Speaker
Description
The Electron–Ion Collider (EIC) requires a 750 MeV pre-injector operating at 30 Hz and delivering polarized electron bunch charges of 1 up to 2 nC. The electron source provides longitudinal polarization, whereas the spin must be vertical prior to injection into the ring. To achieve this, we implement a spin rotator at gun energy. The primary challenge is to preserve polarization and maintain a vertical spin orientation while transporting and accelerating high–space-charge bunches through the entire injector chain. A key constraint is that solenoid focusing fields cannot be superimposed with the accelerating fields, although this configuration is commonly used in S-band linac injectors for high-bunch-charge beams. We propose an EIC pre-injector design consisting of a bunching section, an L-band capture section, and an S-band linac to accelerate nC bunch charge, vertically polarized bunches to 750 MeV. We will present the overall injector concept, the pre-injector design, and the performance goals.
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