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RF Behavior and Launcher Design for a Fast Frequency Step-tunable 236 GHz Gyrotron for DEMO

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Published/Copyright: December 14, 2016
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Frequenz
From the journal Frequenz Volume 71 Issue 3-4

Abstract

As part of the EUROfusion project, the conceptual design of a 1 MW 236 GHz hollow-cavity gyrotron is ongoing at IHM, KIT for a DEMOnstration Power Plant (DEMO), along with a 2 MW coaxial-cavity design concept. Fast frequency-tunable gyrotrons (tuning within a few seconds) are recommended for plasma stabilization using a non-steerable antenna. In this work, the mode-selection approach for such a frequency-tunable gyrotron is presented and suitable operating modes for fast frequency tunability are suggested. Magnetic field tuning has been studied as an effective technique to tune the gyrotron operating frequency. The step-tunability of the 236 GHz gyrotron within the frequency range of ±10 GHz in steps of 2–3 GHz is demonstrated in numerical simulations. A hybrid-type Quasi-Optical Launcher (QOL) has been designed for a step-frequency tunable gyrotron with sufficiently high Fundamental Gaussian Mode Content (FGMC).

Keywords: DEMO; frequency tenability; gyrotron; plasma instabilities control; tokamak; quasi-optical launcher

Acknowledgments

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Parts of the simulations presented in this work have been carried out using the HELIOS supercomputer at IFERC-CSC.

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Received: 2016-7-8
Published Online: 2016-12-14
Published in Print: 2017-3-1

©2017 by De Gruyter

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. GeMiC 2016
  4. Articles
  5. Design and Fabrication of a Novel Compact Bandpass Filter to Improve Spurious-Free Band
  6. Tunable Microwave Component Technologies for SatCom-Platforms
  7. Analysis and Design of a Linear Digital Programmable Gain Amplifier in a 0.13 µm SiGe BiCMOS technology
  8. 10 to 40 GHz Superheterodyne Receiver Frontend in 0.13 µm SiGe BiCMOS Technology
  9. RF Behavior and Launcher Design for a Fast Frequency Step-tunable 236 GHz Gyrotron for DEMO
  10. A Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor for Bulk and Metallized Dielectrics
  11. Characterizing Dielectric Materials using Monostatic Transmission- and Reflection-Ellipsometry
  12. Gas Flow Monitoring in High and Low Reynolds Regimes Based on Compensated FMCW-Radar Phase Measurements
  13. MIRANDA 35 GHz SAR Based Non-Coherent Change Detection
https://doi.org/10.1515/freq-2016-0212
Keywords for this article
DEMO; frequency tenability; gyrotron; plasma instabilities control; tokamak; quasi-optical launcher

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. GeMiC 2016
  4. Articles
  5. Design and Fabrication of a Novel Compact Bandpass Filter to Improve Spurious-Free Band
  6. Tunable Microwave Component Technologies for SatCom-Platforms
  7. Analysis and Design of a Linear Digital Programmable Gain Amplifier in a 0.13 µm SiGe BiCMOS technology
  8. 10 to 40 GHz Superheterodyne Receiver Frontend in 0.13 µm SiGe BiCMOS Technology
  9. RF Behavior and Launcher Design for a Fast Frequency Step-tunable 236 GHz Gyrotron for DEMO
  10. A Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor for Bulk and Metallized Dielectrics
  11. Characterizing Dielectric Materials using Monostatic Transmission- and Reflection-Ellipsometry
  12. Gas Flow Monitoring in High and Low Reynolds Regimes Based on Compensated FMCW-Radar Phase Measurements
  13. MIRANDA 35 GHz SAR Based Non-Coherent Change Detection
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