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  Polarized Positron Beams via Intense Two-Color Laser Pulses

Chen, Y.-Y., He, P.-L., Shaisultanov, R., Hatsagortsyan, K. Z., & Keitel, C. H. (2019). Polarized Positron Beams via Intense Two-Color Laser Pulses. Physical Review Letters, 123(17): 174801. doi:10.1103/PhysRevLett.123.174801.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-E6CE-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-E6CF-0
Genre: Journal Article

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https://doi.org/10.1103/PhysRevLett.123.174801 (Publisher version)
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 Creators:
Chen, Yue-Yue1, Author              
He, Pei-Lun1, 2, Author              
Shaisultanov, Rashid1, Author              
Hatsagortsyan, Karen Zaven1, Author              
Keitel, Christoph H.1, Author              
Affiliations:
1Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society, ou_904546              
2Key Laboratory for Laser Plasmas, Ministry of Education, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China, ou_persistent22              

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Free keywords: Physics, Plasma Physics, physics.plasm-ph
 MPINP: Research group K. Z. Hatsagortsyan – Division C. H. Keitel
 Abstract: Generation of ultrarelativistic polarized positrons during interaction of an ultrarelativistic electron beam with a counterpropagating two-color petawatt laser pulse is investigated theoretically. Our Monte Carlo simulation based on a semi-classical model, incorporates photon emissions and pair productions, using spin-resolved quantum probabilities in the local constant field approximation, and describes the polarization of electrons and positrons for the pair production and photon emission processes, as well as the classical spin precession in-between. The main reason of the polarization is shown to be the spin-asymmetry of the pair production process in strong external fields, combined with the asymmetry of the two-color laser field. Employing a feasible scenario, we show that highly polarized positron beams, with a polarization degree of $\zeta\approx 60\%$, can be produced in a femtosecond time scale, with a small angular divergence, $\sim 74$ mrad, and high density $\sim 10^{14}$ cm$^{-3}$. The laser-driven positron source, along with laser wakefield acceleration, may pave the way to small scale facilities for high energy physics studies.

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 Dates: 2019-10-22
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: arXiv: 1904.04110
DOI: 10.1103/PhysRevLett.123.174801
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 123 (17) Sequence Number: 174801 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1