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Trapping and acceleration of spin-polarized positrons from γ photon splitting in wakefields
- Source :
- Physical Review Research, Vol 4, Iss 2, p L022028 (2022)
- Publication Year :
- 2022
- Publisher :
- American Physical Society, 2022.
-
Abstract
- Energetic spin-polarized positrons are very useful for forefront research such as e^{−}e^{+} collider physics, but it is still quite challenging to generate such sources. Here, we propose an efficient scheme of trapping and accelerating polarized positrons in plasma wakefields. By developing a fully spin-resolved Monte Carlo method, we find that in the nonlinear Breit-Wheeler pair production the polarization of intermediate γ photons significantly affects the pair spin polarization, and ignoring this effect would result in an overestimation of the pair yield and polarization degree. In particular, seed electrons colliding with a bichromatic laser create polarized γ photons which split into e^{−}e^{+} pairs via the nonlinear Breit-Wheeler process with an average (partial) positron polarization above 30% (70%). Over 70% of positrons are then trapped and accelerated in the recovered wakefields driven by a hollow electron beam, obtaining an energy gain of 3.5 GeV/cm with slight depolarization. Our method provides the potential for constructing compact polarized positron sources for future applications and may also attract broad interest in strong-field physics, high-energy physics, and particle physics.
Details
- Language :
- English
- ISSN :
- 26431564
- Volume :
- 4
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- Physical Review Research
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.326789b273014ade8181e025820df0e0
- Document Type :
- article
- Full Text :
- https://doi.org/10.1103/PhysRevResearch.4.L022028