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Predictive Modelling of Plasma Rotation (examples from ITPA ITB database)

Predictive Modelling of Plasma Rotation (examples from ITPA ITB database). V.V. Parail 1 T. Tala 2 , A. Becoulet 3 , G. Corrigan 1 ,X. Garbet 3 , D. Heading 1 , X. Litaudon 3 , P.I. Strand 4 and J. Weiland 4

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Predictive Modelling of Plasma Rotation (examples from ITPA ITB database)

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  1. Predictive Modelling of Plasma Rotation (examples from ITPA ITB database) V.V. Parail1T. Tala2, A. Becoulet3, G. Corrigan1,X. Garbet3, D. Heading1, X. Litaudon3, P.I. Strand4 and J. Weiland4 1UKAEA Fusion Association, Culham, UK; 2Association Euratom-Tekes, Finland; 3Association Euratom-CEA, Cadarache, France; 4Chalmers University, Gothenburg, Sweden Selection of shots; Transport models used in simulation Comparative role of plasma rotation and negative/zero magnetic shear in ITB formation; Conclusions and future plans Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  2. Selection of shots • Three pairsof plasmas with ITB from JET, JT-60U and DIII-D (each pair has one shot with and one without negative shear) were used to simulate plasma rotation; • Discharges from JET and DIII-D have tangential NBI injection, which provides adequate torque to generate strong toroidal rotation; • JT-60U uses quasi-perpendicular injection so that toroidal rotation is controlled mainly by neo-classical effects; • Actually JT-60U shots give very good complimentary information about plasma rotation. Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  3. Transport models (1) • JETTO model (Bohm/gyroBohm) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  4. Transport models (2) • Hahm-Burrell formulation of the shearing rate was used in simulations: Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  5. Transport models (3) • Full implementation of Weiland model with off-diagonal elements was used as a second transport model; • Both JETTO and Weiland models were complemented by the full matrix of the neo-classical transport coefficients from NCLASS; • Weiland model uses the same Hahm-Burrell formulation of the shearing rate; • Same assumption was used for anomalous viscosity: Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  6. Results of the modelling (JET) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  7. Results of the modelling (JET) Legend: - - -Experiment __ JETTO, C3=0.9 __ JETTO, C3=1.2; __ Weiland, normal; __ “-” Vtorx5; __ “-” ExBx3 Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  8. Results of the modelling (JET) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  9. Results of the modelling (JET) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  10. Results of the modelling (JET) Legend: - - -Experiment __ JETTO, C3=0.5 __ JETTO, C3=1.5; __ Weiland, normal; __ “-” Vtorx5; __ “-” ExBx5 Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  11. Results of the modelling (JET) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  12. Results of the modelling (JT-60U) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  13. Results of the modelling (JT-60U) Legend: - - -Experiment __ JETTO, C3=1.2 __ Weiland, normal; __ “-” Vtorx3; __ “-” ExBx10 Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  14. Results of the modelling (JT-60U) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  15. Results of the modelling (JT-60U) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  16. Results of the modelling (JT-60U) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  17. Results of the modelling (JT-60U) Legend: - - -Experiment __ JETTO, C3=0.5 __ JETTO, C3=1.2; __ Weiland, normal; __ “-” Vtor; __ “-” ExBx10 Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  18. Results of the modelling (JT-60U) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  19. Results of the modelling (DIII-D) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  20. Results of the modelling (DIII-D) Legend: - - -Experiment __ JETTO, C3=0.5 __ JETTO, C3=1.0; __ Weiland, normal; __ “-” ExBx5 Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  21. Results of the modelling (DIII-D) Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  22. Conclusions (1) • Bohm/GyroBohmmodel reproduces ITBs quite reasonably; • Toroidal rotation is reproduced with • Plasma rotation (both toroidal and poloidal) seems to play a role in ITB formation particularly in discharges without negative magnetic shear; • Bohm/gyroBohm modes tends to over-estimate ITB width in discharges with negative magnetic shear; Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

  23. Conclusions (2) • Weilandmodel reproduces ITBs only if much increased shearing rate (by 3-10 times); • Generally Weiland model reproduces “weak” barrier much better than the “strong” one; • Same conclusion applies with respect to plasma rotation: it is very difficult to reproduce strong barrier; • Although predictive modelling of plasma rotation does add a “degree of freedom” into simulation, generally it affect the result in a predictable way; Transport/ITB IPTA Meeting, St Petersburg, 8-12 April 2003

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