Effect of 3D Polarization profiles on polarization measurements and colliding beam experiments

Fischer, W.; Bazilevsky, A.

doi:10.2172/1061980

Cited by 2 publications

(6 citation statements)

References 2 publications

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“…1. We use Hamamatsu single strip PIN photodiodes in 45-degree detectors (1,4,5,8). 90-degree detectors consist of Si strips manufactured at BNL.…”

Section: Ags P-carbon Cni Polarimetermentioning

confidence: 99%

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Polarimetry at the AGS

Poblaguev¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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Proton beam polarization measurement is essential for the Relativistic Heavy-Ion Collider (RHIC) spin program at Brookhaven National Laboratory (BNL). A proton-Carbon polarimeter is employed to monitor beam polarization at the Alternating Gradient Synchrotron (AGS) which injects 24 GeV/c protons into the RHIC rings. The methods of the polarization measurements and systematic errors are discussed. The results of the experimental testing of the "zero emittance polarization" model is given.

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“…1. We use Hamamatsu single strip PIN photodiodes in 45-degree detectors (1,4,5,8). 90-degree detectors consist of Si strips manufactured at BNL.…”

Section: Ags P-carbon Cni Polarimetermentioning

confidence: 99%

“…If the development of a polarization profile is the primary reason for the reduction of the average polarization P then [5] …”

Section: Zero Emittance Polarizationmentioning

confidence: 99%

Polarimetry at the AGS

Poblaguev¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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“…As shown experimentally, the beam intensity and polarization profiles measured with the p-C polarimeters in AGS and RHIC can be well approximated by Gaussian distributions [5,7]. The basic framework for polarization profile analysis was introduced in A. Bazilevsky and W. Fischer papers [5,6]. For polarization profile characterization, parameters R H for horizontal profiles and R V for vertical profiles were introduced as follows:…”

Section: Polarization and Polarization Profile Measurements In Ags Anmentioning

confidence: 99%

“…where σ x, I , σ x, P ,σ y,, I ,σ y, P are corresponding rms widths of Gaussian distributions for intensity and polarization profiles. Then an average beam polarization (as measured by the H-jet polarimeter) <P> can be calculated: (1) where P 0 is the maximum polarization of the beam core (at zero betatron oscillation amplitudes in both vertical and horizontal directions) [6].…”

Section: Polarization and Polarization Profile Measurements In Ags Anmentioning

confidence: 99%

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Polarization measurements and absolute polarization values evolution during proton beam acceleration in the RHIC accelerator complex

Zelenski¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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The knowledge of absolute polarization measurements at different beam energies is very important for understanding of the polarization losses during acceleration and transport in the RHIC accelerator chain: Source-Linac-Booster-AGS-RHIC. In the RHIC accelerator complex there are two absolute proton polarimeters: the elastic proton-Carbon polarimeter at 200 MeV beam energy and the CNI H-jet polarimeter at 24-255 GeV in the RHIC ring. The polarization transport simulations show that depolarization occurs at the edge of the beam and that the polarization of the beam core at the center of the 2-dimensional beam intensity profile should be preserved during acceleration. Polarization profile measurements by the scanning p-Carbon CNI polarimeters in the AGS and RHIC provide experimental data that support these expectations. The combination of polarization transport simulation and absolute polarization measurements tools at AGS injection and RHIC store energies provides complimentary information on polarization losses along the RHIC accelerator chain. In addition, an estimate for the upper limit on polarization in collisions is calculated from the absolute polarization measurements at beam energies 200 MeV, 100 GeV and 255 GeV.

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Effect of 3D Polarization profiles on polarization measurements and colliding beam experiments

Cited by 2 publications

References 2 publications

Polarimetry at the AGS

Polarimetry at the AGS

Polarization measurements and absolute polarization values evolution during proton beam acceleration in the RHIC accelerator complex

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