Characterization of escaping electrons from simulations of hot electron transport for intense femtosecond laser–target scenarios
Early experimental and analytical results for short-pulse, high intensity laser–target scenarios have claimed the existence of significant surface currents along the target edge due to hot electron confinement by electromagnetic surface fields. However, more recent fully integrated-explicit and hybr...
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| Veröffentlicht in: | Nuclear fusion 2010-09, Vol.50 (9), p.095002-095002 |
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| creator | Cottrill, L.A Kemp, A Tabak, M Town, R.P.J |
| description | Early experimental and analytical results for short-pulse, high intensity laser–target scenarios have claimed the existence of significant surface currents along the target edge due to hot electron confinement by electromagnetic surface fields. However, more recent fully integrated-explicit and hybrid-implicit particle-in-cell (PIC) simulations have revealed that surface confinement is only a minor effect. This discrepancy can be attributed to an observational effect; only a small fraction of electrons escape and they may not represent the bulk distribution. PIC simulations reveal that enhanced surface emission is largely dependent on target geometry and has only a minor dependence on laser incidence angle and/or the angular distribution of the hot electron birth distribution. Furthermore, the escape distribution appears to differ from the initial birth distribution primarily at low energies and is higher in temperature, which is significant for the interpretation of experimental measurements. |
| doi_str_mv | 10.1088/0029-5515/50/9/095002 |
| format | Article |
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(LLNL), Livermore, CA (United States)</creatorcontrib><title>Characterization of escaping electrons from simulations of hot electron transport for intense femtosecond laser–target scenarios</title><title>Nuclear fusion</title><description>Early experimental and analytical results for short-pulse, high intensity laser–target scenarios have claimed the existence of significant surface currents along the target edge due to hot electron confinement by electromagnetic surface fields. However, more recent fully integrated-explicit and hybrid-implicit particle-in-cell (PIC) simulations have revealed that surface confinement is only a minor effect. This discrepancy can be attributed to an observational effect; only a small fraction of electrons escape and they may not represent the bulk distribution. PIC simulations reveal that enhanced surface emission is largely dependent on target geometry and has only a minor dependence on laser incidence angle and/or the angular distribution of the hot electron birth distribution. 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| subjects | 70 PLASMA PHYSICS AND FUSION Birth CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS Confinement ENERGY PLANNING, POLICY AND ECONOMY ENGINEERING Exact sciences and technology Femtosecond Hot electrons Incidence angle Lasers Mathematical analysis Particle in cell technique Particle-in-cell method Physics Physics of gases, plasmas and electric discharges Physics of plasmas and electric discharges Plasma properties Plasma simulation Simulation Transport properties |
| title | Characterization of escaping electrons from simulations of hot electron transport for intense femtosecond laser–target scenarios |
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