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• W2078594803 abstract "We numerically examine the physics of fast flux closure in transient coaxial helicity injection (CHI) experiments in National Spherical Torus Experiment (NSTX). By performing resistive Magnetohydrodynamics (MHD) simulations with poloidal injector coil currents held constant in time, we find that closed flux surfaces are formed through forced magnetic reconnection. Through a local Sweet-Parker type reconnection with an elongated current sheet in the injector region, closed flux surfaces expand in the NSTX global domain. Simulations demonstrate outflows approaching poloidally Alfvénic flows and reconnection times consistent with the Sweet-Parker model. Critical requirements for magnetic reconnection and flux closure are studied in detail. These primary effects, which are magnetic diffusivity, injector flux, injector flux footprint width, and rate of injector voltage reduction, are simulated for transient CHI experiments. The relevant time scales for effective reconnection are τV&lt;τrec≈τAS(1+Pm)1/4&lt;τR, where τV is the time for the injector voltage reduction, τA is the poloidal Alfvén transit time, τR is the global resistive diffusion time, and Pm and S are Prandtl and Lundquist numbers." @default.
• W2078594803 created "2016-06-24" @default.
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• W2078594803 date "2014-05-01" @default.
• W2078594803 modified "2023-10-16" @default.
• W2078594803 title "Physics of forced magnetic reconnection in coaxial helicity injection experiments in National Spherical Torus Experiment" @default.
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• W2078594803 doi "https://doi.org/10.1063/1.4875337" @default.
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