Effect of changing coil complexity and magnetic boundary accuracy weights on stellarator coil optimization

In the past year, several Stellarator designs have been created with great calculated fast particle confinement when compared with designs of the past. Several magnetic equilibrium have been found which have fast-particle losses below 1.8% which is 18 times lower than a Wendelstein equilibrium. To demonstrate the feasibility of these designs, magnetic coils must be found that both accurately recreate the magnetic boundary and are practical to build. In this work, we optimize and analyze different coil configurations for a Stellarator which uses the quasihelical magnetic geometry in (Landreman & Paul, Phys. Rev. Lett. 128 (2022) 035001). These coils are optimized using the SIMSOPT framework. We observe how the minimization with different weighting of accuracy of magnetic equilibrium reconstruction and various coil complexity metrics affects the number of fast particles lost. We also optimize using weights on the accuracy of the magnetic boundary which differ across the surface. The work outlined could assist in the design of future constructable coil configurations.