[SLAC]
[SLAC Pubs and Reports]
SLAC-PUB-12587
Design of a High-current Injector and Transport Optics for the ILC Electron Source
Abstract
A train of 1.3-ns micro bunches of longitudinally
polarized electrons are generated in a 140-kV DC-gun
based injector in the International Linear Collider electron
source; a bunching system with extremely high bunching
efficiency to compress the micro-bunch down to 20 ps
FWHM is designed. Complete optics to transport the
electron bunch to the entrance of the 5-GeV damping ring
injection line is developed. Start-to-end multi-particle
tracking through the beamline is performed including the
bunching system, pre-acceleration, vertical chicane,
5-GeV superconducting booster linac, spin rotators and
energy compressor. With optimizations of energy
compression, 94% of the electrons from the DC-gun are
captured within the damping ring 6-D acceptance --
A_x + A_y \leq 0.09 m and \Delta E \times \Delta z \leq
(\pm 25MeV) \times (\pm 3.46cm) --
at the entrance of the damping ring injection line.
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