NDLI: Plasma boundary control in tokamaks

Content Provider	IEEE Xplore Digital Library
Author	Portone, A. Albert, D.
Copyright Year	2003
Description	Author affiliation: EFDA-CSU, Max-Planck-Inst. fur Plasmaphys., Garching, Germany (Portone, A.)
Abstract	Plasma MHD equilibrium and stability play a key role in tokamak engineering since they have far reaching consequences in the design and operation of present and future fusion devices. Here the problem of the control of the plasma boundary is addressed and solved by a two-steps procedure. Firstly the fixed plasma equilibrium problem is solved inside a pre-assigned region and the external eideali flux necessary to keep such equilibrium is derived. Then a linear formula is given for the deviation of the plasma boundary from the ideal shape given the error in matching the external eideali flux. We apply this formula to the ITER quasi-static and dynamic plasma boundary control problem. In the quasi-static problem we aim at computing the optimal equilibrium currents that maintain a desired plasma equilibrium. The external flux is matched at the plasma boundary trading-off accuracy and cost. In the dynamic problem, the plasma equilibrium and external currents are known and we derive a linear model describing the (unstable) plasma vertical dynamics. The method proposed presents several advantages: it is computationally cheap since it requires only the mesh of the plasma region. It is remarkably robust since it requires solving an elliptic, fixed boundary problem plus the computation and SVD of the mutual inductance matrix coils-plasma boundary nodes, therefore avoiding the solution of the numerically more delicate free-boundary problem. It computes important equilibrium features (e.g. instability growth rate) and is naturally suited to include the presence of 3D eddy currents in the surrounding metallic structures.
Sponsorship	Honeywell Lab. Xerox Nat. Instruments Math Works
Starting Page	4640
Ending Page	4645
File Size	394779
Page Count	6
File Format	PDF
ISBN	0780379241
ISSN	01912216
DOI	10.1109/CDC.2003.1272298
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-12-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tokamaks Plasma stability Plasma devices Magnetohydrodynamics Design engineering Shape Costs Robustness Inductance Eddy currents
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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