@article{oai:nifs-repository.repo.nii.ac.jp:00010746,
 author = {Chen, Jun and IDA,  Katsumi and YOSHINUMA,  Mikiro and YOSHINUMA,  Mikirou and KOBAYASHI, Tatsuya and MURAKAMI,  Sadayoshi and YAMAMOTO, Yasuhiro and Ye, M.Y and Lyu, B},
 issue = {10},
 journal = {Nuclear Fusion},
 month = {Sep},
 note = {0000-0001-6498-916X, An asymmetric parallel return flow, which modifies the parallel component of the flow, is expected to meet the zero divergence of the flow on a flux surface based on the common neoclassical theory for torus plasma. The full flow structure is measured by charge exchange spectroscopy on the Large Helical Device. Inboard/outboard asymmetry of the parallel flow is observed according to the full flow profile measurement. Flow asymmetry is considered to be induced by the Pfirsch–Schlüter flow closely associated with the radial electric field. A linear relationship between the integrated flow asymmetry and the electric potential difference is obtained in different magnetic fields and configurations. A model based upon the incompressibility of the flow is applied to acquire a geometric factor hB, which only connects to the magnetic configuration from the experiment. The asymmetric component of the parallel flow measured is compared with the asymmetric component of parallel flow calculated in the incompressibility conditions of flow on the magnetic flux surface. The measured asymmetric flow is consistent with the calculation in plasma with a small toroidal torque input in the inward shifted configuration. However, the measured asymmetric flow is significantly smaller than that calculated for plasma with a large toroidal torque or in the outward shifted configuration. One possible explanation for this variation could be radial transport due to anomalous perpendicular viscosity as well as strongly poloidally asymmetric radial flow.},
 title = {Asymmetry of parallel flow on the Large Helical Device},
 volume = {59},
 year = {2019}
}