Stellarator bootstrap current and plasma flow velocity at low collisionality

Abstract

The bootstrap current and flow velocity of a low-collisionality stellarator plasma are calculated. As far as possible, the analysis is carried out in a uniform way across all low-collisionality regimes in general stellarator geometry, assuming only that the confinement is good enough that the plasma is approximately in local thermodynamic equilibrium. It is found that conventional expressions for the ion flow speed and bootstrap current in the low-collisionality limit are accurate only in the $1/\nu$-collisionality regime and need to be modified in the $\sqrt{\nu }$-regime. The correction due to finite collisionality is also discussed and is found to scale as ${\nu }^{2/5}$.

References in corpus (4)

• The effect of tangential drifts on neoclassical transport in stellarators close to omnigeneity
• Less constrained omnigeneous stellarators
• Optimizing stellarators for large flows
• Flow damping in stellarators close to quasisymmetry

Cited by in corpus (8)

• Stellarator impurity flux driven by electric fields tangent to magnetic surfaces
• Physics design point of high-field stellarator reactors
• Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma
• Collisional transport of impurities with flux-surface varying density in stellarators
• An adjoint method for neoclassical stellarator optimization
• Impact of main ion pressure anisotropy on stellarator impurity transport
• MONKES: a fast neoclassical code for the evaluation of monoenergetic transport coefficients
• Optimization of quasisymmetric stellarators with self-consistent bootstrap current and energetic particle confinement