Spin dynamics in LEP with 40-100 GeV beams

Details Spin dynamics in LEP with 40-100 GeV beams Spin dynamics in LEP with 40-100 GeV beams

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..169a&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 169-178 (2001).

Physics

3

Polarization In Interactions And Scattering, Storage Rings, Relativistic Electron And Positron Beams, Polarized Beams

Scientific paper

Radiative spin polarization has been studied in the Large Electron-Positron Collider (LEP) at CERN for beam energies from 40 GeV to 100 GeV. The data cover a unique range of spin dynamics, not previously accessible with other storage rings. After optimization of machine parameters and the successful application of new Harmonic Spin Matching techniques, a transverse beam polarization of 57% was obtained at 44.7 GeV. At 60.6 GeV the maximum level reached 8%. The observed energy dependence of radiative spin polarization at LEP is in excellent agreement with the theoretically expected behavior. The LEP data provide the first experimental confirmation for a theory of depolarization at very high energies, first developed in the 1970s by Derbenev and Kontratenko. The results will help to guide the design of any future high energy electron-positron storage ring requiring polarized beams. .

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