A5021245999- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Laser Design and Applications
- Advanced X-ray Imaging Techniques
- Ion-surface interactions and analysis
- Laser-Matter Interactions and Applications
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Advanced X-ray and CT Imaging
- Plasma Diagnostics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Astro and Planetary Science
- Medical Imaging Techniques and Applications
- Calibration and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Diamond and Carbon-based Materials Research
- Gamma-ray bursts and supernovae
- Optical Systems and Laser Technology
- Spacecraft and Cryogenic Technologies
- Advanced Surface Polishing Techniques
Sandia National Laboratories
2016-2025
Sandia National Laboratories California
2012-2022
The University of Texas at Austin
2007-2021
Lawrence Livermore National Laboratory
2021
University of Nevada, Reno
2010-2020
Sandia Research (United States)
2019
National Cheng Kung University
2018
University of Rochester
2018
Energetics (United States)
2018
Helmholtz-Zentrum Dresden-Rossendorf
2010-2015
The laminarity of high-current multi-MeV proton beams produced by irradiating thin metallic foils with ultraintense lasers has been measured. For energies >10 MeV, the transverse and longitudinal emittance are, respectively, <0.004 mm mrad <10(-4) eV s, i.e., at least 100-fold may be as much 10(4)-fold better than conventional accelerator beams. fast acceleration being electrostatic from an initially cold surface, only collisions accelerating electrons appear to limit beam laminarity. ion...
Collimated jets of carbon and fluorine ions up to 5 MeV/nucleon ( approximately 100 MeV) are observed from the rear surface thin foils irradiated with laser intensities x 10 (19)W/cm(2). The normally dominant proton acceleration could be surpressed by removing hydrocarbon contaminants resistive heating. This inhibits screening effects permits effective energy transfer other ion species. dynamics spatiotemporal distributions accelerating E fields at target inferred detailed spectra.
This Letter presents results from the first fully integrated experiments testing magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)], in which a cylinder of deuterium gas with preimposed 10 T axial magnetic field is heated by Z beamlet, 2.5 kJ, 1 TW laser, and magnetically imploded 19 MA, 100 ns rise time current on facility. Despite predicted peak implosion velocity only 70 km/s, fuel reaches stagnation temperature approximately 3 keV, Te≈Ti,...
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...
Pulsed power accelerators compress electrical energy in space and time to provide versatile experimental platforms for high density inertial confinement fusion science. The 80-TW “Z” pulsed facility at Sandia National Laboratories is the largest device world today. Z discharges up 22 MJ of stored its capacitor banks into a current pulse that rises 100 ns peaks as 30 MA low-inductance cylindrical targets. Considerable progress has been made over past 15 years use precision scientific tool....
We present the results of a detailed study on acceleration intense ion beams by relativistic laser plasmas. The experiments were performed at 100 TW Laboratoire pour L'Utilisation des Lasers Intenses. investigated dependence target conditions based theoretical predictions normal sheath mechanism. A strong beam parameters rear surface was found. succeeded in shaping appropriate tailoring geometry and we characterization quality. production heavy could be achieved suppressing amount protons...
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...
Magnetizing the fuel in inertial confinement fusion relaxes ignition requirements by reducing thermal conductivity and changing physics of burn product confinement. Diagnosing level magnetization during is critical to understanding target performance magneto-inertial (MIF) implosions. In pure deuterium plasma, 1.01 MeV tritons are emitted deuterium-deuterium can undergo secondary deuterium-tritium reactions before exiting fuel. Increasing elongates path lengths through some tritons,...
We present experimental results from the first systematic study of performance scaling with drive parameters for a magnetoinertial fusion concept. In magnetized liner inertial experiments, burn-averaged ion temperature doubles to 3.1 keV and primary deuterium-deuterium neutron yield increases by more than an order magnitude 1.1×10^{13} (2 kJ deuterium-tritium equivalent) through simultaneous increase in applied magnetic field (from 10.4 15.9 T), laser preheat energy 0.46 1.2 kJ), current...
