Since 18 of December 2019 conferences.iaea.org uses Nucleus credentials. Visit our help pages for information on how to Register and Sign-in using Nucleus.
Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Coupling between Intrinsic Rotation and Turbulence-Driven Residual Stress in the TEXTOR Tokamak

Oct 17, 2014, 2:00 PM
4h 45m
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 8

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.
Paper Number EX/P8-18
Country or International Organisation China

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)

Presentation materials