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We revisit the numerical construction of the initial condition for the dipoleamplitude from the McLerran-Venugopalan model in the context of the JIMWLKevolution equation. We observe large finite volume effects induced by thePoisson equation formulated on a torus. We show that the situation can bepartially cured by introducing an infrared regularization. We propose aprocedure that has negligible finite volume corrections. The control of thefinite volume and finite lattice spacings effects is crucial when consideringthe numerical solutions of the JIMWLK evolution equation with the collinearimprovement.

Finite volume effects in the McLerran-Venugopalan initial condition for the JIMWLK equation