Characterization of Disruption Halo Currents in the National Spherical Torus Experiment

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This paper describes the general characteristics of disruptions halo currents in the National Spherical Torus Experiment [M. Ono, et al. Nuclear Fusion 40, 557 (2000)]. The commonly observed types of vertical motion and resulting halo current patterns are described, and it is shown that plasma discharges developing between components can facilitate halo current flow. The halo current fractions and toroidal peaking factors at various locations in the device are presented. The maximum product of these two metrics for localized halo current measurements is always significantly less than the worst-case expectations from conventional aspect ratio tokamaks (which are typically written in ... continued below

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Gerhardt, S. P.; Menard, J.; Sabbagh, S. & Scotti, F. April 25, 2012.

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Description

This paper describes the general characteristics of disruptions halo currents in the National Spherical Torus Experiment [M. Ono, et al. Nuclear Fusion 40, 557 (2000)]. The commonly observed types of vertical motion and resulting halo current patterns are described, and it is shown that plasma discharges developing between components can facilitate halo current flow. The halo current fractions and toroidal peaking factors at various locations in the device are presented. The maximum product of these two metrics for localized halo current measurements is always significantly less than the worst-case expectations from conventional aspect ratio tokamaks (which are typically written in terms of the total halo current). The halo current fraction and impulse is often largest in cases with the fastest plasma current quenches and highest quench rates. The effective duration of the halo current pulse is comparable to or shorter than the plasma current quench time. The largest halo currents have tended to occur in lower β and lower elongation plasmas. The sign of the poloidal halo current is reversed when the toroidal field direction is reversed.

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  • Nuclear Fusion (November 2011)

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  • Report No.: PPPL-4755
  • Grant Number: DE-ACO2-09CH11466
  • DOI: 10.2172/1062645 | External Link
  • Office of Scientific & Technical Information Report Number: 1062645
  • Archival Resource Key: ark:/67531/metadc830379

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  • April 25, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • July 18, 2016, 5:25 p.m.

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Gerhardt, S. P.; Menard, J.; Sabbagh, S. & Scotti, F. Characterization of Disruption Halo Currents in the National Spherical Torus Experiment, report, April 25, 2012; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc830379/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.