Center for Momentum Transport and Flow Organization, University of California at San Diego, San Diego, California, USA.
Phys Rev Lett. 2011 Jul 29;107(5):055003. doi: 10.1103/PhysRevLett.107.055003. Epub 2011 Jul 28.
Collisional electron drift wave turbulence generates drift wave packet structures with density and vorticity fluctuations in the central plasma pressure gradient region of a linear plasma device. Tracking these packets reveals that they follow an outward directed spiral-shaped trajectory in the (r,θ) plane, are azimuthally stretched, and develop anisotropy as they approach an axisymmetric, radially sheared azimuthal flow located at the plasma boundary. Nonlinear energy transfer measurements and time-delay analysis confirm that structure absorption amplifies the sheared flow. Similar mechanisms likely operate at the edge of confined toroidal plasmas and should lead to the amplification of sheared flows at the boundary of these devices as well.
碰撞电子漂移波湍流在直线型等离子体装置的中心等离子体压力梯度区域产生具有密度和涡度涨落的漂移波包结构。跟踪这些波包表明，它们在(r,θ)平面中沿着向外的螺旋形轨迹运动，在接近位于等离子体边界的轴对称、径向切向的角向流时被拉伸，并表现出各向异性。非线性能量传递测量和时滞分析证实，结构吸收会放大切向流。类似的机制可能在约束的环形等离子体的边缘起作用，也应该导致这些装置边界处切向流的放大。
