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Enhanced electron–positron pair production by ultra intense laser irradiating a compound target
- Source :
- Plasma Physics and Controlled Fusion. 58:125007
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- High-energy-density electron–positron pairs play an increasingly important role in many potential applications. Here, we propose a scheme for enhanced positron production by an ultra intense laser irradiating a gas-Al compound target via the multi-photon Breit–Wheeler (BW) process. The laser pulse first ionizes the gas and interacts with a near-critical-density plasma, forming an electron bubble behind the laser pulse. A great deal of electrons are trapped and accelerated in the bubble, while the laser front hole-bores the Al target and deforms its front surface. A part of the laser wave is thus reflected by the inner curved target surface and collides with the accelerated electron bunch. Finally, a large number of γ photons are emitted in the forward direction via the Compton back-scattering process and the BW process is initiated. Dense electron–positron pairs are produced with a maximum density of m−3. Simulation results show that the positron generation is greatly enhanced in the compound target, where the positron yield is two orders of magnitude greater than that in only the solid slab case. The influences of the laser intensity, gas density and length on the positron beam quality are also discussed, which demonstrates the feasibility of the scheme in practice.
- Subjects :
- Physics
Antiparticle
Photon
Electron bubble
business.industry
Plasma
Electron
Condensed Matter Physics
Laser
01 natural sciences
010305 fluids & plasmas
law.invention
Pair production
Positron
Optics
Nuclear Energy and Engineering
law
0103 physical sciences
Physics::Accelerator Physics
Atomic physics
010306 general physics
business
Subjects
Details
- ISSN :
- 13616587 and 07413335
- Volume :
- 58
- Database :
- OpenAIRE
- Journal :
- Plasma Physics and Controlled Fusion
- Accession number :
- edsair.doi...........d7364de2b46139610a94f306f12c8c88