A novel comparison of Møller and Compton electron-beam polarimeters

Magee, J. A.; Narayan, A.; Jones, D.; Beminiwattha, R.; Cornejo, J. C.; Dalton, M. M.; Deconinck, W.; Dutta, D.; Gaskell, D.; Martin, J. W.; Paschke, K.; Tvaskis, V.; Asaturyan, A.; Benesch, J.; Cates, G. D.; Cavness, B.; Dillon-Townes, L. A.; Hays, G.; Hoskins, J. R.; Ihloff, E.; Jones, R. T.; P, King; Kowalski, S.; Kurchaninov, L. L.; Lee, L.; McCreary, Amber; Mcdonald, Millie; Micherdzińska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Nelyubin, V.; Page, S. A.; Ramsay, W. D.; Solvignon, P.; Storey, D.; Tobias, W. A.; Urban, Erik; Vidal, C.; Waidyawansa, B.; Wang, P.; Zhamkotchyan, S.

doi:10.1016/j.physletb.2017.01.026

Cited by 18 publications

(9 citation statements)

References 17 publications

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“…and periodically with dedicated measurements using a Møller polarimeter [18]. Both were found to agree [19] during the experiment and yielded a combined polarization of P = 88.80 ± 0.55%.…”

supporting

confidence: 55%

First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement

Androic,

Armstrong,

Bartlett

et al. 2021

Preprint

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We report the first measurement of the parity-violating elastic electron scattering asymmetry on 27 Al. The 27 Al elastic asymmetry is APV = 2.16 ± 0.11 (stat) ± 0.16 (syst) ppm, and was measured at Q 2 = 0.02357 ± 0.0001 GeV 2 , θ lab = 7.61 • ± 0.02 • , and E lab = 1.157 GeV with the Q weak apparatus at Jefferson Lab. Predictions using a simple Born approximation as well as more sophisticated distorted-wave calculations are in good agreement with this result. From this asymmetry the 27 Al neutron radius Rn = 2.89 ± 0.12 fm was determined using a many-models correlation technique. The corresponding neutron skin thickness Rn − Rp = −0.04 ± 0.12 fm is small, as expected for a light nucleus with a neutron excess of only 1. This result thus serves as a successful benchmark for electroweak determinations of neutron radii on heavier nuclei. A tree-level approach was used to extract the 27 Al weak radius Rw = 3.00±0.15 fm, and the weak skin thickness R wk − R ch = −0.04 ± 0.15 fm. The weak form factor at this Q 2 is F wk = 0.39 ± 0.04.As beam properties and experimental techniques have improved over the last two decades, so has the preci-sion of parity-violating (PV) asymmetry measurements in elastic electron scattering. These experiments initially

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supporting

confidence: 55%

First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement

Androic,

Armstrong,

Bartlett

et al. 2021

Preprint

Self Cite

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“…Together with the known polarization of the polarimeter targets, the beam polarization can thus be extracted. Taking CEBAF at Jefferson Lab, for instance, there are three types of electron beam polarimeter which are Mott [453], Møller [454], and Compton [455], respectively, providing polarization measurements as precise as 1% at different positions along the beamline. The Compton polarimeter uses a highly polarized and high power laser as the scattering target which is noninvasive to the electron beam so that it can continuously monitor the beam polarization.…”

Section: Luminosity and Polarization Measurementsmentioning

confidence: 99%

Electron-ion collider in China

et al. 2021

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Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons as well as nuclei. As a future high energy nuclear physics project, an Electron-ion collider in China (EicC) has been proposed. It will be constructed based on an upgraded heavy-ion accelerator, High Intensity heavy-ion Accelerator Facility (HIAF) which is currently under construction, together with a new electron ring. The proposed collider will provide highly polarized electrons (with a polarization of ∼80%) and protons (with a polarization of ∼70%) with variable center of mass energies from 15 to 20 GeV and the luminosity of (2–3) × 1033 cm−2 · s−1. Polarized deuterons and Helium-3, as well as unpolarized ion beams from Carbon to Uranium, will be also available at the EicC.The main foci of the EicC will be precision measurements of the structure of the nucleon in the sea quark region, including 3D tomography of nucleon; the partonic structure of nuclei and the parton interaction with the nuclear environment; the exotic states, especially those with heavy flavor quark contents. In addition, issues fundamental to understanding the origin of mass could be addressed by measurements of heavy quarkonia near-threshold production at the EicC. In order to achieve the above-mentioned physics goals, a hermetical detector system will be constructed with cutting-edge technologies.This document is the result of collective contributions and valuable inputs from experts across the globe. The EicC physics program complements the ongoing scientific programs at the Jefferson Laboratory and the future EIC project in the United States. The success of this project will also advance both nuclear and particle physics as well as accelerator and detector technology in China.

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“…A test was performed during which both polarimeters made measurements, one right after the other, at the same beam current (≈4.5 µA) in order to verify that both devices gave the same result under the same beam conditions. 114 The results yielded good agreement within the respective uncertainties of the devices, although in this case the Compton polarimeter had a rather large statistical uncertainty (0.71%) due to operation at low beam current. An additional result of this test was that, when compared to nearby Compton measurements at high beam currents, the polarization was shown to not depend on beam current (at the 1% level) over a current range of 175 µA.…”

Section: Møller-compton Comparison At Jlab Hall Cmentioning

confidence: 54%

Precision electron beam polarimetry for next generation nuclear physics experiments

Aulenbacher

Chudakov

Gaskell

et al. 2018

Int. J. Mod. Phys. E

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Polarized electron beams have played an important role in scattering experiments at moderate to high beam energies. Historically, these experiments have been primarily targeted at studying hadronic structure -from the quark contribution to the spin structure of protons and neutrons, to nucleon elastic form factors, as well as contributions to these elastic form factors from (strange) sea quarks. Other experiments have aimed to place constraints on new physics beyond the Standard Model. For most experiments, knowledge of the magnitude of the electron beam polarization has not been a limiting systematic uncertainty, with only moderately precise beam polarimetry requirements. However, a new generation of experiments will require extremely precise measurements of the beam polarization, significantly better than 1%. This paper will review standard electron beam polarimetry techniques and possible future technologies, with an emphasis on the ever-improving precision that is being driven by the requirements of electron scattering experiments.

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A novel comparison of Møller and Compton electron-beam polarimeters

Cited by 18 publications

References 17 publications

First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement

First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement

Electron-ion collider in China

Precision electron beam polarimetry for next generation nuclear physics experiments

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