Role of symmetry-breaking induced by E r × B shear flows on developing residual stresses and intrinsic rotation in the TEXTOR tokamak
Role of symmetry-breaking induced by E r × B shear flows on developing residual stresses and intrinsic rotation in the TEXTOR tokamak
Direct measurements of residual stress (force) have been executed at the edge of the TEXTOR tokamak using multitip Langmuir and Mach probes, together with counter-current NBI torque to balance the existing toroidal rotation. Substantial residual stress and force have been observed at the plasma boun...
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Personal Name(s): | Xu, Y. |
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Hidalgo, C. / Shesterikov, I. / Berte, M. / Dumortier, P. / Van Schoor, M. / Vergote, M. / Krämer-Flecken, A. / Koslowski, Hans Rudolf | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear fusion, 53 (2013) 7, S. 072001 - |
Imprint: |
Vienna
IAEA
2013
|
DOI: |
10.1088/0029-5515/53/7/072001 |
Document Type: |
Journal Article |
Research Program: |
ohne Topic |
Publikationsportal JuSER |
Direct measurements of residual stress (force) have been executed at the edge of the TEXTOR tokamak using multitip Langmuir and Mach probes, together with counter-current NBI torque to balance the existing toroidal rotation. Substantial residual stress and force have been observed at the plasma boundary, confirming the existence of a finite residual stress as possible mechanisms to drive the intrinsic toroidal rotation. In low-density discharges, the residual stress displays a quasi-linear dependence on the local pressure gradient, consistent with theoretical predictions. At high-density shots the residual stress and torque are strongly suppressed. The results show close correlation between the residual stress and the Er × B flow shear rate, suggesting a minimum threshold of the E × B flow shear required for the k∥ symmetry breaking. These findings provide the first experimental evidence of the role of Er × B sheared flows in the development of residual stresses and intrinsic rotation. |