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Abstracts Brochure - CERN

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WEPLS — Poster Session 28-Jun-06 16:00 - 18:00<br />

Spin Tracking at the ILC<br />

Polarized beams will play a key role in the<br />

physics programme at the International Linear<br />

Collider (ILC). It is expected that the electron<br />

and positron sources will be able to produce<br />

beams with polarizations of about 90%<br />

and 60% respectively. However, to obtain accurate<br />

measurements it is essential to have<br />

I.R. Bailey, I.R. Bailey, D.P. Barber, J.A. Clarke, J.B. Dainton,<br />

O.B. Malyshev, G.A. Moortgat-Pick, D.J. Scott (Cockcroft Institute)<br />

E. Baynham, T.W. Bradshaw, A.J. Brummitt, F.S. Carr, Y.<br />

Ivanyushenkov, J. Rochford (CCLRC/RAL) P. Cooke, L.I. Malysheva<br />

(Liverpool University, Science Faculty)<br />

precise knowledge and control of the polarization at the interaction point itself. It follows that the theoretical calculations<br />

used for spin tracking must be guaranteed to match the anticipated 0.1% relative measurement uncertainty<br />

of the polarimeters. To meet this need, the heLiCal collaboration is developing a computer simulation to track the<br />

evolution of the polarization of bunches of electrons and positrons from the sources to the interaction point. We have<br />

studied the beam spin dynamics throughout the ILC including spin precession and radiative spin-flip processes in<br />

the positron source, damping rings, beam delivery system and the interaction region. We present the result of these<br />

studies with special emphasis on the impact of new theoretical calculations for the CAIN bunch-bunch simulation<br />

including full spin correlations and higher-order contributions.<br />

Cold Atom Electron Sources<br />

We are developing a completely new<br />

method of producing high-brightness electron<br />

bunches, based on extraction of electrons<br />

from an ultra-cold plasma, created by<br />

O.J. Luiten, M.P. Reijnders, G. Taban, E.J.D. Vredenbregt, S.B. van<br />

der Geer (TUE)<br />

photo-ionization of a cloud of laser-cooled atoms*. In this way extremely low thermal emittances (

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