Edge density modification with rf on TFTR and DIII-D

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Modification of the electron density profile in front of rf antennas has been observed on TFTR and DIII-D using reflectometers installed in-antenna to ensure localization to the antenna environment. The modification of the edge density gradient has two components: a flattening of the gradient in the private flux zone, and an increase in the edge density inside the last closed flux surface. In general, these modifications result in a significant decrease in the electron density over most of the private flux zone with a sharp rise in the density near the last closed flux surface. Data from TFTR is used ... continued below

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4 p.

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Hanson, G.R.; England, A.C. & Wilgen, J.B. September 1, 1995.

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Modification of the electron density profile in front of rf antennas has been observed on TFTR and DIII-D using reflectometers installed in-antenna to ensure localization to the antenna environment. The modification of the edge density gradient has two components: a flattening of the gradient in the private flux zone, and an increase in the edge density inside the last closed flux surface. In general, these modifications result in a significant decrease in the electron density over most of the private flux zone with a sharp rise in the density near the last closed flux surface. Data from TFTR is used to infer the dependence of this edge modification with antenna strap phasing and rf power. Initial results from DIII-D showing edge modification will also be discussed. Antenna modeling has shown that this modification in the private flux zone has only small effects on the antenna loading and launched spectrum.

Physical Description

4 p.

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INIS; OSTI as DE95017401

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

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  • Other: DE95017401
  • Report No.: CONF-9505105--18
  • Grant Number: AC05-84OR21400;FG03-86ER53225
  • Office of Scientific & Technical Information Report Number: 100280
  • Archival Resource Key: ark:/67531/metadc626066

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  • September 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • May 2, 2016, 3:47 p.m.

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Hanson, G.R.; England, A.C. & Wilgen, J.B. Edge density modification with rf on TFTR and DIII-D, article, September 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc626066/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.