Development of fast wave systems tolerant of time-varying loading

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A new approach to fast wave antenna array design based on the traveling wave antenna has been successfully demonstrated on the JFT-2M tokamak. A traveling wave antenna is powered though a single feed and the power flow from element to element is only via mutual reactive coupling. A combine is a particular type of traveling wave antenna, in which only the fed element and the element at the downstream end of the array are connected to vacuum feed troughs, while the intermediate elements are terminated with reactances inside the vacuum chamber. A twelve element combine for operation at 200 MHz ... continued below

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7 p.

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Pinsker, R.I.; Moeller, C.P.; Petty, C.C. & Phelps, D.A. June 1, 1996.

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Description

A new approach to fast wave antenna array design based on the traveling wave antenna has been successfully demonstrated on the JFT-2M tokamak. A traveling wave antenna is powered though a single feed and the power flow from element to element is only via mutual reactive coupling. A combine is a particular type of traveling wave antenna, in which only the fed element and the element at the downstream end of the array are connected to vacuum feed troughs, while the intermediate elements are terminated with reactances inside the vacuum chamber. A twelve element combine for operation at 200 MHz was designed and fabricated at General Atomics, and installed and operated on the JFT-2M tokamak. The full output power of a single transmitter, 0.2 MW, was coupled to tokamak discharges with very little conditioning required. The input impedance of the combine was well matched to the transmission line impedance for all loading conditions, including vacuum (no plasma), Taylor discharge cleaning plasmas, and ohmic, L- and H-mode tokamak discharges with neutral beam heating without any adjustment of tuning elements.

Physical Description

7 p.

Notes

INIS; OSTI as DE97003326

Source

  • SOFT `96: 19. symposium on fusion technology, Lisbon (Portugal), 16-20 Sep 1996

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  • Other: DE97003326
  • Report No.: GA--A22450
  • Report No.: CONF-960944--10
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 442161
  • Archival Resource Key: ark:/67531/metadc676407

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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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  • June 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 4, 2015, 4:20 p.m.

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Pinsker, R.I.; Moeller, C.P.; Petty, C.C. & Phelps, D.A. Development of fast wave systems tolerant of time-varying loading, article, June 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc676407/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.