Speaker
Lu Wang
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1087.pdf
Gyrokinetic theory of turbulence-driven intrinsic rotation and intrinsic
current
Lu Wang1, Shuitao Peng1, Wen He1, P. H. Diamond2
1
International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma
Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,
SEEE, Huazhong University of Science and Technology, Wuhan, China
2
University of California at San Diego, California, USA
A new mechanism for turbulent acceleration of parallel rotation in electrostatic ion
temperature gradient (ITG) is discovered from electrostatic gyrokinetic theory [1]. The
turbulent acceleration acts as a local source/sink, which cannot be written as a divergence of the
parallel Reynolds stress. It has different physics from the residual stress, which enters the
rotation equation via its divergence. Via comparison between the cases for ITG and
collisionless trapped electron mode, a possible connection of our theoretical results to the
experimental observations of ECH effects on toroidal core rotation is discussed [2].
Recent experimental results show that the fluid Reynolds stress cannot explain the rotation
profile [3], and kinetic stress can drive parallel rotation [4]. Therefore, we extended our
previous work to electromagnetic turbulence [5]. The quasilinear intrinsic parallel flow drive
including parallel residual stress, kinetic stress, cross Maxwell stress and parallel turbulent
acceleration by electromagnetic ITG turbulence is calculated analytically using
electromagnetic gyrokinetic theory. The possible implications of our results for experimental
observations are discussed [5]. To clarify that turbulent acceleration does not contradict the
momentum conservation, we also present the relationship between turbulent acceleration and
momentum conservation in electromagnetic turbulence [6]. Our ongoing works focus on
intrinsic toroidal rotation by taking toroidal effects into account and intrinsic current drive by
electromagnetic turbulence.
References：
[1] Wang L. and Diamond P.H. 2013 Phys. Rev. Lett. 110 265006
[2] Wang L., Peng S. and Diamond P.H. 2016 Phys. Plasmas 23 042309
[3] Müller S.H. et al 2011 Phys. Plasmas 18 072504
[4] Ding W.X. et al 2013 Phys. Rev. Lett. 110 065008
[5] Peng S., Wang L. and Pan Y. 2017 Nucl. Fusion 57 036003
[6] Peng S. and Wang L. 2017 Phys. Plasmas 24, 012304
