Demonstration of a High-Field Short-Period Superconducting Helical Undulator Suitable for Future TeV-Scale Linear Collider Positron Sources

D. J. Scott; J. A. Clarke; D. E. Baynham; V. Bayliss; T. Bradshaw; G. Burton; A. Brummitt; S. Carr; A. Lintern; J. Rochford; O. Taylor; Y. Ivanyushenkov

doi:10.1103/PhysRevLett.107.174803

Demonstration of a High-Field Short-Period Superconducting Helical Undulator Suitable for Future TeV-Scale Linear Collider Positron Sources

D. J. Scott, J. A. Clarke, D. E. Baynham, V. Bayliss, T. Bradshaw, G. Burton, A. Brummitt, S. Carr, A. Lintern, J. Rochford, O. Taylor, Y. Ivanyushenkov

DOI 10.1103/PhysRevLett.107.174803 · Physical Review Letters

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Abstract

The first demonstration of a full-scale working undulator module suitable for future TeV-scale positron-electron linear collider positron sources is presented. Generating sufficient positrons is an important challenge for these colliders, and using polarized e+ would enhance the machine’s capabilities. In an undulator-based source polarized positrons are generated in a metallic target via pair production initiated by circularly polarized photons produced in a helical undulator. We show how the undulator design is developed by considering impedance effects on the electron beam, modeling and constructing short prototypes before the successful fabrication, and testing of a final module.