A5031512728- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
- X-ray Spectroscopy and Fluorescence Analysis
- Gamma-ray bursts and supernovae
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- Astro and Planetary Science
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Space Satellite Systems and Control
- Radiomics and Machine Learning in Medical Imaging
- Particle accelerators and beam dynamics
- Pulsed Power Technology Applications
- X-ray Diffraction in Crystallography
- Advanced Optical Sensing Technologies
- Nuclear Materials and Properties
Marvel Fusion
2021-2024
Sandia National Laboratories
2013-2024
Fusion (United States)
2015-2024
Marvell (Israel)
2022-2024
Fusion Academy
2022-2024
Sandia National Laboratories California
2010-2019
Technical University of Darmstadt
2005-2017
University of Michigan
2017
Los Alamos National Laboratory
2010-2015
Helmholtz-Zentrum Dresden-Rossendorf
2010-2015
Neutrons are unique particles to probe samples in many fields of research ranging from biology material sciences engineering and security applications. Access bright, pulsed sources is currently limited large accelerator facilities there has been a growing need for compact over the recent years. Short pulse laser driven neutron could be relatively cheap way produce neutrons with energies excess 10 MeV. For more than decade experiments have tried obtain numbers sufficient Our demonstrated an...
This article reports on an experimental method to fully reconstruct laser-accelerated proton beam parameters called radiochromic film imaging spectroscopy (RIS). RIS allows for the characterization of beams concerning real and virtual source size, envelope- microdivergence, normalized transverse emittance, phase space, spectrum. technique requires particular targets a high resolution detector. Therefore thin gold foils with microgrooved rear side were manufactured characterized. Calibrated...
This Letter demonstrates the transporting and focusing of laser-accelerated 14 MeV protons by permanent magnet miniature quadrupole lenses providing field gradients up to $500\text{ }\text{ }\mathrm{T}/\mathrm{m}$. The approach is highly reproducible predictable, leading a focal spot $(286\ifmmode\times\else\texttimes\fi{}173)\text{ }\ensuremath{\mu}\mathrm{m}$ full width at half maximum 50 cm behind source. It decouples relativistic laser-proton acceleration from beam transport, paving way...
We present experimental results showing a laser-accelerated proton beam maximum energy cutoff of 67.5 MeV, with more than 5 × 106 protons per MeV at that energy, using flat-top hollow microcone targets. This result was obtained modest laser ∼80 J, on the high-contrast Trident Los Alamos National Laboratory. From 2D particle-in-cell simulations, we attribute source these enhanced energies to direct laser-light-pressure acceleration electrons along inner cone wall surface, where light wave...
We examine a regime in which linearly polarized laser pulse with relativistic intensity irradiates sub-critical plasma for much longer than the characteristic electron response time. A steady-state channel is formed this case quasi-static transverse and longitudinal electric fields. These relatively weak fields significantly alter dynamics. The field reduces dephasing between wave, leading to an enhancement of energy gain from pulse. ultimately limited by superluminosity wave fronts induced...
Laser-produced proton beams have been used to achieve ultrafast volumetric heating of carbon samples at solid density. The isochoric melting was probed by a scattering x rays from secondary laser-produced plasma. From the signal, we deduced fraction material that melted inhomogeneous heating. results are compared different theoretical approaches for equation state which suggests modifications standard models.
A new mechanism is reported that increases electron energy gain from a laser beam of ultrarelativistic intensity in underdense plasma. The increase occurs when the produces an ion channel confines accelerated electrons. frequency oscillations across strongly modulated by beam, which causes parametric amplification and enhances gain. This has threshold determined product density.
This article reports on the development and application of a Thomson parabola (TP) equipped with (90×70) mm2 microchannel-plate (MCP) for analysis laser-accelerated ions, produced by high-energy, high-intensity laser system. The MCP allows an online measurement ions in every single shot. An electromagnet instead permanent magnets is used that tuning magnetic field to adapt strength analyzed ion species energy. We describe recent experiments at 100 TW facility Laboratoire d’Utilization des...
Abstract High-intensity lasers interacting with solid foils produce copious numbers of relativistic electrons, which in turn create strong sheath electric fields around the target. The proton beams accelerated such have remarkable properties, enabling ultrafast radiography plasma phenomena or isochoric heating dense materials. In view longer-term multidisciplinary purposes (e.g., spallation neutron sources cancer therapy), current challenge is to achieve energies well excess 100 MeV,...
Los Alamos National Laboratory short pulse experiments have shown using various target cleaning techniques such that heavy ion beams of different charge states can be produced. Furthermore, by controlling the thickness light ions on rear target, monoenergetic pulses generated. The spectral shape accelerated particles controlled to yield a range distributions, from Maxwellian ones possessing peak at high energy. key lies in understanding and utilizing surface chemistry. Careful monitoring...
Recent experiments in the Trident laser facility (Los Alamos National Laboratory) have shown that hollow conical targets with a flat top at tip can enhance maximum energy of proton beams created during interaction an ultra-intense short pulse target (Gaillard S A et al 2011 Phys. Plasmas 18 056710). The energies been seen these are highest observed so far laser-driven acceleration. This is attributed to new acceleration mechanism, direct light pressure electrons (DLLPA), which increases...
