Modelling of hybrid scenario : from present-day experiments towards ITER

X. Litaudon, I. Voitsekhovitch, J.F. Artaud, P. Belo, J.P.S. Bizarro, T.A. Casper, J. Citrin, E. Fable, J. Ferreira, J. Garcia, L. Garzotti, G. Giruzzi, J. Hobirk, G.M.D. Hogeweij, F. Imbeaux, E. Joffrin, F. Koechl, F. Liu, J. Lönnroth, D. MoreauV. Parail, M. Schneider, P.B. Snyder

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Abstract

The 'hybrid' scenario is an attractive operating scenario for ITER since it combines long plasma duration with the reliability of the reference H-mode regime. We review the recent European modelling effort carried out within the Integrated Scenario Modelling group which aims at (i) understanding the underlying physics of the hybrid regime in ASDEX-Upgrade and JET and (ii) extrapolating them towards ITER. JET and ASDEX-Upgrade hybrid scenarios performed under different experimental conditions have been simulated in an interpretative and predictive way in order to address the current profile dynamics and its link with core confinement, the relative importance of magnetic shear, s, and E × B flow shear on the core turbulence, pedestal stability and H–L transition. The correlation of the improved confinement with an increased s/q at outer radii observed in JET and ASDEX-Upgrade discharges is consistent with the predictions based on the GLF23 model applied in the simulations of the ion and electron kinetic profiles. Projections to ITER hybrid scenarios have been carried out focusing on optimization of the heating/current drive schemes to reach and ultimately control the desired plasma equilibrium using ITER actuators. Firstly, access condition to the hybrid-like q-profiles during the current ramp–up phase has been investigated. Secondly, from the interpreted role of the s/q ratio, ITER hybrid scenario flat-top performance has been optimized through tailoring the q-profile shape and pedestal conditions. EPED predictions of pedestal pressure and width have been used as constraints in the interpretative modelling while the core heat transport is predicted by GLF23. Finally, model-based approach for real-time control of advanced tokamak scenarios has been applied to ITER hybrid regime for simultaneous magnetic and kinetic profile control.
Original languageEnglish
Article number073024
Pages (from-to)073024-1/16
Number of pages16
JournalNuclear Fusion
Volume53
Issue number7
DOIs
Publication statusPublished - 2013

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profiles
plasma equilibrium
kinetics
predictions
shear flow
actuators
projection
turbulence
shear
heat
physics
optimization
heating
radii
ions
electrons
simulation

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Litaudon, X., Voitsekhovitch, I., Artaud, J. F., Belo, P., Bizarro, J. P. S., Casper, T. A., ... Snyder, P. B. (2013). Modelling of hybrid scenario : from present-day experiments towards ITER. Nuclear Fusion, 53(7), 073024-1/16. [073024]. https://doi.org/10.1088/0029-5515/53/7/073024
Litaudon, X. ; Voitsekhovitch, I. ; Artaud, J.F. ; Belo, P. ; Bizarro, J.P.S. ; Casper, T.A. ; Citrin, J. ; Fable, E. ; Ferreira, J. ; Garcia, J. ; Garzotti, L. ; Giruzzi, G. ; Hobirk, J. ; Hogeweij, G.M.D. ; Imbeaux, F. ; Joffrin, E. ; Koechl, F. ; Liu, F. ; Lönnroth, J. ; Moreau, D. ; Parail, V. ; Schneider, M. ; Snyder, P.B. / Modelling of hybrid scenario : from present-day experiments towards ITER. In: Nuclear Fusion. 2013 ; Vol. 53, No. 7. pp. 073024-1/16.
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abstract = "The 'hybrid' scenario is an attractive operating scenario for ITER since it combines long plasma duration with the reliability of the reference H-mode regime. We review the recent European modelling effort carried out within the Integrated Scenario Modelling group which aims at (i) understanding the underlying physics of the hybrid regime in ASDEX-Upgrade and JET and (ii) extrapolating them towards ITER. JET and ASDEX-Upgrade hybrid scenarios performed under different experimental conditions have been simulated in an interpretative and predictive way in order to address the current profile dynamics and its link with core confinement, the relative importance of magnetic shear, s, and E × B flow shear on the core turbulence, pedestal stability and H–L transition. The correlation of the improved confinement with an increased s/q at outer radii observed in JET and ASDEX-Upgrade discharges is consistent with the predictions based on the GLF23 model applied in the simulations of the ion and electron kinetic profiles. Projections to ITER hybrid scenarios have been carried out focusing on optimization of the heating/current drive schemes to reach and ultimately control the desired plasma equilibrium using ITER actuators. Firstly, access condition to the hybrid-like q-profiles during the current ramp–up phase has been investigated. Secondly, from the interpreted role of the s/q ratio, ITER hybrid scenario flat-top performance has been optimized through tailoring the q-profile shape and pedestal conditions. EPED predictions of pedestal pressure and width have been used as constraints in the interpretative modelling while the core heat transport is predicted by GLF23. Finally, model-based approach for real-time control of advanced tokamak scenarios has been applied to ITER hybrid regime for simultaneous magnetic and kinetic profile control.",
author = "X. Litaudon and I. Voitsekhovitch and J.F. Artaud and P. Belo and J.P.S. Bizarro and T.A. Casper and J. Citrin and E. Fable and J. Ferreira and J. Garcia and L. Garzotti and G. Giruzzi and J. Hobirk and G.M.D. Hogeweij and F. Imbeaux and E. Joffrin and F. Koechl and F. Liu and J. L{\"o}nnroth and D. Moreau and V. Parail and M. Schneider and P.B. Snyder",
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Litaudon, X, Voitsekhovitch, I, Artaud, JF, Belo, P, Bizarro, JPS, Casper, TA, Citrin, J, Fable, E, Ferreira, J, Garcia, J, Garzotti, L, Giruzzi, G, Hobirk, J, Hogeweij, GMD, Imbeaux, F, Joffrin, E, Koechl, F, Liu, F, Lönnroth, J, Moreau, D, Parail, V, Schneider, M & Snyder, PB 2013, 'Modelling of hybrid scenario : from present-day experiments towards ITER', Nuclear Fusion, vol. 53, no. 7, 073024, pp. 073024-1/16. https://doi.org/10.1088/0029-5515/53/7/073024

