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femtosecond γ-ray pulse

Laser and Particle Beams (1)

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Ultrashort-pulse MeV positron beam generation from intense Compton-scattering γ-ray source driven by laser wakefield acceleration
W. Luo, H.B. Zhuo, Y.Y. Ma, X.H. Yang, N. Zhao, M.Y. Yu
Journal:

Laser and Particle Beams / Volume 31 / Issue 1 / March 2013

Published online by Cambridge University Press:

20 December 2012, pp. 89-94
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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.