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

Photon Masks for the ILC Positron Source with 175 and 250 GeV Electron Drive Beam