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Measurement of Fluctuation Induced Flow by Multiple Langmuir Probes in the TJ‐IU Torsatron
Author(s) -
Sánchez E.,
Hidalgo C.,
Pedrosa M. A.,
Balbín R.,
van Milligen B.,
Cortes I. García
Publication year - 1998
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.19980380119
Subject(s) - langmuir probe , flow (mathematics) , physics , plasma , mechanics , atomic physics , computational physics , plasma diagnostics , materials science , nuclear physics
The radial profile of the electrostatic Reynolds stress has been measured in the plasma boundary region of the TJ‐IU torsatron using multiple Langmuir electrodes. The experimental set‐up consists of an arrangement of 6 Langmuir probes radially and poloidally separated. The spatial orientation of the Langmuir probe array provides a measurement of radial (Ẽ r ) and poloidal (Ẽ θ )electric field fluctuations in a plasma volume smaller than the typical correlation volume of fluctuations. The measured Reynolds stress (proportional to Ẽ r Ẽ θ )shows a radial variation around the velocity shear location, suggesting that such mechanism can drive poloidal flows in the edge region of the TJ‐IU torsatron.