Efficient Propagation of Polarization from Laser Photons to Positrons through Compton Scattering and Electron-Positron Pair Creation

Omori, T.; Fukuda, Masafumi; Hirose, T.; Kurihara, Y.; Kuroda, R.; Nomura, Masahiro; Ohashi, A.; Okugi, T.; Sakaue, Kazuyuki; Saito, Taku; Urakawa, J.; Washio, Masakazu; Yamazaki, I.

doi:10.1103/physrevlett.96.114801

Cited by 108 publications

(66 citation statements)

References 9 publications

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“…To obtain polarized positron beams an additional circularly polarized laser pulse (counterpropagating with the electron bunch) may be used to generate longitudinally polarized gamma ray photons, which then collide with a thin film target [43].…”

Section: Discussionmentioning

confidence: 99%

On the Production of Flat Electron Bunches for Laser Wake Field Acceleration

Fukuda¹,

H²,

Koga³

et al. 2006

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We suggest a novel method for injection of electrons into the acceleration phase of particle accelerators, producing low emittance beams appropriate even for the demanding high energy Linear Collider specifications. In this paper we work out the injection into the acceleration phase of the wake field in a plasma behind a high intensity laser pulse, taking advantage of the laser polarization and focusing. With the aid of catastrophe theory we categorize the injection dynamics. The scheme uses the structurally stable regime of transverse wake wave breaking, when electron trajectory self-intersection leads to the formation of a flat electron bunch. As shown in threedimensional particle-in-cell simulations of the interaction of a laser pulse in a linefocus with an underdense plasma, the electrons, injected via the transverse wake wave breaking and accelerated by the wake wave, perform betatron oscillations with different amplitudes and frequencies along the two transverse coordinates. The polarization and focusing geometry lead to a way to produce relativistic electron bunches with asymmetric emittance (flat beam). An approach for generating flat laser accelerated ion beams is briefly discussed. † Also at A. M. Prokhorov

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Section: Discussionmentioning

confidence: 99%

On the Production of Flat Electron Bunches for Laser Wake Field Acceleration

Fukuda¹,

H²,

Koga³

et al. 2006

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“…Storage or damping rings can be used at high energy, taking advantage of the self-polarizing Sokolov-Ternov effect [11], however, this approach is generally not suitable for external beams and continuous wave injection facilities. Two schemes based on the e + e -pair creation process from circularly polarized photons [12,13] have been explored and investigated successfully: the Compton backscattering of polarized laser light from a GeV unpolarized electron beam [14], and synchrotron radiation of a multi-GeV unpolarized electron beam travelling within a helical undulator [15]. Both experiments demonstrated high positron polarization, confirming the transfer efficiency of the pair production process for a polarized positron.…”

Section: Peppo Based Polarized Positron Injectormentioning

confidence: 91%

“…The most, probably the only, challenging part is the generation of intense positron beams with high polarization. Several methods to create polarized positrons have been explored and/or applied at different circumstances [10,11,12,13,14,15]. However, each scheme has its own advantages and disadvantages, and does not satisfy the JLEIC injection and current requirements.…”

Section: Introductionmentioning

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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“…Here three variations of this latter concept are used. The Compton Linac scheme [16][17], the Compton ring scheme [18] [19] and the Compton ERL scheme [20] [21]. In each of these, an electron beam interacts with a powerful circularly polarized laser beam.…”

Section: Generation Of Polarized Positronmentioning

confidence: 99%

The Clic Electron and Positron Polarized Sources

Rinolfi

Variola²,

Liu³

et al. 2011

Polarized Sources, Targets and Polarimetry

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The CLIC polarized electron source is based on a DC gun where the photocathode is illuminated by a laser beam. Each micro-bunch has a charge of 6x10 9 e − , a width of 100 ps and a repetition rate of 2 GHz. A peak current of 10 A in the micro-bunch is a challenge for the surface charge limit of the photo-cathode. Two options are feasible to generate the 2 GHz e − bunch train: 100 ps micro-bunches can be extracted from the photo-cathode either by a 2 GHz laser system or by generating a macro-bunch using a ~200 ns laser pulse and a subsequent RF bunching system to produce the appropriate micro-bunch structure. Recent results obtained by SLAC, for the latter case, are presented. The polarized positron source is based on a positron production scheme in which polarized photons are produced by a laser Compton scattering process. The resulting circularly-polarized gamma photons are sent onto a target, producing pairs of longitudinally polarized electrons and positrons. The Compton backscattering process occurs either in a Compton ring, where a 1 GeV electron beam interacts with circularly-polarized photons in an optical resonator or in a 1.8 GeV Compton Energy Recovery Linac (ERL) or in a 6 GeV Linac with several optical cavities. The undulator scheme is also studied. The nominal CLIC e + bunch population is 6.7x10 9 particles per bunch at 200 MeV. The tradeoff between e + yield and level of polarization is an important topic. The overall scheme for both polarized electron and positron beams is described.

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Efficient Propagation of Polarization from Laser Photons to Positrons through Compton Scattering and Electron-Positron Pair Creation

Cited by 108 publications

References 9 publications

On the Production of Flat Electron Bunches for Laser Wake Field Acceleration

On the Production of Flat Electron Bunches for Laser Wake Field Acceleration

Polarized positrons in Jefferson lab electron ion collider (JLEIC)

The Clic Electron and Positron Polarized Sources

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