Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies

Abbott, D.; Adderley, P.; Adeyemi, Adeleke; Aguilera, P.; Ali, Mortuza; Areti, H.; Baylac, M.; Benesch, J.; Bosson, G.; Cade, B.; Camsonne, A.; Cardman, L.; Clark, J. A.; Cole, P. L.; Covert, S.; Cuevas, C.; Dadoun, O.; Dale, D.; Dong, Hai; Dumas, J.; Fanchini, E.; Forest, T. A.; Forman, Eric; Freyberger, A.; Froidefond, E.; Golge, S.; Grames, Joseph; Guèye, P.; Hansknecht, J.; Harrell, Percy; Hoskins, J. R.; Hyde, Charles; Josey, Brian; Kazimi, R.; Kim, Y.; Machie, D.; Mahoney, K.; Mammei, R.; Marton, M.; McCarter, J. L.; McCaughan, M.; McHugh, M. J.; McNulty, D.; Mesick, K. E.; Michaelides, T.; Michaels, R.; Moffit, B.; Moser, Daniel; Camacho, C. Muñoz; Muraz, J.F.; Opper, A. K.; Poelker, M.; Réal, J. S.; Richardson, L. M.; Setiniyaz, Sadiq; Stutzman, Marcy; Suleiman, R.; Tennant, Chris; Tsai, Cheng-Ying; Turner, D. L.; Ungaro, M.; Variola, A.; Voutier, E.; Wang, Y.; Zhang, Y.

doi:10.1103/physrevlett.116.214801

Cited by 97 publications

(57 citation statements)

References 18 publications

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“…In fact, precise measurements of spin-dependent processes enable searches of physics beyond the Standard Model that can compete with direct searches at high-energy accelerators [5]. In addition to their intrinsic interest, polarized electron beams can also be employed to generate polarized beams of photons [6] and positrons [7] which, in turn, can be employed to address long-standing problems such as the matter-antimatter asymmetry in the Universe.…”

mentioning

confidence: 99%

“…Other methods based on spin filters [16], Stern-Gerlach-like beam splitters [17], and radiative polarization [18] also yield relatively low currents. The low attainable electric currents noticeably limit experiments with polarized beams [1][2][3] as well as the flux and the brightness of the polarized photon and positron beams attainable from polarized electron beams [6,7].…”

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confidence: 99%

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Polarized Laser-WakeField-Accelerated Kiloampere Electron Beams

2019

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High-flux polarized particle beams are of critical importance for the investigation of spin-dependent processes, such as in searches of physics beyond the Standard Model, as well as for scrutinizing the structure of solids and surfaces in material science. Here we demonstrate that kiloampere polarized electron beams can be produced via laser-wakefield acceleration from a gas target. A simple theoretical model for determining the electron beam polarization is presented and supported with self-consistent three-dimensional particle-in-cell simulations that incorporate the spin dynamics. By appropriately choosing the laser and gas parameters, we show that the depolarization of electrons induced by the laser-wakefield-acceleration process can be as low as 10%. Compared to currently available sources of polarized electron beams, the flux is increased by four orders of magnitude.

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confidence: 99%

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confidence: 99%

Polarized Laser-WakeField-Accelerated Kiloampere Electron Beams

2019

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“…This opens access to polarized positon beams to a wide community and without creating a highly radioactive environment. The experiment demonstrates highly efficient transfer of polarization from 8.19 MeV/c primary electrons to the produced positrons [18].…”

Section: Introductionmentioning

confidence: 92%

“…A new approach, referred to as Polarized Electrons for Polarized Positrons (PEPPo) technique [16,17,18], has been investigated at the CEBAF of the Thomas Jefferson National Accelerator Facility. Taking advantage of advances in high polarization, high intensity electron sources [28], it exploits the fact that polarized photons generated by the bremsstrahlung radiation of low energy longitudinally polarized electrons within a high-Z target produce polarized e + e --pairs.…”

Section: Peppo Based Polarized Positron Injectormentioning

confidence: 99%

Polarized positrons in Jefferson lab electron ion collider (JLEIC)

Lin

Grames

Guo

et al. 2018

AIP Conference Proceedings

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Abstract. The Jefferson Lab Electron Ion Collider (JLEIC) is designed to provide collisions of electron and ion beamswith high luminosity and high polarization to reach new frontier in exploration of nuclear structure. The luminosity, exceeding 10 33 cm -2 s -1 in a broad range of the center-of-mass (CM) energy and maximum luminosity above 10 34 cm -2 s -1 , is achieved by high-rate collisions of short small-emittance low-charge bunches with proper cooling of the ion beam and synchrotron radiation damping of the electron beam. The polarization of light ion species (p, d, 3 He) and electron can be easily preserved, manipulated and maintained by taking advantage of the unique figure-8 shape rings. With a growing physics interest, polarized positron-ion collisions are considered to be carried out in the JLEIC to offer an additional probe to study the substructure of nucleons and nuclei. However, the creation of polarized positrons with sufficient intensity is particularly challenging. We propose a dedicated scheme to generate polarized positrons. Rather than trying to accumulate "hot" positrons after conversion, we will accumulate "cold" electrons before conversion. Charge accumulation additionally provides a novel means to convert high repetition rate (>100 MHz) electron beam from the gun to a low repetition rate (<100 MHz) positron beam for broad applications. In this paper, we will address the scheme, provide preliminary estimated parameters and explain the key areas to reach the desired goal.

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“…The charge lifetime for a polarized gun also needs to be improved an order of magnitude for a realistic polarized electron source for the proposed cost effective ERL based EIC [17]. A high current polarized electron source can also be used in producing a high intensity polarized positron beam, which can be used in various collider applications [18].…”

Section: Introductionmentioning

confidence: 99%

Increasing charge lifetime in dc polarized electron guns by offsetting the anode

Rahman

Wang

Ben‐Zvi

et al. 2019

Phys. Rev. Accel. Beams

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Charge lifetime of strained superlattice GaAs photocathodes in DC guns is limited by ion back bombardment. It needs to be improved at least an order of magnitude to meet the requirements for future colliders such as Electron-Ion Collider (EIC). In this work, we propose and present simulation results for an offset anode scheme to increase charge lifetime in DC guns. This scheme eliminates the bombardment of high energy ions on the cathode and enables maximum usage of the available cathode area. Depending on the size of the available cathode area, this method can increase the charge lifetime by an order of magnitude compared to the current best alternative method. An anode assembly capable of in-vacuum movement is required for this method, which has been designed and fabricated at Brookhaven National Laboratory.

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Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies

Cited by 97 publications

References 18 publications

Polarized Laser-WakeField-Accelerated Kiloampere Electron Beams

Polarized Laser-WakeField-Accelerated Kiloampere Electron Beams

Polarized positrons in Jefferson lab electron ion collider (JLEIC)

Increasing charge lifetime in dc polarized electron guns by offsetting the anode

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