Basic design considerations for a frequency step-tunable electron cyclotron wave system to suppress NTMs in DEMO

Chuanren Wu (Corresponding Author), Gaetano Aiello, Konstantinos A. Avramidis, Alessandro Bruschi, Emiliano Fable, Thomas Franke, Gerd Gantenbein, Saul Garavaglia, Gustavo Granucci, Stefan Illy, Filip Janky, John Jelonnek, Ondřej Kudláček, Alessandro Moro, Emanuele Poli, Tobias Ruess, Theo Scherer, Raphael Schramm, Mattia Siccinio, Antti SnickerDirk Strauß, Guillermo Suárez López, Giovanni Tardini, Manfred Thumm, Minh Quang Tran, Hartmut Zohm

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)


An Electron Cyclotron Wave (ECW) system will be used in the European DEMO for the stabilization of Neoclassical Tearing Modes (NTMs). In order to avoid movable mirrors in the harsh environment close to the plasma and to simplify the NTM launcher integration, the tuning of the ECW deposition location can be achieved by launching frequency-tunable ECWs from fixed mirrors while the frequency is tuned in discrete steps of 2–3GHz. An overview of the frequency step-tunable ECW system for NTM stabilization is presented. The design considerations are discussed based on the current DEMO baseline parameters and the status of technologies. A simulation of NTM stabilization with an idealized frequency tunable ECW system on an analytical NTM model is shown. The simulation takes into account a realistic tuning speed based on the present technology and considers the current NTM launcher configurations in DEMO. A simple sweeping strategy is adapted for the control of frequency. Various uncertainties, which will affect the feasibility, need to be further investigated.

Original languageEnglish
Article number112931
JournalFusion Engineering and Design
Publication statusPublished - Dec 2021
MoE publication typeA1 Journal article-refereed


  • Current drive
  • DEMO
  • Electron cyclotron wave
  • Frequency steering
  • Frequency step-tunable gyrotron
  • Heating
  • Neoclassical tearing mode


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