Axel Brachmann, Ray Alley, M. Browne, G. Cates, James Clendenin, J. deLamare, Josef Frisch, T. Galetto, E. Hughes, Thomas Humensky, K. Kumar, Peter Mastromarino, J. Sodja, James Turner, Klaus Witte, Michael Woods
SLAC E158 is an experiment to make the first measurement of parity violation in Moller scattering. The left-right cross-section asymmetry in the elastic scattering of a 45-GeV polarized electron beam off unpolarized electrons in a liquid hydrogen target will be measured to an accuracy of better than 10-8, with the expected Standard Model asymmetry being approximately 10-7. An intense circularly polarized laser beam for the polarized electron source is required with the ability to quickly switch between left and right polarization states with minimal left-right asymmetries in the parameters of the electron beam. This laser beam is produced by a unique SLAC-designed, flash-lamp pumped, Ti:Sapphire laser. We present this laser system design and initial results from recent commissioning runs.
P. Saez, Ray Alley, H. Aoyagi, James Clendenin, Josef Frisch, C. Garden, Earl Hoyt, Bob Kirby, L. Klaisner, A. Kulikov, C. Prescott, D. Schultz, Huan Tang, James Turner, Klaus Witte, Michael Woods, M. Zolotorev
The SLAC Linear Collider (SLC) Polarized Electron Source (PES) photocathodes have shown a charge saturation when illuminated with a high intensity laser pulse. This charge limit in the cesium-activated GaAs crystal seems to be strongly dependent on its surface condition and on the incident light wavelength. Charge limit studies with highly polarized strained lattice GaAs materials are presented.
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