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Comparisons Between Experimental Measurements and
Numerical Simulations of Spheromak Formation in SSPX
C. A. Romero-Talamis* and E. B. Hooper, D. N. Hill,
B. I. Cohen, H. S. McLean, R. D. Wood, J. M. Moller
Lawrence Livermore National Laboratory,
7000 East Avenue, Livermore, California, 94550.t
(Dated: March 15, 2006)
Abstract
Data from a recently installed insertable magnetic probe array in the Sustained Spheromak
Physics Experiment (SSPX) [E. B. Hooper et al., Nucl. Fusion 39, 863 (1999)] is compared
against NIMROD [C. R. Sovinec et al., J. Comp. Phys. 195, 355 (2004)], a full 3D resistive
magnetohydrodynamic code that is used to simulate SSPX plasmas. The experiment probe consists
of a linear array of chip inductors arranged in clusters that are spaced every 2 cm, and spans the
entire machine radius at the flux conserver midplane. Both the experiment and the numerical
simulations show the appearance, shortly after breakdown, of a column with a hollow current profile
that precedes magnetic reconnection, a process essential to the formation of closed magnetic flux
surfaces. However, there are differences between the experiment and the simulation in how the
column evolves after it is formed. These differences are studied to help identify the mechanisms
that eventually lead to closed-flux surfaces (azimuthally averaged) and flux amplification, which
occur in both the experiment and the simulation.
*Electronic address: romerotalamasl@llnl.gov
tThis work performed under the auspices of the USDOE by LLNL under contract 7405-Eng-48.1
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Romero-Talam?s, C. A.; Hooper, E. B.; Hill, D. N.; Cohen, B. I.; McLean, H. S.; Wood, R. D. et al. Comparisons Between Experimental Measurments and Numerical Simulations of Spheromak Formation in SSPX, article, March 15, 2006; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc898830/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.