A5021951922- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser Material Processing Techniques
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Ocular and Laser Science Research
- Advanced Optical Sensing Technologies
- Atomic and Molecular Physics
Tel Aviv University
2019-2024
Intense lasers enable generating high-energy particle beams in university-scale laboratories. With the direct laser acceleration (DLA) method, leading part of pulse ionizes target material and forms a positively charged ion plasma channel into which electrons are injected accelerated. The high energy conversion efficiency DLA makes it ideal for large numbers photonuclear reactions. In this work, we reveal that, efficient to prevail, sufficiently atomic number is required maintain injection...
We present a new analytical model for the expansion of thin slab plasma into vacuum. By considering rising scale length during initial heating phase, we were able to give smooth quadratic behavior at origin while describing its exponentially falling density large distance. show this functional form be solution equations and validate predictions against numerical simulations experimental measurements. demonstrate applicability scenarios in which solid foils are turned tens micrometer-scale...
The versatility of laser accelerators in generating particle beams various types is often promoted as a key applicative advantage. These multiple particles, however, are generated on vastly different irradiation setups, so that switching from one type to another involves substantial mechanical changes. In this letter, we report laser-based accelerator generates either multi-MeV electrons or ions the same thin-foil setup. Switching generation achieved by introducing an auxiliary pulse, which...
Abstract Intense laser fields interact very differently with micrometric rough surfaces than flat objects. The interaction features high energy absorption and increased emission of MeV electrons, ions, hard x-rays. In this work, we irradiated isolated, translationally-symmetric objects in the form Au bars. resulted two forward-directed electron jets having a small opening angle, narrow spread range, positive angle to correlation. Our numerical simulations show that following ionization,...
Described is an experimental procedure that enables high-power laser irradiation of microfabricated targets. Targets are brought to the focus by a closed feedback loop operates between target manipulator and ranging sensor. The fabrication process explained in detail. Representative results MeV-level proton beams generated 600 nm thick gold foils at rate 0.2 Hz given. method compared with other replenishable systems prospects increasing shot rates above 10 discussed.
We report on an experimental study of proton acceleration by intense laser irradiation micrometric bar targets, whose dimensions are transversely immersed in the focal volume and longitudinally smaller than half its wavelength. Using only 120 mJ energy, we recorded energies excess 6 MeV, exceeding those reported with any other method a factor 3. 3D particle-in-cell simulations revealed that efficient energy transfer from diffracted fields to electrons both sides target, combined reduced...
Abstract Intense laser fields interact very differently with micrometric rough surfaces than flat objects. The interaction features high energy absorption and increased emission of MeV electrons, ions, hard x-rays. In this work, we irradiated isolated, translationally-symmetric objects in the form Au bars. resulted two forward-directed electron jets having a small opening angle, narrow spread range, positive angle to correlation. Our numerical simulations show that following ionization,...
For the past two decades, intense lasers have supported new schemes for generating high-energy particle beams in university-scale laboratories. With direct laser acceleration (DLA) method, leading part of pulse ionizes target material and forms a positively charged ion plasma channel into which electrons are injected accelerated. DLA has been realized over wide range parameters, using low-atomic-number materials. In this presented work we reveal that at these higher intensities, edge...
Described is an experimental procedure that enables high-power laser irradiation of microfabricated targets. Targets are brought to the focus by a closed feedback loop operates between target manipulator and ranging sensor. The fabrication process explained in detail. Representative results MeV-level proton beams generated 600 nm thick gold foils at rate 0.2 Hz given. method compared with other replenishable systems prospects increasing shot rates above 10 discussed.