# A single-field-period quasi-isodynamic stellarator

@inproceedings{Jorge2022ASQ, title={A single-field-period quasi-isodynamic stellarator}, author={Rogerio Jorge and Gabriel G. Plunk and Michael Drevlak and Matt Landreman and J.-F. Lobsien and K. Camacho Mata and Per Helander}, year={2022} }

A single-ﬁeld-period quasi-isodynamic stellarator conﬁguration is presented. This conﬁguration, which resembles a twisted strip, is obtained by the method of direct construction, that is, it is found via an expansion in the distance from the magnetic axis. Its discovery, however, relied on an additional step involving numerical optimization, performed within the space of near-axis conﬁgurations deﬁned by a set of adjustable magnetic-ﬁeld parameters. This optimization, completed in 30 seconds on…

## One Citation

Direct construction of stellarator-symmetric quasi-isodynamic magnetic configurations

- Physics
- 2022

We develop the formalism of the first order near-axis expansion of the MHD equilibrium equations described in Garren & Boozer (1991), Plunk et al. (2019) and Plunk et al. (2021), for the case of a…

## References

SHOWING 1-10 OF 41 REFERENCES

Direct construction of stellarator-symmetric quasi-isodynamic magnetic configurations

- Physics
- 2022

We develop the formalism of the first order near-axis expansion of the MHD equilibrium equations described in Garren & Boozer (1991), Plunk et al. (2019) and Plunk et al. (2021), for the case of a…

The Stellarator Concept

- PhysicsIEEE Transactions on Plasma Science
- 1981

The basic concepts of the controlled thermonuclear program at Project Matterhorn, Princeton University are discussed. In particular, the theory of confinement of a fully ionized gas in the magnetic…

Construction of quasisymmetric stellarators using a direct coordinate approach

- PhysicsNuclear Fusion
- 2020

Optimized stellarator configurations and their analytical properties are obtained using a near-axis expansion approach. Such configurations are associated with good confinement as the guiding center…

Direct construction of optimized stellarator shapes. Part 2. Numerical quasisymmetric solutions

- PhysicsJournal of Plasma Physics
- 2019

Quasisymmetric stellarators are appealing intellectually and as fusion reactor candidates since the guiding-centre particle trajectories and neoclassical transport are isomorphic to those in a…

Direct construction of optimized stellarator shapes. Part 3. Omnigenity near the magnetic axis

- PhysicsJournal of Plasma Physics
- 2019

The condition of omnigenity is investigated, and applied to the near-axis expansion of Garren & Boozer (Phys. Fluids B, vol. 3 (10), 1991a, pp. 2805–2821). Due in part to the particular analyticity…

Stellarator optimization for good magnetic surfaces at the same time as quasisymmetry

- PhysicsPhysics of Plasmas
- 2021

A method is demonstrated to optimize a stellarator’s geometry to eliminate magnetic islands and achieve other desired physics properties at the same time. For many physics quantities that have been…

On the bootstrap current in stellarators and tokamaks

- Physics
- 2011

The expression for the long-mean-free-path limit of the bootstrap current in stellarators is rederived in such a way that the expansion procedure is identical to that used in the corresponding…

Near-axis expansion of stellarator equilibrium at arbitrary order in the distance to the axis

- PhysicsJournal of Plasma Physics
- 2020

A direct construction of equilibrium magnetic fields with toroidal topology at arbitrary order in the distance from the magnetic axis is carried out, yielding an analytical framework able to explore…

Collisionless microinstabilities in stellarators I - analytical theory of trapped-particle modes

- Physics
- 2013

This is the first of two papers about collisionless, electrostatic micro-instabilities in stellarators, with an emphasis on trapped-particle modes. It is found that, in so-called maximum-$J$…

Evaluation of 1/ν neoclassical transport in stellarators

- Physics
- 1999

Using an analytic solution of the kinetic equation in the 1/ν regime, a new formula for the neoclassical transport coefficients is obtained which takes into account all classes of trapped particles.…