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Birch, A.

Paper Title Page
THPMN074 The Status of the HeLiCal Contribution to the Polarised Positron Source for the International Linear Collider 2874
 
  • D. J. Scott, A. Birch, J. A. Clarke, O. B. Malyshev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • I. R. Bailey, D. P. Barber, J. B. Dainton, L. J. Jenner
    Cockcroft Institute, Warrington, Cheshire
  • E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, Y. Ivanyushenkov, A. J. Lintern, J. Rochford
    STFC/RAL, Chilton, Didcot, Oxon
  • L. I. Malysheva
    Liverpool University, Science Faculty, Liverpool
  • G. A. Moortgat-Pick
    Durham University, Durham
  
  The positron source for the International Linear Collider is a helical undulator-based design, which can generate unprecedented quantities of polarised positrons. The HeLiCal collaboration takes responsibility for the design and prototyping of the superconducting helical undulator, which is a highly demanding short period device with very small aperture, and also leads the start to end simulations of the polarised electrons and positrons to ensure that the high polarisation levels generated survive from the source up to the collision point. This paper will provide an update on the work of the collaboration, focusing on these two topic areas, and will also discuss future plans.  
THPMN083 Spin Tracking at the International Linear Collider 2901
 
  • I. R. Bailey, I. R. Bailey, J. A. Clarke, J. B. Dainton, L. J. Jenner, O. B. Malyshev, L. I. Malysheva, G. A. Moortgat-Pick, D. J. Scott
    Cockcroft Institute, Warrington, Cheshire
  • D. P. Barber
    DESY, Hamburg
  • E. Baynham, T. W. Bradshaw, F. S. Carr, Y. Ivanyushenkov, J. Rochford
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • A. Birch
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • A. J. Brummitt, A. J. Lintern
    STFC/RAL, Chilton, Didcot, Oxon
  • P. Cooke, L. Zang
    Liverpool University, Science Faculty, Liverpool
  • A. F. Hartin
    OXFORDphysics, Oxford, Oxon
  
  Funding: This work is supported in part by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.

Polarized electron and positron beams are foreseen for the future International Linear Collider (ILC), with polarized electrons already included in the baseline design and polarized positrons seen as a highly-desirable upgrade. High precision physics requires the polarization of both beams to be known with a relative uncertainty of approximately 0.5% or better. Therefore all possible depolarization effects that could operate between the polarized sources and the interaction regions have to be carefully modelled. The "heLiCal" collaboration aims to provide a full "cradle-to-grave" analysis of all depolarization effects at the ILC, and to develop software tools to carry out appropriate computer simulations. In this paper we report on the first phase of our work which includes extensive simulations of the ILC spin-dynamics and a detailed study of beam-beam depolarization effects at the interaction point(s).