Dynamics of the Disruption Halo Current Toroidal Asymmetry in NSTX Page: 3 of 28
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Dynamics of the Disruption Halo Current Toroidal Asymmetry in NSTX
S.P. Gerhardt'
1: Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA, 08543
Abstract
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.
Keywords: Disruption, NSTX, Spherical Torus, Halo Currents
PACS numbers: 52.55.Fa
Contents:
7 Sections
14 Figures
70 References
Sections:
1: Introduction and background
2: NSTX device and halo current instrumentation.
3: Observation of halo current rotation in the NSTX divertor
4: Statistical analysis halo current dynamics
5: Effect if n=1 fields on halo current rotation
6: Halo current symmeterization during the late current quench
7: Summary and discussion
This manuscript has been authored by Princeton University under Contract Number DE-AC02-09CH11466
with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting
the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-
up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow
others to do so, for United States Government purposes.S.P. Gerhardt: NSTX Halo Current Asymmetry Dynamics
1
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Gerhardt, S.P. Dynamics of the Disruption Halo Current Toroidal Asymmetry in NSTX, report, September 27, 2012; Princeton, New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc837815/m1/3/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.