Electrical Testing of the Full-Scale model of the NSTX HHFW Antenna Array

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The 30 MHz high harmonic fast wave (HHFW) antenna array for NSTX consists of 12 current straps, evenly spaced in the toroidal direction. Each pair of straps is connected as a half-wave resonant loop and will be driven by one transmitter, allowing rapid phase shift between transmitters. A decoupling network using shunt stub tuners has been designed to compensate for the mutual inductive coupling between adjacent current straps, effectively isolating the six transmitters from one another. One half of the array, consisting of six full-scale current strap modules, three shunt stub decouplers, and powered by three phase-adjustable rf amplifiers had ... continued below

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4 pages

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Fadnek, A.; Ryan, P.M.; Sparks, D.O.; Swain, D.W. & Wilgen, J.B. April 12, 1999.

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The 30 MHz high harmonic fast wave (HHFW) antenna array for NSTX consists of 12 current straps, evenly spaced in the toroidal direction. Each pair of straps is connected as a half-wave resonant loop and will be driven by one transmitter, allowing rapid phase shift between transmitters. A decoupling network using shunt stub tuners has been designed to compensate for the mutual inductive coupling between adjacent current straps, effectively isolating the six transmitters from one another. One half of the array, consisting of six full-scale current strap modules, three shunt stub decouplers, and powered by three phase-adjustable rf amplifiers had been built for electrical testing at ORNL. Low power testing includes electrical characterization of the straps, operation and performance of the decoupler system, and mapping of the rf fields in three dimensions.

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4 pages

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  • 13th Topical Conference on Applications of Radio Frequency Power to Plasmas, Princeton, NJ, April 12-14, 1999

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  • Other: DE00007628
  • Report No.: ORNL/CP-103347
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 7628
  • Archival Resource Key: ark:/67531/metadc724904

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 12, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 15, 2016, 12:19 p.m.

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Fadnek, A.; Ryan, P.M.; Sparks, D.O.; Swain, D.W. & Wilgen, J.B. Electrical Testing of the Full-Scale model of the NSTX HHFW Antenna Array, article, April 12, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc724904/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.