title: Demonstration of a high-field short-period superconducting helical undulator suitable for future TeV-scale linear collider positron sources.
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.
authors: STFC Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, United Kingdom. duncan.scott@stfc.ac.uk
authors: D J
authors: DJ
authors: Scott
authors: J A
authors: JA
authors: Clarke
authors: D E
authors: DE
authors: Baynham
authors: V
authors: V
authors: Bayliss
authors: T
authors: T
authors: Bradshaw
authors: G
authors: G
authors: Burton
authors: A
authors: A
authors: Brummitt
authors: S
authors: S
authors: Carr
authors: A
authors: A
authors: Lintern
authors: J
authors: J
authors: Rochford
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authors: Taylor
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authors: Ivanyushenkov