A high power experimental traveling wave antenna for fast wave heating and current drive in DIII-D and relevance to ITER

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The impact of a contemplated conversion of the directly driven high power antenna arrays in DIII-D to externally tuned and coupled traveling wave antennas (TWAs) is evaluated based on empirical modeling, computer simulation and low power experiments. A regime of operation is predicted within the TWA passband in which the reflected power from the TWA approaches 0.1% during ELM-free H-mode. Furthermore, this reflected power does not exceed 1% and the optimum phase velocity produced by the TWA decreases less than 5% during ELMs. This resilient operating regime is phase shifted using external tuning stubs, thus providing considerable experimental flexibility. Over ... continued below

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7 p.

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Phelps, D.A.; Ikezi, H. & Moeller, C.P. October 1, 1995.

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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

The impact of a contemplated conversion of the directly driven high power antenna arrays in DIII-D to externally tuned and coupled traveling wave antennas (TWAs) is evaluated based on empirical modeling, computer simulation and low power experiments. A regime of operation is predicted within the TWA passband in which the reflected power from the TWA approaches 0.1% during ELM-free H-mode. Furthermore, this reflected power does not exceed 1% and the optimum phase velocity produced by the TWA decreases less than 5% during ELMs. This resilient operating regime is phase shifted using external tuning stubs, thus providing considerable experimental flexibility. Over 90% plasma coupling efficiency is achieved by recovering the TWA output power using a novel traveling wave recirculator. Combining the above attributes with efficient plasma coupling even at large antenna-plasma distances and the lack of need for dynamic tuning, TWAs appear to offer great promise for ITER.

Physical Description

7 p.

Notes

INIS; OSTI as DE97004213

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  • 16. IEEE/NPSS symposium on fusion engineering, Champaign, IL (United States), 1-5 Oct 1995

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  • Other: DE97004213
  • Report No.: GA--A22159
  • Report No.: CONF-950905--39
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 459433
  • Archival Resource Key: ark:/67531/metadc675617

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  • October 1, 1995

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  • July 25, 2015, 2:21 a.m.

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  • April 18, 2016, 6:06 p.m.

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Phelps, D.A.; Ikezi, H. & Moeller, C.P. A high power experimental traveling wave antenna for fast wave heating and current drive in DIII-D and relevance to ITER, article, October 1, 1995; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc675617/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.