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NRC nominee Nieh commits to independent safety mission
During a Senate Environment and Public Works Committee hearing today, Ho Nieh, President Donald Trump’s nominee to serve as a commissioner at the Nuclear Regulatory Commission, was urged to maintain the agency’s independence regardless of political pressure from the Trump administration.
V. P. Pastukhov, N. V. Chudin
Fusion Science and Technology | Volume 59 | Number 1 | January 2011 | Pages 84-89
doi.org/10.13182/FST11-A11580
Articles are hosted by Taylor and Francis Online.
Low-frequency quasi-2D plasma convection and the resultant nondiffusive cross-field plasma transport in mirror-based systems are studied by means of direct computer simulations of nonlinear plasma dynamics in a frame of adiabatically reduced one-fluid MHD model. The simulations were performed for axisymmetric or effectively symmetrized paraxial mirror-based systems such as tandem mirror and gas dynamic traps. Various regimes of plasma confinement with sheared plasma rotation were modeled and analyzed. Simulations have shown formation of large-scale flute-like stochastic vortex structures, which are similar to the vortex-like structures observed in GAMMA 10 and GDT experiments. It was shown that a controlled formation of high-vorticity layers allows one to prevent fast plasma degradation and to reduce considerably the nondiffusive cross-field plasma transport even in a presence of unstable pressure driven modes with a weak MHD drive. The effect results from an appreciable nonlinear modification of dominant vortex-like structures due to a competition between pressure driven and Kelvin-Helmholtz instabilities.