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In the baseline design of the International Linear Collider (ILC) anundulator-based source is foreseen for the positron source. In this study theenergy deposition in the pulsed flux concentrator (FC) of positron source iscalculated for the ILC at 250 GeV center-of-mass energy. The peak energy of 33J/g deposited by one beam pulse in the current design of the FC is above thelimit for copper material. Several promising options were considered to solvethe issue of overheating the FC: the quarter wave transformer (QWT) has asignificantly bigger aperture and is considered as an valuable and safealternative for the FC. Since the positron source with a QWT is expected tolead to a lower positron capture efficiency, also the expected positron yieldwas calculated in addition to the energy deposition in QWT.

Undulator-Based Positron Source at 250 GeV CM Energy with Different Optical Matching Devices: Pulsed Flux Concentrator and Quarter Wave Transformer