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Sheppard, J.

Paper Title Page
THPMS060 Transport Optics Design and Multi-particle Tracking for the ILC Positron Source 3124
 
  • F. Zhou, Y. K. Batygin, Y. Nosochkov, J. Sheppard, M. Woodley
    SLAC, Menlo Park, California
  • W. Liu
    ANL, Argonne, Illinois
 
  Funding: U. S. DOE Contract DE-AC02-76SF00515

Undulator-based positron source is adopted as the International Linear Collider baseline design. Complete optics to transport the positron beam having large angular divergence and large energy spread from a thin Ti target 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 optical matching device, capture accelerator system, transport system, superconducting booster linac, spin rotators, and energy compressor. Positron capture efficiency of different schemes (immersed vs shielded target, and flux concentrator vs quarter wave transformation for the optics matching system) is compared. For the scheme of a shielded target and quarter wave transformation, the simulation shows that 15.1% of the positrons from the target are captured within the damping ring 6-D acceptance at the entrance of the damping ring injection line.

 
THPMS061 Design of a High-current Injector and Transport Optics for the ILC Electron Source 3127
 
  • F. Zhou, Y. K. Batygin, A. Brachmann, J. E. Clendenin, R. H. Miller, J. Sheppard, M. Woodley
    SLAC, Menlo Park, California
 
  Funding: U. S. DOE Contract DE-AC02-76SF00515

A train of 2-nsμbunches are generated in the DC-gun based injector in the ILC e- source; a bunching system with extremely high bunching efficiency to compress bunch down to 20 ps FWHM is designed. Complete optics to transport the electron beam to 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, chicane, 5-GeV SC booster linac, spin rotators and energy compressor. It shows more than 95% of electrons from the DC-gun are captured within the 6-D damping ring acceptance at the entrance of damping ring injection line. The field and alignment errors, and orbit correction are analyzed.