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Ultrashort-pulse MeV positron beam generation from intense Compton-scattering γ-ray source driven by laser wakefield acceleration

Published online by Cambridge University Press:  20 December 2012

W. Luo ,
H.B. Zhuo ,
Y.Y. Ma ,
X.H. Yang ,
N. Zhao  and
M.Y. Yu
W. Luo*
Affiliation:
College of Science, National University of Defense Technology, Changsha, China College of Nuclear Science and Technology, University of South China, Hengyang, China
H.B. Zhuo*
Affiliation:
College of Nuclear Science and Technology, University of South China, Hengyang, China Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang, China
Y.Y. Ma
Affiliation:
College of Nuclear Science and Technology, University of South China, Hengyang, China Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang, China
X.H. Yang
Affiliation:
College of Nuclear Science and Technology, University of South China, Hengyang, China
N. Zhao
Affiliation:
College of Nuclear Science and Technology, University of South China, Hengyang, China
M.Y. Yu
Affiliation:
Institute for Fusion Theory and Simulation, Department of Physics, Zhejiang University, Hangzhou, China Theoretical Physics I, Ruhr University, Bochum, Germany
*
Address correspondence and reprint requests to: H.B. Zhuo and W. Luo, College of Science, National University of Defense Technology, Changsha 410073, China. E-mail: hongbin.zhuo@gmail.com, hongbin.zhuo@gmail.com
Address correspondence and reprint requests to: H.B. Zhuo and W. Luo, College of Science, National University of Defense Technology, Changsha 410073, China. E-mail: hongbin.zhuo@gmail.com, hongbin.zhuo@gmail.com
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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.

Keywords

Compton scatteringFemtosecond γ-ray pulseLaser wakefield accelerationPositron beamUltrashort
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 1 , March 2013 , pp. 89 - 94
Copyright
Copyright © Cambridge University Press 2012

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