Fast wave current drive antenna performance on DIII-D

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Fast wave current drive (FWCD) experiments at 60 MHz are being performed on the DIII-D tokamak for the first time in high electron temperature, high {beta} target plasmas. A four-element phased-array antenna is used to launch a directional wave spectrum with the peak n{sub {parallel}} value ({approx equal} 7) optimized for strong single-pass electron absorption due to electron Landau damping. For this experiment, high power FW injection (2 MW) must be accomplished without voltage breakdown in the transmission lines or antenna, and without significant impurity influx. In addition, there is the technological challenge of impedance matching a four-element antenna while ... continued below

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Pages: (5 p)

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Mayberry, M.J.; Pinsker, R.I.; Petty, C.C.; Chiu, S.C.; Jackson, G.L.; Lippmann, S.I. et al. October 1, 1991.

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Description

Fast wave current drive (FWCD) experiments at 60 MHz are being performed on the DIII-D tokamak for the first time in high electron temperature, high {beta} target plasmas. A four-element phased-array antenna is used to launch a directional wave spectrum with the peak n{sub {parallel}} value ({approx equal} 7) optimized for strong single-pass electron absorption due to electron Landau damping. For this experiment, high power FW injection (2 MW) must be accomplished without voltage breakdown in the transmission lines or antenna, and without significant impurity influx. In addition, there is the technological challenge of impedance matching a four-element antenna while maintaining equal currents and the correct phasing (90{degree}) in each of the straps for a directional spectrum. In this paper we describe the performance of the DIII-D FWCD antenna during initial FW electron heating and current drive experiments in terms of these requirements.

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Pages: (5 p)

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OSTI; NTIS; INIS; GPO Dep.

Source

  • 9. topical conference on radio frequency power in plasmas, Charleston, SC (United States), 19-21 Aug 1991

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  • Other: DE92008052
  • Report No.: GA-A-20694
  • Report No.: CONF-910869--27
  • Grant Number: AC03-89ER51114
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5689101
  • Archival Resource Key: ark:/67531/metadc1092442

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  • October 1, 1991

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  • Feb. 10, 2018, 10:06 p.m.

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  • March 6, 2018, 7:33 p.m.

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Mayberry, M.J.; Pinsker, R.I.; Petty, C.C.; Chiu, S.C.; Jackson, G.L.; Lippmann, S.I. et al. Fast wave current drive antenna performance on DIII-D, article, October 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1092442/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.