Abstract
This work presents the first imaging of three dimensional ion flows in the boundary plasma of the DIII-D tokamak. The impurity flows become three dimensional due to the presence of large magnetic islands that disturb the plasma pressure balance along magnetic field lines which is observed experimentally and investigated using fluid modeling
Highlights
The flow of charged particles streaming along magnetic field lines is at the heart of particle and energy transport in plasmas ranging from the solar corona to laboratory fusion devices
A mechanism is described whereby counterstreaming ion flows are observed in a laboratory plasma due to the formation of magnetic islands in a tokamak device
While additional momentum loss and a reduced threshold for detachment in island diverted stellarators is beneficial from the perspective of power exhaust, the lack of a high-recycling regime increases the challenge of finding acceptable particle control solutions
Summary
The flow of charged particles streaming along magnetic field lines is at the heart of particle and energy transport in plasmas ranging from the solar corona to laboratory fusion devices. Three-dimensional counterstreaming ion flows have been widely predicted in both stellarator and tokamak magnetic fusion devices where their presence affects neutral particle fueling, momentum transport, main-chamber erosion, and pressure balance [4,5] This can occur around magnetic islands, regions of isolated magnetic flux [6] that. While additional momentum loss and a reduced threshold for detachment in island diverted stellarators is beneficial from the perspective of power exhaust, the lack of a high-recycling regime increases the challenge of finding acceptable particle control solutions Characterization of these flows is challenging due to their inherent 3D nature and often small spatial scales; there have been observations of counterstreaming flows using Mach probes and traditional line-integrated spectroscopy in stellarators [9,10] in addition to the recent coherence. We image fully 3D ion flows in the boundary plasma of a tokamak using resonant magnetic fields to generate the 3D magnetic topology
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