Generalized Boozer coordinates: A natural coordinate system for quasisymmetry

Publication Year
2021

Type

Article
Abstract

We prove the existence of a straight-field-line coordinate system we call generalized Boozer coordinates. This coordinate system exists for magnetic fields with nested toroidal flux surfaces provided ∮d𝑙/𝐵(𝐣·∇𝜓)=0, where symbols have their usual meaning, and the integral is taken along closed magnetic field lines. All quasisymmetric fields, regardless of their associated form of equilibria, must satisfy this condition. This coordinate system presents itself as a convenient form to describe general quasisymmetric configurations and their properties. Insight can be gained analytically into the difference between strong and weak forms of quasisymmetry, as well as axisymmetry, and the interaction of quasisymmetry with different forms of equilibria.

Publication Status
In Press
Journal
Physics of Plasmas
Volume
28
Pages
092510
Date Published
09/2021