Physics perspectives at JLab with a polarized positron beam

Voutier, E.

doi:10.1051/epjconf/20147308007

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…A unique feature of the proposed facility is the use of a superconducting linac to accelerate both protons and electrons, which considerably increases its physics potential. As described in [15,16], polarized electron and positron beams can be used to study the structure of composite particles and the dynamics of strong interactions, as well as to search for new physics beyond the Standard Model.…”

Section: Physics At the Proposed Facilitymentioning

confidence: 99%

“…Electron and positron beams, polarized and/or unpolarized, can be used to study the structure of composite particles and the dynamics of strong interactions, as well as to search for new physics beyond the Standard Model. A detailed description of the physics potential of a facility that can provide such beams (e.g., the upgraded CEBAF facility at Jefferson Lab or the proposed KEK superconducting linac) is presented in [15,16].…”

Section: Physics With Polarized Electrons and Positronsmentioning

confidence: 99%

“…Circularly polarized photons can also be produced by bremsstrahlung from polarized electrons [27]. Using polarized electrons and positrons, the nucleon electromagnetic form factors and generalized parton distributions can be determined in a model-independent way [16].…”

Section: Physics With Polarized Electrons and Positronsmentioning

confidence: 99%

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A Multi-MW Proton/Electron Facility at KEK

Belusević¹

2017

JAMP

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The main "bottleneck" limiting the beam power in circular machines is caused by space charge effects that produce beam instabilities. To increase maximally the beam power of a "proton driver", it is proposed to build a facility consisting solely of a 2.5 GeV injector linac (PI) and a 20 GeV pulsed superconducting linac (SCL). Such a facility could be constructed using the existing KEK accelerator infrastructure. The PI, based on the European Spallation Source (ESS) linac, would serve both as an injector to the SCL and a source of proton beams that could be used to copiously produce, e.g., muons and "cold" neutrons. Protons accelerated by the SCL would be transferred through the KEK Tristan ring in order to create neutrino, kaon and muon beams for fixed-target experiments. At a later stage, a 70 GeV proton synchrotron could be installed inside the Tristan ring. The SCL, comprising 1.3 GHz ILC-type rf cavities, could also accelerate polarized or unpolarized electron beams. After acceleration, electrons could be used to produce polarized positrons, or may traverse an XFEL undulator.

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Section: Physics At the Proposed Facilitymentioning

confidence: 99%

Section: Physics With Polarized Electrons and Positronsmentioning

confidence: 99%

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A Multi-MW Proton/Electron Facility at KEK

Belusević¹

2017

JAMP

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“…Positrons as a probe are used in solid state physics as well as in particle physics, covering an energy range from eV up to 250 GeV, respectively. The status of the field at low and medium energies and the need for improved positron beams have been stressed in several recent publications [1], [2], [3]. Ideally, the beam qualities should approach that of electron beams and in certain cases, polarized beams are needed, too.…”

Section: Introductionmentioning

confidence: 99%

A Method to Produce Intense Positron Beams via Electro Pair Production on Electrons

Schoch

2016

Preprint

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Intense positron beams can be prepared via electro production with the reaction e − + e − → e − + e + + e − + e − due to the availability of high current electron beams. Head on collisions inside of a magnetic field of a solenoid are used to produce unpolarized/polarized positrons via e − − e + -pair production. A flux of unpolarized positrons, Npositron = 6.55 • 10 11 s −1 , has been obtained as a result of calculations for a special case of parameters with beam currents for both electron beams of Ie=10 mA and beam momenta of p beam1 =0.63 MeV/c and p beam2 =10.0 MeV/c. Intensities are an order of magnitude smaller in the case of polarized positrons due to a reduced current of one of the electron beams. Suitable cuts on momenta of the positrons allow to achieve a polarization transfer from electrons to positrons of ≥ 85% reducing, however, the intensity to 27%.

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Photon polarization effects in polarized electron–positron pair production in a strong laser field

Dai

Shen

et al. 2021

Matter and Radiation at Extremes

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Deep understanding of the impact of photon polarization on pair production is essential for the efficient generation of laser-driven polarized positron beams and demands a complete description of polarization effects in strong-field QED processes. Employing fully polarization-resolved Monte Carlo simulations, we investigate correlated photon and electron (positron) polarization effects in the multiphoton Breit–Wheeler pair production process during the interaction of an ultrarelativistic electron beam with a counterpropagating elliptically polarized laser pulse. We show that the polarization of e−e+ pairs is degraded by 35% when the polarization of the intermediate photon is resolved, accompanied by an ∼13% decrease in the pair yield. Moreover, in this case, the polarization direction of energetic positrons at small deflection angles can even be reversed when high-energy photons with polarization parallel to the laser electric field are involved.

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Physics perspectives at JLab with a polarized positron beam

Cited by 3 publications

References 14 publications

A Multi-MW Proton/Electron Facility at KEK

A Multi-MW Proton/Electron Facility at KEK

A Method to Produce Intense Positron Beams via Electro Pair Production on Electrons

Photon polarization effects in polarized electron–positron pair production in a strong laser field

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