Speaker
Prof.
Yuhong Xu
(Southwestern Institute of Physics)
Description
Direct measurements of residual stress (force) have been executed at the edge of the TEXTOR tokamak using multi-tip 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 ErxB flow shear required for the k// symmetry breaking. These findings provide the first experimental evidence of the role of ErxB sheared flows in the development of residual stresses and intrinsic rotation.
| Country or International Organisation | China |
|---|---|
| Paper Number | EX/P8-18 |
Primary author
Prof.
Yuhong Xu
(Southwestern Institute of Physics)
Co-authors
Dr
Andreas Krämer-Flecken
(Institute of Energy and Climate Research - Plasma Physics, Germany)
Dr
Carlos Hidalgo
(CIEMAT)
Dr
Ilya Shesterikov
(ERM/KMS, Belgium)
Dr
Maarten Vergote
(ERM/KMS, Belgium)
Prof.
Michael Van Schoor
(ERM/KMS,Belgium)
Mr
Michel Berte
(ERM/KMS,Belgium)
Mr
Pierre DUMORTIER
(LPP-ERM/KMS)
Dr
Rudi Koslowski
(Institute of Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich, Germany)
