Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV

T.C. Blanken (Corresponding author), F. Felici (Corresponding author), C. Galperti, O. Kudláček, F. Janky, A. Mlynek, L. Giannone, P. T. Lang, W. Treutterer, W.P.M.H. Heemels, M.R. de Baar

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

Real-time plasma electron density profile estimation and control are essential in the operation of future tokamaks. In particular, the robustness against diagnostics failure and disturbances is important for long pulse operation. A model-based approach to profile estimation is implemented on the control systems of ASDEX Upgrade and TCV, which is able to merge information from various diagnostics for both core and edge density, as well as systematically handling diagnostic failure. The model used for profile estimation is employed to tune a feedback controller before an experiment, thereby reducing the experimental time required for tuning. Subsequently, this observer and controller have been employed in scientific experiments on ASDEX Upgrade and TCV. On ASDEX Upgrade, the density profile estimator was used in high-density pellet-fuelled discharges, providing a more reliable real-time estimate of the core density for feedback control than previously achieved. On TCV, in experiments on integrated pressure and safety factor profile control, the density profile estimator and feedback controller provide a constant density despite disturbances from time-varying ECCD power. Additionally, the real-time density profiles provide an essential input for other real-time plasma state estimation codes including Electron Cyclotron ray tracing codes, contributing to a complete real-time estimation of the entire plasma state.

TaalEngels
Artikelnummer111211
Aantal pagina's16
TijdschriftFusion Engineering and Design
Volume147
DOI's
StatusGepubliceerd - 1 okt 2019

Vingerafdruk

Carrier concentration
Plasmas
Controllers
Feedback
Experiments
Safety factor
Cyclotrons
Ray tracing
State estimation
Feedback control
Tuning
Control systems
Electrons

Trefwoorden

    Citeer dit

    Blanken, T.C. ; Felici, F. ; Galperti, C. ; Kudláček, O. ; Janky, F. ; Mlynek, A. ; Giannone, L. ; Lang, P. T. ; Treutterer, W. ; Heemels, W.P.M.H. ; de Baar, M.R./ Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV. In: Fusion Engineering and Design. 2019 ; Vol. 147.
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    title = "Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV",
    abstract = "Real-time plasma electron density profile estimation and control are essential in the operation of future tokamaks. In particular, the robustness against diagnostics failure and disturbances is important for long pulse operation. A model-based approach to profile estimation is implemented on the control systems of ASDEX Upgrade and TCV, which is able to merge information from various diagnostics for both core and edge density, as well as systematically handling diagnostic failure. The model used for profile estimation is employed to tune a feedback controller before an experiment, thereby reducing the experimental time required for tuning. Subsequently, this observer and controller have been employed in scientific experiments on ASDEX Upgrade and TCV. On ASDEX Upgrade, the density profile estimator was used in high-density pellet-fuelled discharges, providing a more reliable real-time estimate of the core density for feedback control than previously achieved. On TCV, in experiments on integrated pressure and safety factor profile control, the density profile estimator and feedback controller provide a constant density despite disturbances from time-varying ECCD power. Additionally, the real-time density profiles provide an essential input for other real-time plasma state estimation codes including Electron Cyclotron ray tracing codes, contributing to a complete real-time estimation of the entire plasma state.",
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    author = "T.C. Blanken and F. Felici and C. Galperti and O. Kudl{\'a}ček and F. Janky and A. Mlynek and L. Giannone and Lang, {P. T.} and W. Treutterer and W.P.M.H. Heemels and {de Baar}, M.R.",
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    Blanken, TC, Felici, F, Galperti, C, Kudláček, O, Janky, F, Mlynek, A, Giannone, L, Lang, PT, Treutterer, W, Heemels, WPMH & de Baar, MR 2019, 'Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV' Fusion Engineering and Design, vol. 147, 111211. DOI: 10.1016/j.fusengdes.2019.05.030

    Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV. / Blanken, T.C. (Corresponding author); Felici, F. (Corresponding author); Galperti, C.; Kudláček, O.; Janky, F.; Mlynek, A.; Giannone, L.; Lang, P. T.; Treutterer, W.; Heemels, W.P.M.H.; de Baar, M.R.

    In: Fusion Engineering and Design, Vol. 147, 111211, 01.10.2019.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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    AB - Real-time plasma electron density profile estimation and control are essential in the operation of future tokamaks. In particular, the robustness against diagnostics failure and disturbances is important for long pulse operation. A model-based approach to profile estimation is implemented on the control systems of ASDEX Upgrade and TCV, which is able to merge information from various diagnostics for both core and edge density, as well as systematically handling diagnostic failure. The model used for profile estimation is employed to tune a feedback controller before an experiment, thereby reducing the experimental time required for tuning. Subsequently, this observer and controller have been employed in scientific experiments on ASDEX Upgrade and TCV. On ASDEX Upgrade, the density profile estimator was used in high-density pellet-fuelled discharges, providing a more reliable real-time estimate of the core density for feedback control than previously achieved. On TCV, in experiments on integrated pressure and safety factor profile control, the density profile estimator and feedback controller provide a constant density despite disturbances from time-varying ECCD power. Additionally, the real-time density profiles provide an essential input for other real-time plasma state estimation codes including Electron Cyclotron ray tracing codes, contributing to a complete real-time estimation of the entire plasma state.

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    Blanken TC, Felici F, Galperti C, Kudláček O, Janky F, Mlynek A et al. Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV. Fusion Engineering and Design. 2019 okt 1;147. 111211. Beschikbaar vanaf, DOI: 10.1016/j.fusengdes.2019.05.030