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Article
Physics, Fluids & Plasmas
D. Panici et al.
Summary: This paper compares two three-dimensional equilibrium codes, VMEC and DESC, and shows that DESC is able to achieve more accurate solutions, especially near the axis. DESC's better agreement with stability metrics and its ability to compute solutions with the same accuracy as VMEC in less time highlight the importance of higher-accuracy equilibria.
JOURNAL OF PLASMA PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Rahul Gaur et al.
Summary: High-power-density tokamaks offer a potential solution to design cost-effective fusion devices. One way to achieve high power density is to operate at a high beta value (the ratio of thermal to magnetic pressure), i.e. beta similar to 1. However, a beta similar to 1 state may be unstable to various pressure- and current-driven instabilities or have unfavourable microstability properties. To explore these possibilities, we generate beta similar to 1 equilibria and investigate their stability.
JOURNAL OF PLASMA PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Rory Conlin et al.
Summary: A new perturbation and continuation method is proposed for computing and analyzing stellarator equilibria. The method is derived from a series expansion about the equilibrium condition and an efficient algorithm for computing solutions to perturbations is developed. It has been implemented in the DESC stellarator equilibrium code and examples demonstrate its use for computing complicated equilibria, perturbing a tokamak into a stellarator, and performing parameter scans in a fraction of the time required for a full solution.
JOURNAL OF PLASMA PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
A. O. Nelson et al.
Summary: Instability to high toroidal mode number ballooning modes is proposed as the primary gradient-limiting mechanism for tokamak equilibria with negative triangularity shaping, preventing access to strong H-mode regimes. Equilibria with negative triangularity are robustly prohibited from accessing the second stability region, suggesting that reactors should maintain L-mode-like operation.
Article
Physics, Fluids & Plasmas
R. Davies et al.
Summary: To be economically competitive, spherical tokamak (ST) power plant designs require a high beta and low turbulent transport. A new approach of negative triangularity reduces transport but closes access to the 'second stability' region. Positive triangularity can avoid the instability region and maintain high beta with flow shear.
PLASMA PHYSICS AND CONTROLLED FUSION
(2022)
Article
Physics, Fluids & Plasmas
Elizabeth J. Paul et al.
Summary: The text discusses the optimization of fixed-boundary stellarator equilibria using adjoint methods, focusing on figures of merit such as rotational transform, magnetic well, and quasi-symmetry. By taking advantage of gradient information, the equilibrium evaluations are significantly reduced, and regularization objectives to prevent self-intersection of the plasma boundary are proposed. Multiple optimized equilibria, including a vacuum field with low magnetic shear, are presented as examples.
JOURNAL OF PLASMA PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
I. J. McKinney et al.
Summary: The Kinetic-ballooning-mode (KBM) turbulence is studied in three magnetic equilibria with small average magnetic shear. The critical value of normalized plasma pressure for the onset of KBM as the dominant instability decreases at low wavenumber but increases with increasing magnetic shear. Despite large KBM growth rates at long wavelengths, saturation of KBM turbulence with higher beta values can reduce heat transport compared to the electrostatic limit.
JOURNAL OF PLASMA PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
S. Saarelma et al.
Summary: Analysis of negative triangularity discharges on DIII-D shows that decreasing the top triangularity restricts access to 2nd stability, coinciding with the suppression of L-H transition. Theoretical analysis indicates that accessing 2nd stability with more negative triangular shape would require unrealistically high pedestal temperature. Additionally, predictions suggest that increasing core pressure in negative triangularity cases does not result in an increase in pedestal height, contrasting with positive triangular shapes.
PLASMA PHYSICS AND CONTROLLED FUSION
(2021)
Article
Physics, Fluids & Plasmas
D. W. Dudt et al.
PHYSICS OF PLASMAS
(2020)
Article
Physics, Fluids & Plasmas
A. Marinoni et al.
PHYSICS OF PLASMAS
(2019)
Article
Physics, Fluids & Plasmas
S. A. Henneberg et al.
Article
Physics, Fluids & Plasmas
K. Aleynikova et al.
JOURNAL OF PLASMA PHYSICS
(2018)
Article
Physics, Fluids & Plasmas
D. A. Gates et al.
Article
Physics, Fluids & Plasmas
P. B. Snyder et al.
Article
Nuclear Science & Technology
G. Y. Fu et al.
FUSION SCIENCE AND TECHNOLOGY
(2007)
Article
Physics, Fluids & Plasmas
MH Redi et al.
PHYSICS OF PLASMAS
(2002)
Article
Physics, Fluids & Plasmas
MC Zarnstorff et al.
PLASMA PHYSICS AND CONTROLLED FUSION
(2001)
Article
Computer Science, Interdisciplinary Applications
R Sanchez et al.
JOURNAL OF COMPUTATIONAL PHYSICS
(2000)
Article
Physics, Fluids & Plasmas
R Sanchez et al.
PLASMA PHYSICS AND CONTROLLED FUSION
(2000)
