Systematic study of the undulator based ilc positron Source: Production and capture

A systematic study of the positron production and capturing yield for the undulatoer-based ILC positron source has been performed. We use undulator parameters of k = 0.3 - 1 , lambda = 0.7 - 1.5 cm as the reference design. The yield is defined as number of positrons captured at the damping ring input by a single electron passing through 100 meter long undulator. Several scenarios for polarizations and capturing schemes are considered here: polarized (60%) and low-polarized positrons, immersed target in magnetic field and non-immersed cases.