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Description
A high-yield positron source is essential for FCC-ee, which requires low-emittance beams with sufficient intensity for rapid injection. At the Z-pole, positron bunches of 2.14×10¹⁰ particles (5 nC) are needed, with a safety margin corresponding to 12.8 nC at the damping ring (DR). The positron source employs 2.86 GeV electrons striking a 15 mm tungsten target, with capture provided by a Matching Device using a High-Temperature Superconducting (HTS) technology and a linac embedded in a solenoidal channel.
In the Feasibility Study phase, positron capture was realized with six 2 GHz TW structures, optimized using Xopt to satisfy DR acceptance. In this work, we present a new approach to estimating the accepted positron yield based on particle tracking in the DR. Furthermore, following the latest design recommendations, we investigate a revised capture system operating at 3 GHz, potentially combined with a stronger focusing channel.
