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Discussion on momentum transport in tokamak and helical plasmas

How much do we understand the non-diffusive term of momentum transport?. 1 Driving term Although this term can not be written with simple formula, how can we express this term in experiment?. Discussion on momentum transport in tokamak and helical plasmas. X ２ ∝ (r/a)V f X ２ ∝ ∇T i

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Discussion on momentum transport in tokamak and helical plasmas

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  1. How much do we understand the non-diffusive term of momentum transport? 1 Driving term Although this term can not be written with simple formula, how can we express this term in experiment? Discussion on momentum transport in tokamak and helical plasmas X２∝ (r/a)Vf X２∝ ∇Ti X２∝ ∇pi X２∝ Er X２∝∇ Er 2 Role of Er shear What is the role of Er shear for driving the intrinsic rotation? The intrinsic rotation should be large at the pedestal in the H-mode? Vf Ti

  2. 3 bifurcation Is there theory for the bifurcation in magnitude of intrinsic rotation? ∇V ∇T 4 Causality of rotation flip Although there are experimental results that suggest the connection between the direction of flow and type of turbulence (such as ITG or ETG), causality is verified? Turbulence transition Co-rotation Co-rotation ctr-rotation ctr-rotation Turbulence transition

  3. 5 Angular Momentum conservation Real test for the VTEP model is experimental test of angular Momentum conservation core edge edge core 6 Boundary condition In order to drive rotation, the angular momentum should be released from the system through LCFS edge edge SOL SOL LCFS LCFS

  4. 7 For future research of momentum transport Where? ITB region H-mode pedestal SOL What should be measured? Rotation shear Er shear Turbulence When? Rotation flip H-mode transition Limit cycle oscillation

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