Exploring novel compact quasi-axisymmetric stellarators

TL;DR

This paper introduces the first numerical optimization of a new class of compact quasi-axisymmetric stellarators, demonstrating improved equilibria with potential advantages for fusion energy.

Contribution

It presents the first numerical optimization of compact quasi-axisymmetric stellarators, advancing beyond previous analytical approaches.

Findings

Achieved significantly improved equilibria at aspect ratio < 2.5

Maintained alpha particle confinement at reactor volume

Enhanced magnetohydrodynamic stability and self-consistent plasma current

Abstract

The new class of compact quasi-axisymmetric stellarators with a wide range of field periods offers the unique potential to combine the advantages of the two leading magnetic confinement fusion devices, tokamaks and stellarators. Here we present the first numerical optimization of this class which has so far only been obtained analytically. Our approach finds significantly improved quasi-axisymmetric equilibria at aspect ratio $< 2.5$, resulting in no losses of alpha particles at reactor volume while also satisfying improved magnetohydrodynamic stability and a self-consistent plasma current.