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Title: Liquid impedance matching system for Ion Cyclotron heating

Abstract

Ion Cyclotron Range of Frequency (ICRF) heating on the Large Helical Device (LHD) is characterized by high power (up to 12MW) and by steady-state operation (30 minutes). Research and development for ICRF heating have been carried out in recent years. A newly developed liquid stub tuner has demonstrated highly reliable performance as a stub tuner; it has withstood 63kV for 10 seconds and 50kV for 30 minutes. The liquid surface level could be shifted under high RF voltage without breakdown. A liquid impedance matching system has been designed and fabricated for ICRF heating on the LHD. This system consists of a liquid stub tuner and a liquid phase shifter. The liquid phase shifter was constructed by connecting two liquid stub tuners in a U-shaped configuration. An impedance matching can be acquired in a wide frequency range, i.e., 25-95MHz by selecting the length of 4m for the liquid stub tuner. At some frequencies, it was a problem that the RF voltage at the phase shifter became higher than that between the RF antenna and the impedance matching system. However, this difficulty has been resolved by adopting the use of asymmetrical heights of liquid surface levels at the U-shaped liquid phase shifter.

Authors:
; ; ; ; ;  [1]; ;  [2];  [3];  [4]
  1. National Institute for Fusion Science, Toki, 509-5292 (Japan)
  2. Nagoya University, Faculty of Engineering, 464-8601 (Japan)
  3. Max-Planck-Institute fuer Plasmaphysik, D-85748 Garching (Germany)
  4. Academia Sinica Plasma Physics Institute, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
21210503
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Conference: 13. topical conference on radio frequency power in plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: DOI: 10.1063/1.59757; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; ELECTRIC POTENTIAL; ICR HEATING; IMPEDANCE; ION CYCLOTRON-RESONANCE; LHD DEVICE; LIQUIDS; PERFORMANCE; PHASE SHIFT; PLASMA; PLASMA CONFINEMENT; RF SYSTEMS; STEADY-STATE CONDITIONS

Citation Formats

Kumazawa, R., Mutoh, T., Seki, T., Shimpo, F., Nomura, G., Watari, T., Saito, K., Ido, T., Cattanei, G., and Zhao, Y. Liquid impedance matching system for Ion Cyclotron heating. United States: N. p., 1999. Web. doi:10.1063/1.59757.
Kumazawa, R., Mutoh, T., Seki, T., Shimpo, F., Nomura, G., Watari, T., Saito, K., Ido, T., Cattanei, G., & Zhao, Y. Liquid impedance matching system for Ion Cyclotron heating. United States. doi:10.1063/1.59757.
Kumazawa, R., Mutoh, T., Seki, T., Shimpo, F., Nomura, G., Watari, T., Saito, K., Ido, T., Cattanei, G., and Zhao, Y. Mon . "Liquid impedance matching system for Ion Cyclotron heating". United States. doi:10.1063/1.59757.
@article{osti_21210503,
title = {Liquid impedance matching system for Ion Cyclotron heating},
author = {Kumazawa, R. and Mutoh, T. and Seki, T. and Shimpo, F. and Nomura, G. and Watari, T. and Saito, K. and Ido, T. and Cattanei, G. and Zhao, Y.},
abstractNote = {Ion Cyclotron Range of Frequency (ICRF) heating on the Large Helical Device (LHD) is characterized by high power (up to 12MW) and by steady-state operation (30 minutes). Research and development for ICRF heating have been carried out in recent years. A newly developed liquid stub tuner has demonstrated highly reliable performance as a stub tuner; it has withstood 63kV for 10 seconds and 50kV for 30 minutes. The liquid surface level could be shifted under high RF voltage without breakdown. A liquid impedance matching system has been designed and fabricated for ICRF heating on the LHD. This system consists of a liquid stub tuner and a liquid phase shifter. The liquid phase shifter was constructed by connecting two liquid stub tuners in a U-shaped configuration. An impedance matching can be acquired in a wide frequency range, i.e., 25-95MHz by selecting the length of 4m for the liquid stub tuner. At some frequencies, it was a problem that the RF voltage at the phase shifter became higher than that between the RF antenna and the impedance matching system. However, this difficulty has been resolved by adopting the use of asymmetrical heights of liquid surface levels at the U-shaped liquid phase shifter.},
doi = {10.1063/1.59757},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}