  In the future the International Linear Collider (ILC), a helical
undulator-based polarized positron source, is expected to be chosen. A high
energy electron beam passes through a superconducting helical undulator in
order to create circularly polarized photons which will be directed to a
conversion target, resulting in electron-positron pairs. The resulting positron
beam is longitudinally polarized. Since the photons are produced with an
opening angle and pass through a long superconducting helical undulator, some
of these photons will strike the undulator walls. Therefore photon masks must
be placed along the undulator line in order to keep the power deposited in the
undulator walls below the acceptable limit of 1W/m. The baseline design of the
ILC is focused on 250 GeV center-of-mass energy and upgrade to center-of-mass
energies of 350 and 500 GeV is foreseen. This paper shows a detailed study of
the ideal power deposited along the masks for both 350 and 500 GeV
center-of-mass energies.
