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Some inverse problems around the tokamak Tore Supra

TLDR
In this paper, two inverse problems related to the tokamak \textsl{Tore Supra} through the study of the magnetostatic equation for the poloidal flux are considered.
Abstract
We consider two inverse problems related to the tokamak \textsl{Tore Supra} through the study of the magnetostatic equation for the poloidal flux. The first one deals with the Cauchy issue of recovering in a two dimensional annular domain boundary magnetic values on the inner boundary, namely the limiter, from available overdetermined data on the outer boundary. Using tools from complex analysis and properties of genereralized Hardy spaces, we establish stability and existence properties. Secondly the inverse problem of recovering the shape of the plasma is addressed thank tools of shape optimization. Again results about existence and optimality are provided. They give rise to a fast algorithm of identification which is applied to several numerical simulations computing good results either for the classical harmonic case or for the data coming from \textsl{Tore Supra}.

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Citations
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Journal ArticleDOI

An $H_\mathsf{div}$-Based Mixed Quasi-reversibility Method for Solving Elliptic Cauchy Problems

TL;DR: A new quasi-reversibility approach is introduced for approximating the solution of the ill-posed Cauchy problem in a regularized manner based on a well-posed mixed variational problem on H^1\times H_\mathsf{div}$ with the corresponding solution pair converging monotonically to the Solution of the Cauche problem and the associated flux, if they exist.
Journal ArticleDOI

Dirichlet/Neumann problems and Hardy classes for the planar conductivity equation

TL;DR: In this article, Hardy spaces of the conjugate Beltrami equation over Dini-smooth finitely connected domains were studied for real contractive contracts with real contractivity in the range of r/(r-1)
Posted Content

Pseudo-holomorphic functions at the critical exponent

TL;DR: In this article, an analog of the M.~Riesz theorem and a topological converse to the Bers similarity principle were proved for the Dirichlet problem with weighted boundary data for 2-D isotropic conductivity equations.
Journal ArticleDOI

Pseudo-holomorphic functions at the critical exponent

TL;DR: In this paper, the authors studied Hardy classes on the disk associated to the equa- tion of Dirichlet problems for 2-D isotropic conductivity equations whose coefficients have logarithm in W 1,2.
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Decomposition theorem and Riesz basis for axisymmetric potentials in the right half-plane

TL;DR: In this article, the authors considered the generalized axisymmetric potentials (GASP) and proved a new decomposition theorem for the GASP in annular domains.
References
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Velocity extension for the level-set method and multiple eigenvalues in shape optimization ∗

Edde Gournay
TL;DR: In this paper, an extension of the velocity of the underlying Hamilton-Jacobi equation is proposed for structural optimization by the level-set method, which is endowed with a Hilbertian structure based on the H 1 Sobolev space.
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Discrete gradient flows for shape optimization and applications

TL;DR: This work presents a variational framework for shape optimization problems that establishes clear and explicit connections among the continuous formulation, its full discretization and the resulting linear algebraic systems, and proposes a Schur complement approach to solve the resultinglinear systems efficiently.
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Shape Optimization and Fictitious Domain Approach for Solving Free Boundary Problems of Bernoulli Type

TL;DR: This contribution deals with an efficient method for the numerical realization of the exterior and interior Bernoulli free boundary problems based on a shape optimization approach.
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Variational approach to shape derivatives for a class of Bernoulli problems

TL;DR: In this article, the shape derivative of a functional related to a Bernoulli problem is derived without using the shape derivatives of the state, and the gradient information is combined with level set ideas in a steepest descent algorithm.
Journal ArticleDOI

Levenberg Marquardt level set methods for inverse obstacle problems

Martin Burger
- 01 Feb 2004 - 
TL;DR: In this paper, a Levenberg-Marquardt level set method for inverse obstacle problems is proposed, based on a recently developed framework for the construction of level set methods, by varying the function space used for the normal velocity.