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The present $\mathrm{R}\&\mathrm{D}$ activities for the International LargeDetector Time Projection Chamber (ILD-TPC) concern the adoption of the micropattern devices for the gaseous amplification stage. Seven Micromegas moduleswhich are commissioned on the end-plate of a Large Prototype TPC (LPTPC) atDESY, were tested with a 5 GeV electron beam, under a 1 T magnetic field.During experiments, reduced signal sensitivity as well as distortion in thereconstructed track was observed at the boundaries of these modules.Electrostatic field inhomogeneity near the module boundaries was considered tobe the possible major reason behind these observations. In the present work,this hypothesis has been explored using the Garfield simulation framework. Ithas been possible to contain the computational complexity of the problem withsuitable simplifications. Qualitative and quantitative agreements withexperimental results have been achieved. Possibility of mitigating the problemshas been proposed using the same simulation framework.

Numerical study of track distortion in the Large Prototype TPC with end-plate based on bulk Micromegas