Abstract
Laser based positron represents a new particle source with short pulse duration and high charge density. Positron production based on laser wakefield electron acceleration (LWFA) has been investigated theoretically in this paper. Analytical expressions for positron spectra and yield have been obtained through a combination of LWFA and cascade shower theories. The maximum positron yield and corresponding converter thickness have been optimized as a function of driven laser power. Under the optimal condition, high energy ($g100\text{ }\text{ }\mathrm{MeV}$) positron yield up to $5\ifmmode\times\else\texttimes\fi{}{10}^{11}$ can be produced by high power femtosecond lasers at ELI-NP. The percentage of positrons shows that a quasineutral electron-positron jet can be generated by setting the converter thickness greater than 5 radiation lengths.
Highlights
Since the chirped pulse amplification technique was proposed [1], there has been a large increase in the number of short-pulse, high-intensity laser facilities in the world
The maximum positron yield and corresponding converter thickness have been optimized as a function of driven laser power
The generation of high density and high energy electronpositron beams is a basic problem in astrophysics, which is similar to jets of long gamma-ray bursts
Summary
Since the chirped pulse amplification technique was proposed [1], there has been a large increase in the number of short-pulse, high-intensity laser facilities in the world. Combing laser plasma interaction with shower theory can help us to understand laser positron production and design optimal experimental conditions Within this framework, Myatt et al studied positron generation from kilojoule-class, high-intensity lasers irradiating solid targets [16]. In LWFA, the electron beams show different properties: quasimonoenergetic structure with peak energies of several hundreds of MeV to several GeV, low emittance, and low energy spread [22,23,24,25,26] Due to those large differences, the optimal condition cannot be extended to LWFA-based positron production directly.
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