. In this frame, significant investments in advanced Brewster-angle window technology is considered. Coaxial-cavity gyrotron technology, and, as a possible fall-back solution, the conventional-cavity technology are under investigation. Both technologies are studied with regards to maximum achievable output power versus efficiency, operation stability and tolerances. Concerning the coaxial-cavity technology, an additional experimental investigation shall verify the predicted operation capabilities. Different promising concepts for multi-stage depressed collectors (MSDC) are under investigation. The research and development are completed by advancing the simulation and test tools capabilities significantly. A comprehensive review on the research and development will be provided in this presentation.

Co-authors

Alex Bruschi (Institute of Plasma Physics “P.Caldirola", National Research Council of Italy, Milan, Italy) Chuanren Wu (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Dirk Strauss (Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Falk Braunmueller (Swiss Plasma Center (SPC), EPFL, Lausanne, Switzerland) Gaetano Aiello (Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) George P. Latsas (Faculty of Physics, National and Kapodistrian University of Athens, Athens, Greece) Gerd Gantenbein (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Giovanni Grossetti (Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Gustavo Granucci (Institute of Plasma Physics “P.Caldirola", National Research Council of Italy, Milan, Italy) Ioannis Chelis (School of Electrical and Computer Engineering, NCSRD/National Technical University of Athens, Athens, Greece) Ioannis Gr. Pagonakis (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Ioannis Tigelis (Faculty of Physics, National and Kapodistrian University of Athens, Athens, Greece) Jianbo Jin (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Joachim Franck (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) John Jelonnek (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Konstantinos Avramidis (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Manfred Thumm (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Martin Schmid (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Minh Quang Tran (Swiss Plasma Center (SPC), EPFL, Lausanne, Switzerland) Parth Kalaria (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Saul Garavaglia (Institute of Plasma Physics “P.Caldirola", National Research Council of Italy, Milan, Italy) Sebastian Ruess (Institute of High Frequency Electronics (IHE), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Stefan Illy (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Stefano Alberti (Swiss Plasma Center (SPC), EPFL, Lausanne, Switzerland) Theo Scherer (Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Thomas Franke (EUROfusion Consortium and Max-Planck Institut für Plasmaphysik, Garching, Germany) Tomasz Rzesnicki (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) Zisis C. Ioannidis (Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany)

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