The full exploitation of the physics potential of a future Linear Collider requires the development of polarised positron beams. A very promising scheme for the technical realisation is the use of helical undulators, generating circular polarised photons of several MeV which are then converted in a thin target to longitudinally polarised positrons. The experiment E-166 tests this scheme. It uses the low-emittance 50-GeV electron beam at the Final Focus Test Beam (FFTB) at SLAC, passing through a 1 meter-long helical undulator. The flux and polarisation of the undulator photons as well as the properties of the positrons will be measured and will be compared with simulations.
@article{arxiv.hep-ph/0312120,
title = {Prototype for an Undulator-based Source for Polarised Positrons: International Polarised Positron Collaboration: Project E-166},
author = {Gudrid Moortgat-Pick},
journal= {arXiv preprint arXiv:hep-ph/0312120},
year = {2011}
}
Comments
3 pages, 5 postscript figures, epj style, talk given at the EPS conference, Aachen, Germany, July 2003