Simultaneous closed-loop control of the current profile and the electron temperature profile in the TCV tokamak

J.E. Barton, W.P. Wehner, E. Schuster, F. Felici, O. Sauter

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Abstract

Two key properties that are often used to define a plasma operating scenario in nuclear fusion tokamak devices are the current and electron temperature (Te) profiles due to their intimate relationship to plasma performance and stability. In the tokamak community, the current profile is typically specified in terms of the safety factor (q) profile or its inverse, the rotational transform (ι = 1/q) profile. The plasma poloidal magnetic flux (Ψ) and Te dynamics are governed by an infinite-dimensional, nonlinear, coupled, physics-based model that is described by the magnetic diffusion equation and the electron heat transport equation. In this work, an integrated feedback controller is designed to track target ι (proportional to the spatial gradient of Ψ) and Te profiles by embedding these partial differential equation models into the control design process. The electron thermal conductivity profile is modeled as an uncertainty, and the controller is designed to be robust to an expected uncertainty range. The performance of the integrated ι + Te profile controller in the TCV tokamak is demonstrated through simulations with the simulation code RAPTOR by first tracking a nominal target, and then modulating the Te profile between equilibrium points while maintaining the ι profile in a stationary condition.

Original languageEnglish
Title of host publicationProceedings of the American Control Conference
PublisherInstitute of Electrical and Electronics Engineers
Pages3316-3321
Number of pages6
ISBN (Print)9781479986842
DOIs
Publication statusPublished - 28 Jul 2015
Event2015 American Control Conference (ACC 2015), July 1–3, 2015, Chicago, IL, USA - Hilton Palmer House, Chicago, IL, United States
Duration: 1 Jul 20153 Jul 2015
http://acc2015.a2c2.org/

Conference

Conference2015 American Control Conference (ACC 2015), July 1–3, 2015, Chicago, IL, USA
Abbreviated titleACC 2015
CountryUnited States
CityChicago, IL
Period1/07/153/07/15
Internet address

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Cite this

Barton, J. E., Wehner, W. P., Schuster, E., Felici, F., & Sauter, O. (2015). Simultaneous closed-loop control of the current profile and the electron temperature profile in the TCV tokamak. In Proceedings of the American Control Conference (pp. 3316-3321). [7171844] Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/ACC.2015.7171844