Speaker
Liming Chen
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.2023.pdf
Gamma ray emission from wakefield accelerated electrons
wiggling in laser filed
L. M. Chen1,2, J. Feng1, Y. Ma1, K. Huang1, W. C. Yan1,2, J. Zhang1,2
1
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2
Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240,
China
Hard x-ray emission from fs laser produced plasmas have a number of interesting
applications in the dynamic probing of matter and in medical/biological imaging. Betatron
radiation is a highly collimated laser-driven hard x-ray source with fs duration which
generated by electron transversely oscillation during acceleration in underdense plasmas.
However, yield and photon energy of this source is always limited by controdictory between
parameters during electron acceleration.
Several methods were proposed by our team for the sake of improving quality of betatron
X-ray sources [1-3]. However, till now all popular methods are based on a single laser pulse,
which is in charge of electron acceleration and wiggling simultaneously. The efficiency of
betatron oscillation is limited in a comparably low level.
In order to overcome the radiation spectra peak limited to tens of keV, we present a new
method for high energy radiation emission via the accelerated electrons wiggling in an
additional laser field whose intensity is one order magnitude higher than the self generation
transverse field of the bubble, resulting the equivalent wiggler strength parameter K to
increase about twenty times. Fitting with synchrotron radiation, we acquired the brightness
for the case of laser wiggler field, which was 1.2×1023 ph/s/mrad2/mm2/0.1%BW at 1 MeV.
Such a high brilliant and ultra-fast gamma ray source could be applied to time-resolved
probing of the dense plasma and material, and the production of medical radioisotopes [4].
[1] W. C. Yan, L. M. Chen et al, PNAS 111, 5825(2014);
[2] Y. Ma, L. M. Chen et al, Sci. Rep. 6, 30491(2016)
[3] K. Huang, L. M. Chen et al, Sci. Rep. 6, 27633(2016)
[4] J. Feng, L. M. Chen et al, (submitted)