A long laser beam propagating through an underdense plasma produces a positively charged ion channel by expelling electrons in the transverse direction. We consider dynamics of test electron resulting two-dimensional under action field and electric channel. considerable enhancement axial momentum can be achieved this case via amplification betatron oscillations. It is shown that oscillations parametrically amplified when frequency, which increases with wave amplitude, becomes comparable to...
High energy heavy ions were generated in laser produced plasma at moderate energy, with a large focal spot size of 0.5 mm diameter. The beam was provided by the 10 GW GSI-NHELIX systems, and observed spectroscopically status nascendi high spatial spectral resolution. Due to geometry, jet formed, containing ions. velocity distribution measured via an observation Doppler shifted characteristic transition lines. up 3 MeV F-ions deviates order magnitude from well-known Gitomer (Gitomer et al. ,...
Ion-driven fast ignition (IFI) may have significant advantages over electron-driven FI due to the potentially large reduction in amount of energy required for beam and laser driver. Recent experiments at Los Alamos National Laboratory’s Trident facility employing novel Au flat-top cone targets produced a fourfold increase laser-energy ion-energy efficiency, 13-fold number ions above 10MeV, few times maximum ion compared flat-foil targets. Compared recently published scaling laws, these gains...
This article reports about controlling laser-accelerated proton beams with respect to beam divergence and energy. The particles are captured by a pulsed high field solenoid magnetic strength of 8.6 T directly behind flat target foil that is irradiated intensity laser pulse. Proton energies around 2.3 MeV particle numbers 1012 could be collimated transported over distance more than 300 mm. In contrast the protons comoving electrons strongly deflected field. They propagate at submillimeter...
We present a full characterization of short pulse laser-driven neutron source. Neutrons are produced by nuclear reactions ions deposited in secondary target. The emission neutrons is superposition an isotropic component into 4π and forward directed, jet-like contribution, with energies ranging up to 80 MeV. A maximum flux 4.4 × 109 neutrons/sr has been observed used for fast radiography. On-shot the ion driver beam done variety different diagnostics, including particle detectors, reaction,...
An improved method to unfold the space-resolved proton energy distribution function of laser-accelerated beams using a layered, radiochromic film (RCF) detector stack has been developed. The takes into account reduced RCF response near Bragg peak due high linear transfer (LET). This LET dependence active layer measured, and published data have re-interpreted find nonlinear saturation scaling with stopping power. Accounting for effect increased integrated particle yield by 25% after...
High-energy short-pulse lasers are pushing the limits of plasma-based particle acceleration, x-ray generation, and high-harmonic generation by creating strong electromagnetic fields at laser focus where electrons being accelerated to relativistic velocities. Understanding electron dynamics is key for an accurate interpretation measurements. We present a unified self-consistent modeling approach in quantitative agreement with measurements differing trends across multiple target types acquired...
The Crystal Backlighter Imager (CBI) is a quasi-monochromatic, near-normal incidence, spherically bent crystal imager developed for the National Ignition Facility (NIF), which will allow inertial confinement fusion capsule implosions to be radiographed close stagnation. This not possible using standard pinhole-based area-backlighter configuration, as self-emission from hotspot overwhelms backlighter signal in final stages of implosion. CBI mitigates broadband hot spot by extremely narrow...
Energetic ions have been observed since the very first laser-plasma experiments.Their origin was found to be charge separation of electrons heated by thelaser, which transfers energy accelerated in field. The adventof ultra-intense lasers with pulse lengths femtosecond regime resulted inthe discovery energetic characteristics quite different fromthose driven long-pulse lasers. Discovered late 1990s, these ion beamshave become focus intense research worldwide, because their uniqueproperties...
Emerging approaches to short-pulse laser-driven neutron production offer a possible gateway compact, low cost, and intense broad spectrum sources for wide variety of applications. They are based on energetic ions, driven by an laser, interacting with converter material produce neutrons via breakup nuclear reactions. Recent experiments performed the high-contrast laser at Trident facility Los Alamos National Laboratory have demonstrated ion acceleration mechanism operating in regime...
The experimental data presented in this paper address the energy loss determination for argon at 4 MeV/u projectile laser-generated carbon plasma covering a huge parameter range density and temperature. Furthermore, consistent theoretical description of charge state evolution via Monte Carlo code is combined with an improved version CasP that allows us to calculate contributions stopping power bound free electrons each state. This approach gets rid any effective power. Comparison results...
Abstract The two-temperature, 2D hydrodynamic code Hydro–ELectro–IOnization–2–Dimensional (HELIO2D), which takes into account self-consistently the laser energy absorption in a target, ionization, heating, and expansion of created plasma is elaborated. wide-range two-temperature equation state developed used to model metal target dynamics from room temperature conditions weakly coupled plasma. simulation results are compared demonstrated good agreement with experimental data on Mg being...
The size, temporal and spatial shape, energy content of a laser pulse for the pre-heat phase magneto-inertial fusion affect ability to penetrate window laser-entrance-hole heat fuel behind it. High intensities dense targets are subject laser-plasma-instabilities (LPI), which can lead an effective loss or pronounced heating areas that should stay unexposed. While this problem has been many studies over last decades, investigated parameters were typically geared towards traditional driven...