4 papers
Optical analogy for stellarators: Ridges as caustics and coils as singularities
Wrick Sengupta, Stefan Buller, Rogerio Jorge +7
A common feature of most numerically optimized stellarator geometries is the presence of sharp ridges on outer flux surfaces, irrespective of the rotational transform. Despite thei…
How Does The Magnetic Gradient Scale Length Influence Complexity of Filamentary Coils in Stellarators?
John Kappel, Matt Landreman, Philipp Jurašić +1
The distance between the last closed flux surface (LCFS) and the nearest electromagnetic coils is a dominating factor in the cost, size, and engineering difficulty of stellarators.…
A family of quasi-axisymmetric stellarators with varied rotational transform
Stefan Buller, Matt Landreman, John Kappel +1
We apply a continuation method to recently optimized stellarator equilibria with excellent quasi-axisymmetry (QA) to generate new equilibria with a wide range of rotational transfo…
The Magnetic Gradient Scale Length Explains Why Certain Plasmas Require Close External Magnetic Coils
John Kappel, Matt Landreman, Dhairya Malhotra
The separation between the last closed flux surface of a plasma and the external coils that magnetically confine it is a limiting factor in the construction of fusion-capable plasm…