Abstract We present an overview of the magneto-inertial fusion (MIF) concept Magnetized Liner Inertial Fusion (MagLIF) pursued at Sandia National Laboratories and review some most prominent results since initial experiments in 2013. In MagLIF, a centimeter-scale beryllium tube or ‘liner’ is filled with fuel, axially pre-magnetized, laser pre-heated, finally imploded using up to 20 MA from Z machine. All these elements are necessary generate thermonuclear plasma: preheating raises temperature...
The evolution of laser-generated MeV, MA electron beams propagating through conductors and insulators has been studied by comparing measurement modeling the distribution MeV protons that are sheath accelerated propagated electrons. We find flow metals is uniform can be laser imprinted, whereas propagation induces spatial disruption fast Agreement found with material dependent modeling.
The comparative efficiency and beam characteristics of high-energy ions generated by high-intensity short-pulse lasers (approximately 1-6 x 10(19) W/cm2) from both the front rear surfaces thin metal foils have been measured under identical conditions. Using direct measurements nuclear activation techniques, we find that rear-surface acceleration produces higher energy particles with smaller divergence a than front-surface acceleration. Our observations are well reproduced realistic...
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...
The magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)] utilizes a magnetic field and laser heating to relax the pressure requirements of confinement fusion. first experiments test [M. R. Gomez Rev. Lett. 113, 155003 (2014)] were conducted utilizing 19 MA, 100 ns Z machine, 2.5 kJ, 1 TW Beamlet laser, 10 T Applied B-field on system. Despite an estimated implosion velocity only 70 km/s in these experiments, electron ion temperatures at stagnation as...
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,...
X-ray imaging indicates magnetized liner inertial fusion (MagLIF) stagnation columns have a complicated quasi-helical structure with significant variations in x-ray brightness along the column. In this work, we describe MagLIF experiments aimed at controlling these structures by varying initial geometry and composition. First, aspect ratio of liner, demonstrate change that is consistent helical magneto Rayleigh–Taylor (MRT) instabilities feedthrough from outer-to-inner surfaces liner....
A beam of high energy ions and protons is observed from targets irradiated with intensities up to 5×1019 W/cm2. Maximum proton shown strongly correlate laser-irradiance on target. Energy spectra a magnetic spectrometer show plateau region near the maximum cutoff modulations in spectrum at approximately 65% energy. Presented two-dimensional particle-in-cell simulations suggest that are caused by presence multiple heavy-ion species expanding plasma.
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...
Magnetized Liner Inertial Fusion (MagLIF) is a magneto-inertial fusion concept, which presently being studied on the Z Pulsed Power Facility. The concept utilizes an axial magnetic field and laser heating to produce fusion-relevant conditions at stagnation despite peak magnetically driven implosion velocity of less than 100 km/s. Initial experiments demonstrated viability but left open questions about amount energy coupled fuel role that mix played in conditions. In this paper, simple...
Magnetized liner inertial fusion (MagLIF) experiments have demonstrated fusion-relevant ion temperatures up to 3.1 keV and thermonuclear production of 1.1 × 1013 deuterium–deuterium neutrons. This performance was enabled through platform development that provided increases in applied magnetic field, coupled preheat energy, drive current. Advanced coil designs with internal reinforcement an increase from 10 20 T. An improved laser pulse shape, beam smoothing, thinner entrance foils increased...
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. ,...
Since their discovery, laser accelerated ion beams have been the subject of great interest. The beam peak power and emittance is unmatched by any conventionally beam. Due to unique quality, a wealth applications has proposed, first experiments confirmed prospects. Laser acceleration strongly linked generation transport hot electrons interaction ultra-intense light with matter. Comparing at systems different parameters using targets varying thickness, material temperature, some insight on...
The maximum energy of protons that are accelerated forward by high-intensity, short-pulse lasers from either the front or rear surfaces thin metal foils is compared for a large range laser intensities and pulse durations. In regime moderately long durations (300–850fs), high [(1−6)×1019W∕cm2], rear-surface acceleration shown experimentally to produce higher particles with smaller divergence efficiency than front-surface acceleration. For similar but lower (2×1018Wcm−2), same conclusion...