2012/09/01 by Siming You, Setthivoine You
Engineering · Materials Science · Physics and Astronomy · #Fusion materials and technologies #Helicity #Magnetic confinement fusion research #Particle accelerators and beam dynamics #Particle physics #Physics #astro-ph.SR #physics.plasm-ph
paper · pdf · doi:10.1063/1.4752215
published as Phys. Plasmas 19, 092107 (2012) · 17 pages, 2 figures. To appear in Phys. Plasmas
openalex publication_date 2012/09/01 · arxiv created 2012/09/07 · arxiv updated 2012/09/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The evolution of relative canonical helicity is examined in the two-fluid magnetohydrodynamic formalism. Canonical helicity is defined here as the helicity of the plasma species’ canonical momentum. The species’ canonical helicity are coupled together and can be converted from one into the other while the total gauge-invariant relative canonical helicity remains globally invariant. The conversion is driven by enthalpy differences at a surface common to ion and electron canonical flux tubes. The model provides an explanation for why the threshold for bifurcation in counter-helicity merging depends on the size parameter. The size parameter determines whether magnetic helicity annihilation channels enthalpy into the magnetic flux tube or into the vorticity flow tube components of the canonical flux tube. The transport of relative canonical helicity constrains the interaction between plasma flows and magnetic fields, and provides a more general framework for driving flows and currents from enthalpy or inductive boundary conditions.