Edge Minority Heating Experiment in Alcator C-Mod

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An attempt was made to control global plasma confinement in the Alcator C-Mod tokamak by applying ion cyclotron resonance heating (ICRH) power to the plasma edge in order to deliberately create a minority ion tail loss. In theory, an edge fast ion loss could modify the edge electric field and so stabilize the edge turbulence, which might then reduce the H-mode power threshold or improve the H-mode barrier. However, the experimental result was that edge minority heating resulted in no improvement in the edge plasma parameters or global stored energy, at least at power levels of radio-frequency power is less ... continued below

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692 Kilobytes pages

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Zweben, S.J.; Terry, J.L.; Bonoli, P.; Budny, R.; Chang, C.S.; Fiore, C. et al. March 25, 2005.

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Description

An attempt was made to control global plasma confinement in the Alcator C-Mod tokamak by applying ion cyclotron resonance heating (ICRH) power to the plasma edge in order to deliberately create a minority ion tail loss. In theory, an edge fast ion loss could modify the edge electric field and so stabilize the edge turbulence, which might then reduce the H-mode power threshold or improve the H-mode barrier. However, the experimental result was that edge minority heating resulted in no improvement in the edge plasma parameters or global stored energy, at least at power levels of radio-frequency power is less than or equal to 5.5 MW. A preliminary analysis of these results is presented and some ideas for improvement are discussed.

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692 Kilobytes pages

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INIS; OSTI as DE00838133

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  • Other Information: PBD: 25 Mar 2005

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  • Report No.: PPPL-4059
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/838133 | External Link
  • Office of Scientific & Technical Information Report Number: 838133
  • Archival Resource Key: ark:/67531/metadc783247

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Office of Scientific & Technical Information Technical Reports

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  • March 25, 2005

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 5:56 p.m.

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Zweben, S.J.; Terry, J.L.; Bonoli, P.; Budny, R.; Chang, C.S.; Fiore, C. et al. Edge Minority Heating Experiment in Alcator C-Mod, report, March 25, 2005; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc783247/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.