Speaker
Description
Positron sources are key elements for future lepton colliders, such as FCC-ee. In order to generate high intensity and low emittance positron beams, two alternative approaches based on oriented crystals have been proposed with respect to the conventional method, which relies on the electron into positron conversion in a thick amorphous target [1,2]. In this contribution, we present the optimization of the crystal-based positron source for FCC-ee. The study was carried out through detailed simulations of the positron production in crystals (Geant4) and the tracking inside the positron injector (RF-track). Also, we present the results of some experiments to demonstrate the photon and positron production enhancement achievable with oriented tungsten crystals. The setup of these experiments was simulated in Geant4 taking advantage of our novel G4ChannelingFastSimModel [3] and G4BaierKatkov models. The excellent agreement obtained between experimental and simulation results validate our simulation approach to the positron production for FCC-ee.
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