Dynamics of the Disruption Halo Current Toroidal Asymmetry in NSTX

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This paper describes the dynamics of disruption halo current non-axisymmetries in the lower divertor of the National Spherical Torus Experiment [M. Ono, et al. Nuclear Fusion 40, 557 (2000)]. While. The halo currents typically have a strongly asymmetric structure where they enter the divertor floor, and this asymmetry has been observed to complete up to 7 toroidal revolutions over the duration of the halo current pulse. However, the rotation speed and toroidal extend of the asymmetry can vary significantly during the pulse. The rotation speed, halo current pulse duration, and total number of revolutions tend to be smaller in cases ... continued below

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Gerhardt, S.P. September 27, 2012.

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Description

This paper describes the dynamics of disruption halo current non-axisymmetries in the lower divertor of the National Spherical Torus Experiment [M. Ono, et al. Nuclear Fusion 40, 557 (2000)]. While. The halo currents typically have a strongly asymmetric structure where they enter the divertor floor, and this asymmetry has been observed to complete up to 7 toroidal revolutions over the duration of the halo current pulse. However, the rotation speed and toroidal extend of the asymmetry can vary significantly during the pulse. The rotation speed, halo current pulse duration, and total number of revolutions tend to be smaller in cases with large halo currents. The halo current pattern is observed to become toroidally symmetric at the end of the halo current pulse. It is proposed that this symmeterization is due to the loss of most or all of the closed field line geometry in the final phase of the vertical displacement event.

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  • Nuclear Fusion (October 2012)

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  • Report No.: PPPL-4821
  • Grant Number: DE-ACO2-09CH11466
  • DOI: 10.2172/1057022 | External Link
  • Office of Scientific & Technical Information Report Number: 1057022
  • Archival Resource Key: ark:/67531/metadc837815

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  • September 27, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • July 18, 2016, 5:24 p.m.

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Gerhardt, S.P. Dynamics of the Disruption Halo Current Toroidal Asymmetry in NSTX, report, September 27, 2012; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc837815/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.