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In the Earth magnetosphere, sunspots and magnetic cusp fusion devices, theboundary between the plasma and the magnetic field is marked by a diamagneticcurrent layer with a rapid change in plasma pressure and magnetic fieldstrength. First principles numerical simulations were conducted to investigatethis boundary layer with a spatial resolution beyond electron gyroradius whileincorporating a global equilibrium structure. The boundary layer thickness isdiscovered to be on the order of electron gyroradius scale due to aself-consistent electric field suppressing ion gyromotion at the boundary.Formed at the scale of the electron gyroradius, the electric field plays acritical role in determining equilibrium structure and plasma transport. Thediscovery highlights the necessity to incorporate electron gyroradius scalephysics in studies aimed at advancing our understanding of fusion devices, themagnetosphere and sunspots.

Discovery of an Electron Gyroradius Scale Current Layer Its Relevance to Magnetic Fusion Energy, Earth Magnetosphere and Sunspots