Robust control problems of vortex dynamics in superconducting films with Ginzburg-Landau complex systems

Belmiloudi, Aziz

doi:https://doi.org/10.1155/AAA/2006/26724

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Volume 2006 | Article ID 026724 | https://doi.org/10.1155/AAA/2006/26724

Robust control problems of vortex dynamics in superconducting films with Ginzburg-Landau complex systems

Aziz Belmiloudi^1,2

Received10 Dec 2004

Accepted01 Mar 2005

Published28 Feb 2006

Abstract

We formulate and study robust control problems for a two-dimensional time-dependent Ginzburg-Landau model with Robin boundary conditions on phase-field parameter, which describes the phase transitions taking place in superconductor films with variable thickness. The objective of such study is to control the motion of vortices in the superconductor films by taking into account the influence of noises in data. Firstly, we introduce the perturbation problem of the nonlinear governing coupled system of equations (the deviation from the desired target). The existence and the uniqueness of the solution of the perturbation are proved as well as stability under mild assumptions. Afterwards, the robust control problems are formulated in the case when the control is in the external magnetic field and in the case when the control is in the initial condition of the vector potential. We show the existence of an optimal solution, and we also find necessary conditions for a saddle point optimality.

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Copyright

Copyright © 2006 Aziz Belmiloudi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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