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- W2079088771 abstract "Rotation is favorable for confinement, but a stellarator can rotate at high speeds if and only if it is sufficiently close to quasisymmetry. This article investigates how close it needs to be. For a magnetic field $mathbf{B} = mathbf{B}_0 + alpha mathbf{B}_1$, where $mathbf{B}_0$ is quasisymmetric, $alphamathbf{B}_1$ is a deviation from quasisymmetry, and $alphall 1$, the stellarator can rotate at high velocities if $alpha < epsilon^{1/2}$, with $epsilon$ the ion Larmor radius over the characteristic variation length of $mathbf{B}_0$. The cases in which this result may break down are discussed. If the stellarator is sufficiently quasisymmetric in the above sense, the rotation profile, and equivalently, the long-wavelength radial electric field, are not set neoclassically; instead, they can be affected by turbulent transport. Their computation requires the $O(epsilon^2)$ pieces of both the turbulent and the long-wavelength components of the distribution function. This article contains the first step towards a formulation to calculate the rotation profile by providing the equations determining the long-wavelength components of the $O(epsilon^2)$ pieces." @default.
- W2079088771 created "2016-06-24" @default.
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- W2079088771 date "2013-11-20" @default.
- W2079088771 modified "2023-10-14" @default.
- W2079088771 title "Stellarators close to quasisymmetry" @default.
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- W2079088771 doi "https://doi.org/10.1088/0741-3335/55/12/125014" @default.
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