TY - JOUR
T1 - New insights into the laser produced electron-positron pairs
AU - Chen, Hui
AU - Nakai, M.
AU - Sentoku, Y.
AU - Arikawa, Y.
AU - Azechi, H.
AU - Fujioka, S.
AU - Keane, C.
AU - Kojima, S.
AU - Goldstein, W.
AU - Maddox, B. R.
AU - Miyanaga, N.
AU - Morita, T.
AU - Nagai, T.
AU - Nishimura, H.
AU - Ozaki, T.
AU - Park, J.
AU - Sakawa, Y.
AU - Takabe, H.
AU - Williams, G.
AU - Zhang, Z.
PY - 2013/6
Y1 - 2013/6
N2 - We report new results from the intense laser target interaction experiment that produces relativistic electron-positron pairs. Laser to electron energy transfer, inferred using x-ray and neutron measurements, was found to be consistent with the measured positrons. To increase the number of positrons, one needs to deliver a greater number of relativistic electrons from the laser-plasma interaction to the high Z gold target. A large preplasma was found to have a negative impact for this purpose, while the laser could produce hotter electrons in such preplasma. The peak energy shift in the positron spectrum is confirmed as the post-acceleration in the sheath potential behind the target. The results were supported by a collisional one-dimensional particle-in-cell code. This experiment was performed using the high-power LFEX laser at the Institute of Laser Engineering at Osaka University using a suite of diagnostics measuring electrons, positrons, x-rays and neutrons from the laser-target interaction at the relativistic regime.
AB - We report new results from the intense laser target interaction experiment that produces relativistic electron-positron pairs. Laser to electron energy transfer, inferred using x-ray and neutron measurements, was found to be consistent with the measured positrons. To increase the number of positrons, one needs to deliver a greater number of relativistic electrons from the laser-plasma interaction to the high Z gold target. A large preplasma was found to have a negative impact for this purpose, while the laser could produce hotter electrons in such preplasma. The peak energy shift in the positron spectrum is confirmed as the post-acceleration in the sheath potential behind the target. The results were supported by a collisional one-dimensional particle-in-cell code. This experiment was performed using the high-power LFEX laser at the Institute of Laser Engineering at Osaka University using a suite of diagnostics measuring electrons, positrons, x-rays and neutrons from the laser-target interaction at the relativistic regime.
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U2 - 10.1088/1367-2630/15/6/065010
DO - 10.1088/1367-2630/15/6/065010
M3 - Article
AN - SCOPUS:84879974137
VL - 15
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 065010
ER -