Effect of nonaxisymmetric perturbations on the structure of a tokamak poloidal divertor

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The effects of n = 1 nonaxisymmetric perturbations on a tokamak poloidal divertor are described. Despite the existence of a region of chaotic field line trajectories outside the last closed flux surface, the footprint of the trajectories on the divertor plates is found to be largely coherent, forming a spiral structure. At a fixed toroidal angle, the footprint exhibits a bifurcation similar to that seen experimentally on DIII-D. For field errors of the magnitude that exist in present day tokamaks, the width of the nonaxisymmetric structure in the divertor footprint is comparable to the width of the scrape-off layer.

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Pages: (45 p)

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Pomphrey, N. & Reiman, A. February 1, 1992.

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Description

The effects of n = 1 nonaxisymmetric perturbations on a tokamak poloidal divertor are described. Despite the existence of a region of chaotic field line trajectories outside the last closed flux surface, the footprint of the trajectories on the divertor plates is found to be largely coherent, forming a spiral structure. At a fixed toroidal angle, the footprint exhibits a bifurcation similar to that seen experimentally on DIII-D. For field errors of the magnitude that exist in present day tokamaks, the width of the nonaxisymmetric structure in the divertor footprint is comparable to the width of the scrape-off layer.

Physical Description

Pages: (45 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Other: DE92008507
  • Report No.: PPPL-2801
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/5689318 | External Link
  • Office of Scientific & Technical Information Report Number: 5689318
  • Archival Resource Key: ark:/67531/metadc1092786

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • February 1, 1992

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • May 11, 2018, 5:35 p.m.

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Pomphrey, N. & Reiman, A. Effect of nonaxisymmetric perturbations on the structure of a tokamak poloidal divertor, report, February 1, 1992; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1092786/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.