The interaction of ultra-intense high-power lasers with solid-state targets has been largely studied for the past 20 years as a future compact proton and ion source.Indeed,the huge potential established on the target ...The interaction of ultra-intense high-power lasers with solid-state targets has been largely studied for the past 20 years as a future compact proton and ion source.Indeed,the huge potential established on the target surface by the escaping electrons provides accelerating gradients of TV/m.This process,called target normal sheath acceleration,involves a large number of phenomena and is very difficult to study because of the picosecond scale dynamics.At the SPARC LAB Test Facility,the high-power laser FLAME is employed in experiments with solid targets,aiming to study possible correlations between ballistic fast electrons and accelerated protons.In detail,we have installed in the interaction chamber two different diagnostics,each one devoted to characterizing one beam.The first relies on electro-optic sampling,and it has been adopted to completely characterize the ultrafast electron components.On the other hand,a time-of-flight detector,based on chemical-vapour-deposited diamond,has allowed us to retrieve the proton energy spectrum.In this work,we report preliminary studies about simultaneous temporal resolved measurements of both the first forerunner escaping electrons and the accelerated protons for different laser parameters.展开更多
Interaction between high-intensity lasers with solid targets is the key process in a wide range of novel laser-based particle accelerator schemes,as well as electromagnetic radiation sources.Common to all the processe...Interaction between high-intensity lasers with solid targets is the key process in a wide range of novel laser-based particle accelerator schemes,as well as electromagnetic radiation sources.Common to all the processes is the generation of femtosecond pulses of relativistic electrons emitted from the targets as forerunners of the later-time principal products of the interaction scheme.In this paper,some diagnostics employed in laser–solid matter interaction experiments related to electrons,protons,ions,electromagnetic pulses(EMPs)and X-rays are reviewed.Then,we present our experimental study regarding fast electrons and EMPs utilizing a femtosecond-resolution detector previously adopted only in accelerator facilities.展开更多
Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration.Here we demonstrate an approach that enables us to contro...Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration.Here we demonstrate an approach that enables us to control the morphology of amorphous solid water(ASW)microstructured targets,by deposition of water vapor on a charged substrate,cooled down to 100 K.The morphology of the deposited ASW structures is controlled by varying the surface charge on the substrate and the pressure of water vapor.The obtained target is structured as multiple,dense spikes,confined by the charged area on the substrate,with increased aspect ratio of up to 5:1 and having a diameter comparable with the typical spot size of the laser focused onto the target.展开更多
文摘The interaction of ultra-intense high-power lasers with solid-state targets has been largely studied for the past 20 years as a future compact proton and ion source.Indeed,the huge potential established on the target surface by the escaping electrons provides accelerating gradients of TV/m.This process,called target normal sheath acceleration,involves a large number of phenomena and is very difficult to study because of the picosecond scale dynamics.At the SPARC LAB Test Facility,the high-power laser FLAME is employed in experiments with solid targets,aiming to study possible correlations between ballistic fast electrons and accelerated protons.In detail,we have installed in the interaction chamber two different diagnostics,each one devoted to characterizing one beam.The first relies on electro-optic sampling,and it has been adopted to completely characterize the ultrafast electron components.On the other hand,a time-of-flight detector,based on chemical-vapour-deposited diamond,has allowed us to retrieve the proton energy spectrum.In this work,we report preliminary studies about simultaneous temporal resolved measurements of both the first forerunner escaping electrons and the accelerated protons for different laser parameters.
文摘Interaction between high-intensity lasers with solid targets is the key process in a wide range of novel laser-based particle accelerator schemes,as well as electromagnetic radiation sources.Common to all the processes is the generation of femtosecond pulses of relativistic electrons emitted from the targets as forerunners of the later-time principal products of the interaction scheme.In this paper,some diagnostics employed in laser–solid matter interaction experiments related to electrons,protons,ions,electromagnetic pulses(EMPs)and X-rays are reviewed.Then,we present our experimental study regarding fast electrons and EMPs utilizing a femtosecond-resolution detector previously adopted only in accelerator facilities.
文摘Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration.Here we demonstrate an approach that enables us to control the morphology of amorphous solid water(ASW)microstructured targets,by deposition of water vapor on a charged substrate,cooled down to 100 K.The morphology of the deposited ASW structures is controlled by varying the surface charge on the substrate and the pressure of water vapor.The obtained target is structured as multiple,dense spikes,confined by the charged area on the substrate,with increased aspect ratio of up to 5:1 and having a diameter comparable with the typical spot size of the laser focused onto the target.
