Edge Localized Mode Dynamics and Transport in the Scrape-Off Layer of the DIII-D Tokamak Metadata

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Title

  • Main Title Edge Localized Mode Dynamics and Transport in the Scrape-Off Layer of the DIII-D Tokamak

Creator

  • Author: Boedo, J. A.
    Creator Type: Personal
  • Author: Rudakov, D. L.
    Creator Type: Personal
  • Author: Hollmann, E.
    Creator Type: Personal
  • Author: Gray, D. S.
    Creator Type: Personal
  • Author: Burrell, K. H.
    Creator Type: Personal
  • Author: Moyer, R. A.
    Creator Type: Personal
  • Author: McKee, G. R.
    Creator Type: Personal
  • Author: Fonck, R.
    Creator Type: Personal
  • Author: Stangeby, P. C.
    Creator Type: Personal
  • Author: Evans, T. E.
    Creator Type: Personal
  • Author: Snyder, P. B.
    Creator Type: Personal
  • Author: Leonard, A. W.
    Creator Type: Personal
  • Author: Mahdavi, M. A.
    Creator Type: Personal
  • Author: Schaffer, M. J.
    Creator Type: Personal
  • Author: West, W. P.
    Creator Type: Personal
  • Author: Fenstermacher, M. E.
    Creator Type: Personal
  • Author: Groth, M.
    Creator Type: Personal
  • Author: Allen, S. L.
    Creator Type: Personal
  • Author: Porter, G. D.
    Creator Type: Personal
  • Author: Wolf, N. S.
    Creator Type: Personal
  • Author: Colchin, R. J.
    Creator Type: Personal
  • Author: Zeng, L.
    Creator Type: Personal
  • Author: Wang, G.
    Creator Type: Personal
  • Author: Watkins, J. G.
    Creator Type: Personal
  • Author: Takahashi, T.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: Livermore, California
    Additional Info: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Date

  • Creation: 2004-12-03

Language

  • English

Description

  • Content Description: High temporal and spatial resolution measurements in the boundary of the DIII-D tokamak show that edge localized modes (ELMs) are produced in the low field side, are poloidally localized and are composed of fast bursts ({approx}20 to 40 {micro}s long) of hot, dense plasma on a background of less dense, colder plasma ({approx}5 x 10{sup 18} m{sup {+-}3}, 50 eV) possibly created by the bursts themselves. The ELMs travel radially in the scrapeoff layer (SOL), starting at the separatrix at {approx}450 m/s, and slow down to {approx}150 m/s near the wall, convecting particles and energy to the SOL and walls. The temperature and density in the ELM plasma initially correspond to those at the top of the density pedestal but quickly decay with radius in the SOL. The temperature decay length ({approx}1.2 to 1.5 cm) is much shorter than the density decay length ({approx}3 to 8 cm), and the latter decreases with increasing pedestal (and SOL) density. The local particle and energy flux at the midplane wall during the bursts are 10% to 50% ({approx}1 to 2 x 10{sup 21} m{sup {+-}2} s{sup {+-}1}) and 1% to 2 % ({approx}20 to 30 kW/m{sup 2}) respectively of the LCFS average fluxes, indicating that particles are transported radially much more efficiently than heat. Evidence is presented suggesting toroidal rotation of the ELM plasma in the SOL. The ELM plasma density and temperature increase linearly with discharge/pedestal density up to a Greenwald fraction of {approx}0.6, and then decrease resulting in more benign (grassier) ELMs.
  • Physical Description: PDF-file: 44 pages; size: 0 Kbytes

Subject

  • Keyword: Decay
  • STI Subject Categories: 70 Plasma Physics And Fusion Technology
  • Keyword: Doublet-3 Device
  • Keyword: Transport
  • Keyword: Plasma Density
  • Keyword: Edge Localized Modes
  • Keyword: Rotation
  • Keyword: Sols
  • Keyword: Plasma
  • Keyword: Spatial Resolution

Source

  • Journal Name: Physics of Plasmas; Journal Volume: 12; Journal Issue: 7

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: UCRL-JRNL-208429
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 884786
  • Archival Resource Key: ark:/67531/metadc892462
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