Towards Advanced Fusion Gyrotrons: 2018 Update on Activities within EUROfusion
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Published:2019
Issue:
Volume:203
Page:04007
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ISSN:2100-014X
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Container-title:EPJ Web of Conferences
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language:
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Short-container-title:EPJ Web Conf.
Author:
Jelonnek John,Aiello Gaetano,Alberti Stefano,Avramidis Konstantinos,Bruschi Alex,Chelis Ioannis,Franke Thomas,Gantenbein Gerd,Garavaglia Saul,Granucci Gustavo,Grossetti Giovanni,Illy Stefan,Ioannidis Zisis,Jin Jianbo,Kalaria Parth,Latsas George,Pagonakis Ioannis,Peponis Dimitrios,Rzesnicki Tomasz,Ruess Sebastian,Ruess Tobias,Scherer Theo,Schmid Martin,Strauss Dirk,Wu Chuanren,Thumm Manfred,Tigelis Ioannis,Tran Minh Quang,Wilde Fabian,Zein Andy
Abstract
During the ongoing pre-concept phase (2014 – 2020) for a possible future European DEMOnstration Fusion Power Plant (DEMO) the activities within EUROfusion WP HCD EC Gyrotron R&D and Advanced Developments are focusing on options for near-term solutions, and, at the same time, on long-term even more advanced options. The near-term target for DEMO is to realize pulsed operation. According to the current baseline it will probably use an EC system operating at 170 GHz and 204 GHz is being assessed, whereas the long-term target aims for steady-state operation and frequencies for current drive up to 240 GHz. Common targets for both are an RF output power per unit of significantly above 1 MW (target: 2 MW) and a total gyrotron efficiency of significantly higher than 60 %. Frequency step-tunability and multi-purpose/multi-frequency operation have to be considered. Those targets shall be achieved by considering the coaxial-cavity gyrotron technology and advanced technologies for key components (e.g. CVD diamond-disk Brewster angle window). Advanced simulation and test tools are complementing the research and developments. Gyrotron development is additionally supported by a significant investment into a new multi-megawatt long-pulse gyrotron test stand which is under final installation at KIT currently.
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