Update on the design of the Columbia Stellarator eXperiment

TL;DR

This paper presents the final design configuration for the Columbia Stellarator eXperiment, including coil effects, sensitivity, and physics analysis, confirming its suitability for experimental goals.

Contribution

It provides the detailed final configuration of CSX, building on previous optimization work and validating its feasibility through comprehensive physics and engineering analyses.

Findings

Configuration satisfies all design constraints

Coil effects and sensitivities analyzed and accounted for

Physics properties confirm experimental viability

Abstract

We present the final configuration chosen to be build for the Columbia Stellarator eXperiment (CSX), a new stellartor experiment at Columbia University. In a recent publication, Baillod et al. (NF, 2025) discussed in detail the different objectives, constraints, and optimization algorithms used to find an optimal configuration for CSX. In this paper, we build upon this first publication and find a configuration that satisfies all the constraints. We describe this final configuration including discussion of the coil finite build effects, sensitivity analyses, and the plasma neoclassical physics properties using the SFINCS code. These post-processing calculations provide a confirmation that the experimental goals of CSX can be achieved with the presented configuration.