Modelling of hybrid scenario : from present-day experiments towards ITER. / Litaudon, X.; Voitsekhovitch, I.; Artaud, J.F.; Belo, P.; Bizarro, J.P.S.; Casper, T.A.; Citrin, J.; Fable, E.; Ferreira, J.; Garcia, J.; Garzotti, L.; Giruzzi, G.; Hobirk, J.; Hogeweij, G.M.D.; Imbeaux, F.; Joffrin, E.; Koechl, F.; Liu, F.; Lönnroth, J.; Moreau, D.; Parail, V.; Schneider, M.; Snyder, P.B.

In: Nuclear Fusion, Vol. 53, No. 7, 073024, 2013, p. 073024-1/16.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Modelling of hybrid scenario : from present-day experiments towards ITER

AU - Litaudon, X.

AU - Voitsekhovitch, I.

AU - Artaud, J.F.

AU - Belo, P.

AU - Bizarro, J.P.S.

AU - Casper, T.A.

AU - Citrin, J.

AU - Fable, E.

AU - Ferreira, J.

AU - Garcia, J.

AU - Garzotti, L.

AU - Giruzzi, G.

AU - Hobirk, J.

AU - Hogeweij, G.M.D.

AU - Imbeaux, F.

AU - Joffrin, E.

AU - Koechl, F.

AU - Liu, F.

AU - Lönnroth, J.

AU - Moreau, D.

AU - Parail, V.

AU - Schneider, M.

AU - Snyder, P.B.

PY - 2013

Y1 - 2013

N2 - The 'hybrid' scenario is an attractive operating scenario for ITER since it combines long plasma duration with the reliability of the reference H-mode regime. We review the recent European modelling effort carried out within the Integrated Scenario Modelling group which aims at (i) understanding the underlying physics of the hybrid regime in ASDEX-Upgrade and JET and (ii) extrapolating them towards ITER. JET and ASDEX-Upgrade hybrid scenarios performed under different experimental conditions have been simulated in an interpretative and predictive way in order to address the current profile dynamics and its link with core confinement, the relative importance of magnetic shear, s, and E × B flow shear on the core turbulence, pedestal stability and H–L transition. The correlation of the improved confinement with an increased s/q at outer radii observed in JET and ASDEX-Upgrade discharges is consistent with the predictions based on the GLF23 model applied in the simulations of the ion and electron kinetic profiles. Projections to ITER hybrid scenarios have been carried out focusing on optimization of the heating/current drive schemes to reach and ultimately control the desired plasma equilibrium using ITER actuators. Firstly, access condition to the hybrid-like q-profiles during the current ramp–up phase has been investigated. Secondly, from the interpreted role of the s/q ratio, ITER hybrid scenario flat-top performance has been optimized through tailoring the q-profile shape and pedestal conditions. EPED predictions of pedestal pressure and width have been used as constraints in the interpretative modelling while the core heat transport is predicted by GLF23. Finally, model-based approach for real-time control of advanced tokamak scenarios has been applied to ITER hybrid regime for simultaneous magnetic and kinetic profile control.

AB - The 'hybrid' scenario is an attractive operating scenario for ITER since it combines long plasma duration with the reliability of the reference H-mode regime. We review the recent European modelling effort carried out within the Integrated Scenario Modelling group which aims at (i) understanding the underlying physics of the hybrid regime in ASDEX-Upgrade and JET and (ii) extrapolating them towards ITER. JET and ASDEX-Upgrade hybrid scenarios performed under different experimental conditions have been simulated in an interpretative and predictive way in order to address the current profile dynamics and its link with core confinement, the relative importance of magnetic shear, s, and E × B flow shear on the core turbulence, pedestal stability and H–L transition. The correlation of the improved confinement with an increased s/q at outer radii observed in JET and ASDEX-Upgrade discharges is consistent with the predictions based on the GLF23 model applied in the simulations of the ion and electron kinetic profiles. Projections to ITER hybrid scenarios have been carried out focusing on optimization of the heating/current drive schemes to reach and ultimately control the desired plasma equilibrium using ITER actuators. Firstly, access condition to the hybrid-like q-profiles during the current ramp–up phase has been investigated. Secondly, from the interpreted role of the s/q ratio, ITER hybrid scenario flat-top performance has been optimized through tailoring the q-profile shape and pedestal conditions. EPED predictions of pedestal pressure and width have been used as constraints in the interpretative modelling while the core heat transport is predicted by GLF23. Finally, model-based approach for real-time control of advanced tokamak scenarios has been applied to ITER hybrid regime for simultaneous magnetic and kinetic profile control.

U2 - 10.1088/0029-5515/53/7/073024

DO - 10.1088/0029-5515/53/7/073024

M3 - Article

VL - 53

SP - 073024-1/16

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

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M1 - 073024

ER -

Litaudon X, Voitsekhovitch I, Artaud JF, Belo P, Bizarro JPS, Casper TA et al. Modelling of hybrid scenario : from present-day experiments towards ITER. Nuclear Fusion. 2013;53(7):073024-1/16. 073024. https://doi.org/10.1088/0029-5515/53/7/073024