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Characterization of relativistic electron–positron beams produced with laser-accelerated GeV electrons

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Title
Characterization of relativistic electron–positron beams produced with laser-accelerated GeV electrons
Author(s)
Hoon Song; Chul Min Kim; Junho Won; Jaehyun Song; Seong Min Lee; Chnag Mo Ryu; Woosuk Bang; Chang Hee Nam
Publication Date
2023-01
Journal
Scientific Reports, v.13, no.1
Publisher
Nature Research
Abstract
The characterization of an electron–positron beam generated from the interaction of a multi-GeV electron beam with a lead plate is performed using GEANT4 simulations. The dependence of the positron beam size on driver electron beam energy and lead converter thickness is investigated in detail. A pancake-like positron beam structure is generated with a monoenergetic multi-GeV driver electron beam, with the results indicating that a 5 GeV driver electron beam with 1 nC charge can generate a positron beam with a density of 1015–1016 cm−3 at one radiation length of lead. In addition, we find that electron–positron beams generated using above-GeV electron beams have neutralities greater than 0.3 at one radiation length of lead, whereas neutralities of 0.2 are observed when using a 200 MeV electron beam. The possibility of observing plasma instabilities in experiments is also examined by comparing the plasma skin depth with the electron–positron beam size. A quasi-neutral electron–positron plasma can be produced in the interaction between a 1 nC, 5 GeV electron beam and lead with a thickness of five radiation lengths. Our findings will aid in analyzing and interpreting laser-produced electron–positron plasma for laboratory astrophysics research. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13004
DOI
10.1038/s41598-023-27617-0
ISSN
2045-2322
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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