Turbulent momentum transport due to neoclassical flows. (16th October 2015)

• Record Type: Journal Article
• Authors: Lee, Jungpyo; Barnes, Michael; Parra, Felix I; Belli, Emily; Candy, Jeff
• Is Part Of: Plasma physics and controlled fusion. Volume 57:Number 12(2015:Dec.)
• Publication Date: 2015-10-16
• Subjects: tokamak -- turbulence -- rotation -- neoclassical flow; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/0741-3335/57/12/125006
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: Intrinsic toroidal rotation in a tokamak can be driven by turbulent momentum transport due to neoclassical flow effects breaking a symmetry of turbulence. In this paper we categorize the contributions due to neoclassical effects to the turbulent momentum transport, and evaluate each contribution using gyrokinetic simulations. We find that the relative importance of each contribution changes with collisionality. For low collisionality, the dominant contributions come from neoclassical particle and parallel flows. For moderate collisionality, there are non-negligible contributions due to neoclassical poloidal electric field and poloidal gradients of density and temperature, which are not important for low collisionality.