First demonstration of a traveling wave antenna in a tokamak and relevance to the JFT-2M combline

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First observations of a traveling wave antenna (TWA) in a tokamak are reported. For a fractional bandwidth ({delta}{omega}/{omega}) of about 20%, TWA experiments using a four-element antenna in DIII-D showed less than 1% reflected power and excellent stability of the phase velocity of the launched wave -- even during giant ELMs. The power radiated into the plasma varied from about 40% during ELM-free H-mode to almost 90% during L-mode and ELMing H-mode. Theoretical modeling validated by these low power observations is used to predict the plasma load resistance of a high power combline being built for JFT-2M.

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4 p.

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Phelps, D.A.; Moeller, C.P.; Ikezi, H. & Chiu, S.C. June 1, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

First observations of a traveling wave antenna (TWA) in a tokamak are reported. For a fractional bandwidth ({delta}{omega}/{omega}) of about 20%, TWA experiments using a four-element antenna in DIII-D showed less than 1% reflected power and excellent stability of the phase velocity of the launched wave -- even during giant ELMs. The power radiated into the plasma varied from about 40% during ELM-free H-mode to almost 90% during L-mode and ELMing H-mode. Theoretical modeling validated by these low power observations is used to predict the plasma load resistance of a high power combline being built for JFT-2M.

Physical Description

4 p.

Notes

INIS; OSTI as DE95015929

Source

  • 11. topical conference on radio frequency in plasmas, Palm Springs, CA (United States), 17-19 May 1995

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  • Other: DE95015929
  • Report No.: GA-A--22051
  • Report No.: CONF-9505105--13
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 100031
  • Archival Resource Key: ark:/67531/metadc626302

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  • June 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 6:04 p.m.

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Phelps, D.A.; Moeller, C.P.; Ikezi, H. & Chiu, S.C. First demonstration of a traveling wave antenna in a tokamak and relevance to the JFT-2M combline, article, June 1, 1995; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc626302/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.