dorsal/arxiv
View SchemaSLAC's Polarized Electron Source Laser System and Minimization of Electron Beam Helicity Correlations for the E-158 Parity Violation Experiment
| Authors | T. B. Humensky, R. Alley, A. Brachmann, M. J. Browne, G. D. Cates, J. Clendenin, J. deLamare, J. Frisch, T. Galetto, E. W. Hughes, K. S. Kumar, P. Mastromarino, J. Sodja, P. A. Souder, J. Turner, M. Woods |
|---|---|
| Categories | |
| ArXiv ID | physics/0209067 |
| URL | https://arxiv.org/abs/physics/0209067 |
| DOI | 10.1016/j.nima.2003.09.065 |
| Journal | Nucl.Instrum.Meth. A521 (2004) 261-298 |
Abstract
SLAC E-158 is an experiment designed to make the first measurement of parity violation in Moller scattering. E-158 will measure the right-left cross-section asymmetry, A_LR^Moller, in the elastic scattering of a 45-GeV polarized electron beam off unpolarized electrons in a liquid hydrogen target. E-158 plans to measure the expected Standard Model asymmetry of ~10^-7 to an accuracy of better than 10^-8. To make this measurement, the polarized electron source requires for operation an intense circularly polarized laser beam and the ability to quickly switch between right- and left-helicity polarization states with minimal right-left helicity-correlated asymmetries in the resulting beam parameters (intensity, position, angle, spot size, and energy), ^beam A_LR's. This laser beam is produced by a unique SLAC-designed flashlamp-pumped Ti:Sapphire laser and is propagated through a carefully designed set of polarization optics. We analyze the transport of nearly circularly polarized light through the optical system and identify several mechanisms that generate ^beam A_LR's. We show that the dominant effects depend linearly on particular polarization phase shifts in the optical system. We present the laser system design and a discussion of the suppression and control of ^beam A_LR's. We also present results on beam performance from engineering and physics runs for E-158.
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"abstract": "SLAC E-158 is an experiment designed to make the first measurement of parity\nviolation in Moller scattering. E-158 will measure the right-left cross-section\nasymmetry, A_LR^Moller, in the elastic scattering of a 45-GeV polarized\nelectron beam off unpolarized electrons in a liquid hydrogen target. E-158\nplans to measure the expected Standard Model asymmetry of ~10^-7 to an accuracy\nof better than 10^-8. To make this measurement, the polarized electron source\nrequires for operation an intense circularly polarized laser beam and the\nability to quickly switch between right- and left-helicity polarization states\nwith minimal right-left helicity-correlated asymmetries in the resulting beam\nparameters (intensity, position, angle, spot size, and energy), ^beam A_LR\u0027s.\nThis laser beam is produced by a unique SLAC-designed flashlamp-pumped\nTi:Sapphire laser and is propagated through a carefully designed set of\npolarization optics. We analyze the transport of nearly circularly polarized\nlight through the optical system and identify several mechanisms that generate\n^beam A_LR\u0027s. We show that the dominant effects depend linearly on particular\npolarization phase shifts in the optical system. We present the laser system\ndesign and a discussion of the suppression and control of ^beam A_LR\u0027s. We also\npresent results on beam performance from engineering and physics runs for\nE-158.",
"arxiv_id": "physics/0209067",
"authors": [
"T. B. Humensky",
"R. Alley",
"A. Brachmann",
"M. J. Browne",
"G. D. Cates",
"J. Clendenin",
"J. deLamare",
"J. Frisch",
"T. Galetto",
"E. W. Hughes",
"K. S. Kumar",
"P. Mastromarino",
"J. Sodja",
"P. A. Souder",
"J. Turner",
"M. Woods"
],
"categories": [
"physics.acc-ph",
"hep-ex",
"nucl-ex",
"physics.ins-det"
],
"doi": "10.1016/j.nima.2003.09.065",
"journal_ref": "Nucl.Instrum.Meth. A521 (2004) 261-298",
"title": "SLAC\u0027s Polarized Electron Source Laser System and Minimization of Electron Beam Helicity Correlations for the E-158 Parity Violation Experiment",
"url": "https://arxiv.org/abs/physics/0209067"
},
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