# Geometric concepts for stellarator permanent magnet arrays

@article{Hammond2020GeometricCF, title={Geometric concepts for stellarator permanent magnet arrays}, author={K C Hammond and C. Zhu and Thomas Brown and Keith Corrigan and D.A. Gates and M. J. Sibilia}, journal={Nuclear Fusion}, year={2020}, volume={60} }

The development of stellarators that use permanent magnet arrays to shape their confining magnetic fields has been a topic of recent interest, but the requirements for how such magnets must be shaped, manufactured, and assembled remain to be determined. To address these open questions, we have performed a study of geometric concepts for magnet arrays with the aid of the newly developed Magpie code. A proposed experiment similar to the National Compact Stellarator Experiment (NCSX) is used as a…

## 8 Citations

### Calculation of permanent magnet arrangements for stellarators: a linear least-squares method

- Physics, Geology
- 2020

A problem arising in several engineering areas is to design magnets outside a volume that produce a desired magnetic field inside it. One instance of this problem is stellarator design, where it has…

### PM4Stell: A prototype permanent magnet stellarator structure

- Physics, GeologyPhysics of Plasmas
- 2022

Permanent magnets provide a possible solution to simplify complicated stellarator coils. A prototype permanent magnet stellarator structure, PM4Stell, has been funded to demonstrate the technical…

### On the interaction between the island divertor heat fluxes, the scrape-off layer radial electric field and the edge turbulence in Wendelstein 7-X plasmas

- Physics
- 2022

The formation of the radial electric ﬁeld, E r in the SOL has been experimentally studied for attached divertor conditions in stellarator W7-X. The main objective of this study is to test the…

### Permanent-Magnet Optimization for Stellarators as Sparse Regression

- Physics, Computer SciencePhysical Review Applied
- 2022

An algorithm is proposed that generates sparse solutions that are independent of the initial guess, explicitly enforces maximum strengths for the permanent magnets, and accurately produces the desired magnetic ﬁeld.

### Design of an arrangement of cubic magnets for a quasi-axisymmetric stellarator experiment

- PhysicsNuclear Fusion
- 2022

The usage of permanent magnets to shape the confining magnetic field of a stellarator has the potential to reduce or eliminate the need for non-planar coils. As a proof-of-concept for this idea, we…

### Deep neural-network based optimization for the design of a multi-element surface magnet for MRI applications

- Computer ScienceInverse problems
- 2022

This work presents a combination of a CNN-based encoder with an analytical forward map for solving inverse problems and shows that the model can outperform the benchmark genetic algorithm model currently used for magnet design in MRI, obtaining almost 10 times better results.

### Design of quasi-axisymmetric stellarators with variable-thickness perpendicular permanent magnets based on a two-step magnet design strategy

- Physics
- 2021

A new method for designing stellarators with variable-thickness perpendicular permanent magnets has been developed, based on a two-step magnet design strategy that we previously proposed for…

### Design of quasi-axisymmetric stellarators with varying-thickness permanent magnets based on Fourier and surface magnetic charges method

- Physics
- 2020

To obtain engineering-feasible designs of stellarators with permanent magnets and simplified coils, a new algorithm has been developed based on Fourier decomposition and surface magnetic charges…

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