Designing A Buildable Optimized Stellarator to Confine Electron-Positron Plasmas

TL;DR

This paper presents a novel design for an optimized stellarator device that effectively confines electron-positron plasmas, utilizing advanced optimization tools to meet engineering and confinement criteria for multiple configurations.

Contribution

It introduces a comprehensive design methodology for a buildable stellarator with optimized plasma equilibrium and coil configurations using new stellarator optimization techniques.

Findings

Achieved satisfactory quasisymmetry and robustness in design.

Met engineering requirements for eight candidate configurations.

Identified the best EPOS candidate with optimized plasma parameters.

Abstract

In this paper, the design of the the plasma equilibrium and superconducting coils for the Electrons and Positrons in an Optimized Stellarator EPOS experiment is presented. With newly developed stellarator optimization tools, including single-stage and stochastic optimization, as well as HTS strain, this work demonstrates that it is possible to achieve key metrics for the buildability and confinement properties of the device. In particular, satisfactory quality of quasisymmetry and stellarator robustness is designed, and engineering requirements are met for eight different candidates. A feasibility study is presented that optimizes multiple candidates for different plasma major radii and coil currents, as well as the best EPOS candidate to date.