Liquid stub tuner for ion cyclotron heating

R. Kumazawa, T. Mutoh, T. Seki, F. Sinpo, G. Nomura, T. Ido, T. Watari, Jean Marie Noterdaeme, Yangping Zhao

Research output: Contribution to journalArticle

Abstract

Ion cyclotron range of frequency (ICRF) heating on the large helical device (LHD) is characterized by high power (up to 12 MW) and steady state operation (30 min). The LHD is a helical device (with a major radius of 3.9 m and a minor radius of 0.6 m) with superconducting coil windings (1=2, m=10). The main purpose of physical research is to investigate currentless and disruption-free plasma. Research and development for steady state ICRF heating has been carried out in recent years: A high rf power transmission system consisting of stub tuners, a ceramic feedthrough, and an ion cyclotron heating loop antenna has been developed. In addition, steady state operation of a rf oscillator has been achieved at a power higher than 1 MW. A liquid stub tuner has been proposed as an innovation. The liquid stub tuner makes use of the difference between the rf wavelengths in liquid and in gas due to the different relative dielectric constants. The liquid stub tuner has been experimentally proved to be a reliable rf component for high power transmission systems. Test results have quantitatively demonstrated that it can be used at high if voltage: 61 kV for 10 s and 50 kV for 30 min. Furthermore, the liquid surface can be shifted under high rf voltage without breakdown, which suggests that it can be employed as a feedback control impedance matching tool to keep reflected rf power at a low level with regard to a temporal variation of plasma loading resistance.

Original languageEnglish
Pages (from-to)2665-2673
Number of pages9
JournalReview of Scientific Instruments
Volume70
Issue number6
DOIs
Publication statusPublished - Jun 1999
Externally publishedYes

Fingerprint

Cyclotrons
cyclotrons
Heating
heating
power transmission
Ions
Liquids
liquids
high voltages
ions
Power transmission
tuners
loop antennas
radii
impedance matching
Tuners
liquid surfaces
Plasmas
Loop antennas
research and development

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Kumazawa, R., Mutoh, T., Seki, T., Sinpo, F., Nomura, G., Ido, T., ... Zhao, Y. (1999). Liquid stub tuner for ion cyclotron heating. Review of Scientific Instruments, 70(6), 2665-2673. https://doi.org/10.1063/1.1149826

Liquid stub tuner for ion cyclotron heating. / Kumazawa, R.; Mutoh, T.; Seki, T.; Sinpo, F.; Nomura, G.; Ido, T.; Watari, T.; Noterdaeme, Jean Marie; Zhao, Yangping.

In: Review of Scientific Instruments, Vol. 70, No. 6, 06.1999, p. 2665-2673.

Research output: Contribution to journalArticle

Kumazawa, R, Mutoh, T, Seki, T, Sinpo, F, Nomura, G, Ido, T, Watari, T, Noterdaeme, JM & Zhao, Y 1999, 'Liquid stub tuner for ion cyclotron heating', Review of Scientific Instruments, vol. 70, no. 6, pp. 2665-2673. https://doi.org/10.1063/1.1149826
Kumazawa R, Mutoh T, Seki T, Sinpo F, Nomura G, Ido T et al. Liquid stub tuner for ion cyclotron heating. Review of Scientific Instruments. 1999 Jun;70(6):2665-2673. https://doi.org/10.1063/1.1149826
Kumazawa, R. ; Mutoh, T. ; Seki, T. ; Sinpo, F. ; Nomura, G. ; Ido, T. ; Watari, T. ; Noterdaeme, Jean Marie ; Zhao, Yangping. / Liquid stub tuner for ion cyclotron heating. In: Review of Scientific Instruments. 1999 ; Vol. 70, No. 6. pp. 2665-2673.
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