First electron-positron pair experiments using the Osaka LFEX laser
ORAL
Abstract
The first laser driven electron-positron experiment using the high power LFEX laser at the Osaka University was performed by a collaborative group from LLNL and ILE. Together with high energy electrons (T$_{hot}\sim $10 MeV), relativistic positrons ($\sim $10 MeV) were observed from 1 kJ shots with laser intensity at about 10$^{20}$ W/cm$^2$ on 1 mm thick gold target. Electron accelerations in plasmas with density below critical were shown to play an important role in producing very high energy ($>$20 MeV) electrons, while the number of relatively low energy electrons ($\sim $10 MeV) appeared to be crucial to the total number of pairs produced. Detailed experiment results and simulations will be presented in this talk (by Dr. M. Nakai).
*This work was performed under the auspices of the U.S. DOE by LLNL under Contract DE-AC52-07NA27344 and LDRD (\#12-ERD-062), and partially funded by ILE's Joint research program.
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