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- Title
Ultrashort-pulse MeV positron beam generation from intense Compton-scattering γ-ray source driven by laser wakefield acceleration.
- Authors
Luo, W.; Zhuo, H.B.; Ma, Y.Y.; Yang, X.H.; Zhao, N.; Yu, M.Y.
- Abstract
Intense Compton-scattering γ-ray radiation driven by laser wakefield acceleration (LWFA) and generation of ultrashort positron beams are investigated by Monte Carlo simulation. Using an LWFA driven GeV electron bunch and a 45 femtosecond, 90 mJ/pulse, and 10 Hz Ti:Sapphire laser for driving the Compton scattering, fs γ-ray pulses were generated. The latter have a flux of ≥108/s, peak brightness of ≥1020 photons/(s mm2 mrad2 0.1% bandwidth), and photon energy of 5.9 to 23.2 MeV. The γ-ray pulses then impinge on a thin high-Z target. More than 107 positrons/s in the form of sub-100 fs pulses at several MeV can be produced. Such ultrashort positron pulses can be useful as the pump-probe type positron annihilation spectroscopy as well as in other applications.
- Subjects
POSITRON beams; ULTRASHORT laser pulses; MONTE Carlo method; TITANIUM; PHOTONS; POSITRON annihilation
- Publication
Laser & Particle Beams, 2013, Vol 31, Issue 1, p89
- ISSN
0263-0346
- Publication type
Article
- DOI
10.1017/S0263034612000948