Generation of Positrons and Formation of Relativistic Jets with Ultra-intense Lasers

Details Generation of Positrons and Formation of Relativistic Jets with Ultra-intense Lasers Generation of Positrons and Formation of Relativistic Jets with Ultra-intense Lasers

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppgo2006t&link_type=abstract

American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre

Physics

Plasma Physics

Scientific paper

It has already been demonstrated at LLNL that ultra-intense lasers can generate a substantial amount of positron via interaction between hot electrons with energy more than several MeV and high Z nuclei. We have analyzed theoretically the physical processes to lead the generation of positrons and quantitatively studied by solving relativistic Fokker-Planck equations to the hot electrons. Our result may explain the experimental positron energy spectrum observed in LLNL. After such comparisons, we have carried out parameter study to see how many positron can be generated by varying parameters of laser and targets. As the next step, we have developed a two-dimensional relativistic hydrodynamic code to study a possibility of model experiment of electron-positron plasma jets seen in Active Galactic Nuclei (AGN) or near Black Holes. Since the positron is over thousand times lighter than an ion, the generated positron will expand with electron so as to keep charge neutrality. Then, we can generate baryon-free and relativistic electron-positron jets or fire-balls. We will discuss about how to collimate the electron-positron cloud to a form of jets. The properties of the relativistic jets in the laboratory are compared with those said to be in the Universe, for example, AGN jets.

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