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Intrinsic rotation drive by collisionless trapped electron mode turbulence
Plasma Physics · Submitted 8 Apr 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This may induce intrinsic counter-current rotation or flattening of the co-current rotation profile.
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The abstract, sentence by sentence
Both the parallel residual stress and parallel turbulent acceleration driven by electrostatic collisionsless trapped electron mode (CTEM) turbulence are calculated analytically using gyrokinetic theory. Quasilinear results show that the parallel residual stress contributes an outward flux of co-current rotation for normal magnetic shear and turbulence intensity profile increasing outward. This may induce intrinsic counter-current rotation or flattening of the co-current rotation profile. The parallel turbulent acceleration driven by CTEM turbulence vanishes, due to the absence of a phase shift between density fluctuation and ion pressure fluctuation. This is different from the case of ion temperature gradient (ITG) turbulence, for which the turbulent acceleration can provide co-current drive for normal magnetic shear and turbulence intensity profile increasing outward. Its order of magnitude is predicted to be the same as that of the divergence of the residual stress [Lu Wang and P.H. Diamond, Phys. Rev. Lett. {\bf 110}, 265006 (2013)]. A possible connection of these theoretical results to experimental observations of electron cyclotron heating effects on toroidal rotation is discussed.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Both the parallel residual stress and parallel turbulent acceleration driven by electrostatic collisionsless trapped electron mode (CTEM) turbulence are calculated analytically using gyrokinetic theory. | method 0.52 | 0.92 | 0.10 | asserted 1.00 |
| s1 | Quasilinear results show that the parallel residual stress contributes an outward flux of co-current rotation for normal magnetic shear and turbulence intensity profile increasing outward. | result 1.00 | 0.87 | 0.27 | asserted 1.00 |
| s2 | This may induce intrinsic counter-current rotation or flattening of the co-current rotation profile. | interpretation 0.98 | 0.67 | 0.19 | hedged possibility 1.00 |
| s3 | The parallel turbulent acceleration driven by CTEM turbulence vanishes, due to the absence of a phase shift between density fluctuation and ion pressure fluctuation. | result 1.00 | 0.86 | 0.22 | asserted 1.00 |
| s4 | This is different from the case of ion temperature gradient (ITG) turbulence, for which the turbulent acceleration can provide co-current drive for normal magnetic shear and turbulence intensity profile increasing outward. | result 0.63 | 0.51 | 0.17 | asserted 1.00 |
| s5 | Its order of magnitude is predicted to be the same as that of the divergence of the residual stress [Lu Wang and P.H. | result 0.93 | 0.62 | 0.08 | asserted 0.68 |
| s6 | Diamond, Phys. Rev. Lett. {\bf 110}, 265006 (2013)]. | background 0.70 | 0.05 | 0.02 | unclear 0.85 |
| s7 | A possible connection of these theoretical results to experimental observations of electron cyclotron heating effects on toroidal rotation is discussed. | interpretation 0.96 | 0.43 | 0.04 | hedged possibility 0.95 |
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Original abstract
Both the parallel residual stress and parallel turbulent acceleration driven by electrostatic collisionsless trapped electron mode (CTEM) turbulence are calculated analytically using gyrokinetic theory. Quasilinear results show that the parallel residual stress contributes an outward flux of co-current rotation for normal magnetic shear and turbulence intensity profile increasing outward. This may induce intrinsic counter-current rotation or flattening of the co-current rotation profile. The parallel turbulent acceleration driven by CTEM turbulence vanishes, due to the absence of a phase shift between density fluctuation and ion pressure fluctuation. This is different from the case of ion temperature gradient (ITG) turbulence, for which the turbulent acceleration can provide co-current drive for normal magnetic shear and turbulence intensity profile increasing outward. Its order of magnitude is predicted to be the same as that of the divergence of the residual stress [Lu Wang and P.H. Diamond, Phys. Rev. Lett. {\bf 110}, 265006 (2013)]. A possible connection of these theoretical results to experimental observations of electron cyclotron heating effects on toroidal rotation is discussed.
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