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- I.R. Bailey, I.R. Bailey, J.B. Dainton, D.J. Scott
Cockcroft Institute, Warrington, Cheshire
- V. Bharadwaj, J. Sheppard
SLAC, Menlo Park, California
- P. Cooke, P. Sutcliffe
Liverpool University, Science Faculty, Liverpool
- J.G. Gronberg, D.J. Mayhall, W.T. Piggott, W. Stein
LLNL, Livermore, California
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The future International Linear Collider (ILC) will require of order 1014 positrons per second to fulfil its luminosity requirements. The current baseline design produces this unprecedented flux of positrons using an undulator-based source. In this concept, a collimated beam of 10MeV photons produced from the action of an undulator on the main electron beam of the ILC is incident on a conversion target. Positrons produced in the resulting electromagnetic shower can then be captured, accelerated and injected into a damping ring. The international community is pursuing several alternative technologies to develop a target capable of long-term operation in the intense photon beam. In the design being developed jointly by the Cockcroft Institute, LLNL and SLAC, a thin (0.4 radiation length) water-cooled Titanium alloy target wheel of diameter 4m is rotated at approximately 1000rpm to spread the incident power of each pulse over a wide area. We present the latest target design, report on the status of the target prototypes and computer models, and review the interplay between the target technology, capture optics, photon collimator and remote-handling systems.
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