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Research paper thumbnail of Study of fast electron propagation in ultraintense laser pulse interaction with solid targets from Optical Transition Radiation diagnostics

APS, Oct 1, 2000

In the context of the fast electron transport in solid matter and the fast ignitor scheme, we rep... more In the context of the fast electron transport in solid matter and the fast ignitor scheme, we report on time-integrated and -resolved measurements of the target back-side visible irradiance performed at LULI with the 100TW laser. From Optical Transition Radiation, we estimate the geometry of the high energy electron flux through the target, which also gives evidence of the material

Research paper thumbnail of Generation and Transport of Fast Electrons in Laser Irradiated Targets at Relativistic Intensities

AIP Conference Proceedings, 2002

The transport of relativistic electrons in solid targets irradiated by a short laser pulse at rel... more The transport of relativistic electrons in solid targets irradiated by a short laser pulse at relativistic intensities has been studied both experimentally and numerically. A Monte-Carlo collision code takes into account individual collisions with the ions and electrons in the target. A 3D-hybrid code takes into account these collisions as well as the generation of electric and magnetic fields and the self-consistent motion of the electrons in these fields. It predicts a magnetic guiding of a fraction of the fast electron current over long distances and a localized heating of the material along the propagation axis. In experiments performed at LULI on the 100 TW laser facility, several diagnostics have been implemented to diagnose the geometry of the fast electron transport and the target heating. The typical conditions were: £/<20 J, A= 1 um, r~300fs, 7~ 10 18-5.10 19 W/cm 2. The results indicate a modest heating of the target (typically 20-40 eV over 20 |um to 50 urn), consistent with an acceleration of the electrons inside a wide aperture cone along the laser axis.

Research paper thumbnail of Fast electron transport and heating in ultraintense laser pulse interaction with solid targets

In the context of the fast electron transport in solid matter and the fast ignitor scheme, we rep... more In the context of the fast electron transport in solid matter and the fast ignitor scheme, we report on results from ultraintense laser pulse interaction with thick targets. Experiments have been performed at LULI with the 100 TW CPA Nd:glass laser, at intensities up to a few 10^19 W/cm^2. Images obtained from classical and chirped-pulse time-resolved reflectometry diagnostics of the

Research paper thumbnail of Fast Electron Transport in Ultraintense Laser Pulse Interaction with Solid Targets by Rear-Side Self-Radiation Diagnostics

Physical Review Letters, 2002

We report on rear-side optical self-emission results from ultraintense laser pulse interactions w... more We report on rear-side optical self-emission results from ultraintense laser pulse interactions with solid targets. A prompt emission associated with a narrow electron jet has been observed up to aluminum target thicknesses of 400 mm with a typical spreading half-angle of 17 ±. The quantitative results on the emitted energy are consistent with models where the optical emission is due to transition radiation of electrons reaching the back surface of the target or due to a synchrotron-type radiation of electrons pulled back to the target. These models associated with transport simulation results give an indication of a temperature of a few hundred keV for the fast-electron population.

Research paper thumbnail of Study of Fast Electron Propagation in Ultra-Intense Laser Pulse Interaction with Solid Targets Using Rear Side Optical Self-Radiation and Reflectivity-Based Diagnostics

Atoms, Solids, and Plasmas in Super-Intense Laser Fields, 2001

Research paper thumbnail of Einstein e io

Research paper thumbnail of Study of fast electron propagation in ultraintense laser pulse interaction with solid targets from Optical Transition Radiation diagnostics

APS, Oct 1, 2000

In the context of the fast electron transport in solid matter and the fast ignitor scheme, we rep... more In the context of the fast electron transport in solid matter and the fast ignitor scheme, we report on time-integrated and -resolved measurements of the target back-side visible irradiance performed at LULI with the 100TW laser. From Optical Transition Radiation, we estimate the geometry of the high energy electron flux through the target, which also gives evidence of the material

Research paper thumbnail of Generation and Transport of Fast Electrons in Laser Irradiated Targets at Relativistic Intensities

AIP Conference Proceedings, 2002

The transport of relativistic electrons in solid targets irradiated by a short laser pulse at rel... more The transport of relativistic electrons in solid targets irradiated by a short laser pulse at relativistic intensities has been studied both experimentally and numerically. A Monte-Carlo collision code takes into account individual collisions with the ions and electrons in the target. A 3D-hybrid code takes into account these collisions as well as the generation of electric and magnetic fields and the self-consistent motion of the electrons in these fields. It predicts a magnetic guiding of a fraction of the fast electron current over long distances and a localized heating of the material along the propagation axis. In experiments performed at LULI on the 100 TW laser facility, several diagnostics have been implemented to diagnose the geometry of the fast electron transport and the target heating. The typical conditions were: £/<20 J, A= 1 um, r~300fs, 7~ 10 18-5.10 19 W/cm 2. The results indicate a modest heating of the target (typically 20-40 eV over 20 |um to 50 urn), consistent with an acceleration of the electrons inside a wide aperture cone along the laser axis.

Research paper thumbnail of Fast electron transport and heating in ultraintense laser pulse interaction with solid targets

In the context of the fast electron transport in solid matter and the fast ignitor scheme, we rep... more In the context of the fast electron transport in solid matter and the fast ignitor scheme, we report on results from ultraintense laser pulse interaction with thick targets. Experiments have been performed at LULI with the 100 TW CPA Nd:glass laser, at intensities up to a few 10^19 W/cm^2. Images obtained from classical and chirped-pulse time-resolved reflectometry diagnostics of the

Research paper thumbnail of Fast Electron Transport in Ultraintense Laser Pulse Interaction with Solid Targets by Rear-Side Self-Radiation Diagnostics

Physical Review Letters, 2002

We report on rear-side optical self-emission results from ultraintense laser pulse interactions w... more We report on rear-side optical self-emission results from ultraintense laser pulse interactions with solid targets. A prompt emission associated with a narrow electron jet has been observed up to aluminum target thicknesses of 400 mm with a typical spreading half-angle of 17 ±. The quantitative results on the emitted energy are consistent with models where the optical emission is due to transition radiation of electrons reaching the back surface of the target or due to a synchrotron-type radiation of electrons pulled back to the target. These models associated with transport simulation results give an indication of a temperature of a few hundred keV for the fast-electron population.

Research paper thumbnail of Study of Fast Electron Propagation in Ultra-Intense Laser Pulse Interaction with Solid Targets Using Rear Side Optical Self-Radiation and Reflectivity-Based Diagnostics

Atoms, Solids, and Plasmas in Super-Intense Laser Fields, 2001

Research paper thumbnail of Einstein e io

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