2021/08/31 by Matt Landreman, Elizabeth Paul · 2 citations
Physics and Astronomy · #physics.plasm-ph
paper · pdf · doi:10.1103/physrevlett.128.035001
Version to appear in Physical Review Letters, including new Supplemental Material
arxiv created 2021/11/23 · arxiv updated 2022/02/02
Quasisymmetry is an unusual symmetry that can be present in toroidal magnetic fields, enabling confinement of charged particles and plasma. Here it is shown that both quasi-axisymmetry and quasi-helical symmetry can be achieved to a much higher precision than previously thought over a significant volume, resulting in exceptional confinement. For a 1 Tesla mean field far from axisymmetry (vacuum rotational transform > 0.4), symmetry-breaking mode amplitudes throughout a volume of aspect ratio 6 can be made as small as the typical ∼ 50 μT geomagnetic field.