$$L^1$$ penalization of volumetric dose objectives in optimal control of PDEs |
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Authors: | Richard C Barnard " target="_blank">Christian Clason |
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Institution: | 1.Oak Ridge National Laboratory,Oak Ridge,USA;2.Faculty of Mathematics,University Duisburg-Essen,Essen,Germany |
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Abstract: | This work is concerned with a class of PDE-constrained optimization problems that are motivated by an application in radiotherapy treatment planning. Here the primary design objective is to minimize the volume where a functional of the state violates a prescribed level, but prescribing these levels in the form of pointwise state constraints leads to infeasible problems. We therefore propose an alternative approach based on \(L^1\) penalization of the violation that is also applicable when state constraints are infeasible. We establish well-posedness of the corresponding optimal control problem, derive first-order optimality conditions, discuss convergence of minimizers as the penalty parameter tends to infinity, and present a semismooth Newton method for their efficient numerical solution. The performance of this method for a model problem is illustrated and contrasted with an alternative approach based on (regularized) state constraints. |
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