The Stanford linear accelerator polarized electron source

Alley, R.; Aoyagi, H.; Clendenin, J. E.; Frisch, J.; Gärdén, Cecilia; Hoyt, E. W.; Kirby, R. E.; Klaisner, L.; Kulikov, A.; Miller, R.H.; Mulhollan, G. A.; Prescott, C. Y.; Saéz, Pablo; Schultz, D.; Tang, Huan; Turner, J.; Witte, K.; Woods, M.; Yeremian, A.D.; Zolotorev, M.

doi:10.1016/0168-9002(95)00450-5

Cited by 120 publications

(49 citation statements)

References 53 publications

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“…The observation that polarization is higher at higher vacuum levels (low QE) was reconfirmed. [27] A substantial drop in polarization with new cesium deposition on the photocathode surface was also reconfirmed. However, careful analysis of the polarization dependence on QE suggests that two different effects might be at work., The first is that polarization drops when electrons scatter with the recently deposited Cs layer and the other effect is that low polarization electrons are filtered out by a higher vacuum level.…”

Section: Chapter 4 Experimental Resultsmentioning

confidence: 73%

“…[27] In particular; the polarization seems to improve as the QE decays. On the other harid, the polarization drops a few percentage points after each cesiation when the QE is near its highest value.…”

Section: Polarization Sensitivity To Quantum Efficiencymentioning

confidence: 99%

“…The activation of the photocathode in the loadlock chamber involves heat cleaning the surface under vacuum and then applying layers of Cs-NF3 until the photocathode achieves its maximum photoemission efficiency. (For more details on photocathode preparation see reference [27].) Once activated, the photocathode is transferred from the loadlock activation chamber into the gun.…”

Section: Chapter 3 the Gun Test Laboratorymentioning

confidence: 99%

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Polarization and charge limit studies of strained GaAs photocathodes

Saéz¹

1997

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Section: Chapter 4 Experimental Resultsmentioning

confidence: 73%

Section: Polarization Sensitivity To Quantum Efficiencymentioning

confidence: 99%

Section: Chapter 3 the Gun Test Laboratorymentioning

confidence: 99%

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Polarization and charge limit studies of strained GaAs photocathodes

Saéz¹

1997

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“…The Flash:Ti system was originally designed and commissioned in 1993 [4,10] and has seen extensive upgrades in preparation for E-158. Table 1 summarizes the parameters of the Flash:Ti laser beam for E-158.…”

Section: Introductionmentioning

confidence: 99%

“…SLAC's polarized electron source is based on photoemission from a strained GaAs cathode pumped by an intense, circularly polarized laser beam [4,5]. Two laser systems exist to pump the cathode: a Nd:YLF-pumped Ti:Sapphire laser (the "YLF:Ti") that generates short (2-ns) pulses of electrons for SLAC's Positron Electron Project (PEP) rings, and a flashlamp-pumped Ti:Sapphire laser (the "Flash:Ti") used to generate 270-ns pulses for use in fixed target experiments at SLAC's "End Station A" such as E-158, described briefly below.…”

Section: Introductionmentioning

confidence: 99%

SLAC's polarized electron source laser system and minimization of electron beam helicity correlations for the E-158 parity violation experiment

Humensky¹,

Alley²,

Brachmann³

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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SLAC E-158 is an experiment designed to make the first measurement of parity violation in Møller scattering. E-158 will measure the right-left cross-section asymmetry, A M øller LR , 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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Sources, Particle—Electron

Sheffield

2003

Digital Encyclopedia of Applied Physics

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The Stanford linear accelerator polarized electron source

Cited by 120 publications

References 53 publications

Polarization and charge limit studies of strained GaAs photocathodes

Polarization and charge limit studies of strained GaAs photocathodes

SLAC's polarized electron source laser system and minimization of electron beam helicity correlations for the E-158 parity violation experiment

Sources, Particle—Electron

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