Short wavelength x‐ray laser research at the Lawrence Livermore National Laboratory

1992 ◽  
Vol 4 (7) ◽  
pp. 2326-2337 ◽  
Author(s):  
B. J. MacGowan ◽  
L. B. Da Silva ◽  
D. J. Fields ◽  
C. J. Keane ◽  
J. A. Koch ◽  
...  
Keyword(s):  
Short Wavelength ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
X Ray

scholarly journals X-Ray Holography at Lawrence Livermore National Laboratory

1992 ◽  
pp. 255-258
Author(s):  
J. Trebes ◽  
C. Annese ◽  
D. Birdsall ◽  
J. Brase ◽  
J. Gray ◽  
...  
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
X Ray

Analytical X-Ray Safety at Lawrence Livermore National Laboratory

1986 ◽  
Vol 30 ◽  
pp. 583-594
Author(s):  
P. L. Wallace
Keyword(s):  
Control System ◽  
Materials Science ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
National Average ◽  
Science Department ◽  
Safety Control ◽  
X Ray ◽  
Safety Procedures

In this report, we summarize over 30 years of analytical x-ray safety history at Lawrence Livermore National Laboratory (LLNL), and describe the safety procedures used in the operation of analytical x-ray equipment in the laboratories managed by the LLNL Chemistry and Materials Science Department (C&MSD). The present safety control system, which was developed by users of the equipment, has proven effective in keeping incidents at LLNL to a rate consistent with the national average.

scholarly journals Study of pure and mixed clustered noble gas puffs irradiated with a high intensity (7 × 1019 W/cm2) sub-ps laser beam and achievement of a strong X-ray flash in a laser-generated debris-free X-ray source

2019 ◽  
Vol 37 (03) ◽  
pp. 276-287
Author(s):  
K. A. Schultz ◽  
V. L. Kantsyrev ◽  
A. S. Safronova ◽  
V. V. Shlyaptseva ◽  
E. E. Petkov ◽  
...  
Keyword(s):  
Laser Beam ◽  
Noble Gas ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Experimental Parameter ◽  
Mixed Gas ◽  
Plasma Parameters ◽  
X Ray ◽  
Drastic Increase ◽  
Degree Of Anisotropy

AbstractWe present a broad study of linear, clustered, noble gas puffs irradiated with the frequency doubled (527 nm) Titan laser at Lawrence Livermore National Laboratory. Pure Ar, Kr, and Xe clustered gas puffs, as well as two mixed-gas puffs consisting of KrAr and XeKrAr gases, make up the targets. Characterization experiments to determine gas-puff density show that varying the experimental parameter gas-delay timing (the delay between gas puff initialization and laser-gas-puff interaction) provides a simple control over the gas-puff density. X-ray emission (>1.4 keV) is studied as a function of gas composition, density, and delay timing. Xe gas puffs produce the strongest peak radiation in the several keV spectral region. The emitted radiation was found to be anisotropic, with smaller X-ray flux observed in the direction perpendicular to both laser beam propagation and polarization directions. The degree of anisotropy is independent of gas target type but increases with photon energy. X-ray spectroscopic measurements estimate plasma parameters and highlight their difference with previous studies. Electron beams with energy in excess of 72 keV are present in the noble gas-puff plasmas and results indicate that Ar plays a key role in their production. A drastic increase in harder X-ray emissions (X-ray flash effect) and multi-MeV electron-beam generation from Xe gas-puff plasma occurred when the laser beam was focused on the front edge of the linear gas puff.

scholarly journals The adaptive x-ray optic project at the Lawrence Livermore National Laboratory

2014 ◽  
Vol 493 ◽  
pp. 012022
Author(s):  
T Pardini ◽  
L A Poyneer ◽  
T J McCarville ◽  
B Macintosh ◽  
B Bauman ◽  
...  
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
X Ray

Review of Ni-like ion X-ray laser research at Lawrence Livermore National Laboratory

2000 ◽  
Vol 1 (8) ◽  
pp. 1035-1044
Author(s):  
Joseph Nilsen ◽  
James Dunn ◽  
Yuelin Li ◽  
Albert L. Osterheld ◽  
Vyacheslav N. Shlyaptsev ◽  
...  
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
X Ray

scholarly journals The importance of EBIT data for Z-pinch plasma diagnostics

2008 ◽  
Vol 86 (1) ◽  
pp. 267-276 ◽  
Author(s):  
A S Safronova ◽  
V L Kantsyrev ◽  
P Neill ◽  
U I Safronova ◽  
D A Fedin ◽  
...  
Keyword(s):  
Electron Beam ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Theoretical Models ◽  
High Energy ◽  
High Energy Density ◽  
Strong Electron ◽  
Model Calculations ◽  
X Ray ◽  
Z Pinch

The results from the last six years of X-ray spectroscopy and spectropolarimetry of high-energy density Z-pinch plasmas complemented by experiments with the electron beam ion trap (EBIT) at the Lawrence Livermore National Laboratory (LLNL) are presented. The two topics discussed are the development of M-shell X-ray W spectroscopic diagnostics and K-shell Ti spectropolarimetry of Z-pinch plasmas. The main focus is on radiation from a specific load configuration called an “X-pinch”. In this work the study of X-pinches with tungsten wires combined with wires from other, lower Z materials is reported. Utilizing data produced with the LLNL EBIT at different energies of the electron beam the theoretical prediction of line positions and intensity of M-shell W spectra were tested and calibrated. Polarization-sensitive X-pinch experiments at the University of Nevada, Reno (UNR) provide experimental evidence for the existence of strong electron beams in Ti and Mo X-pinch plasmas and motivate the development of X-ray spectropolarimetry of Z-pinch plasmas. This diagnostic is based on the measurement of spectra recorded simultaneously by two spectrometers with different sensitivity to the linear polarization of the observed lines and compared with theoretical models of polarization-dependent spectra. Polarization-dependent K-shell spectra from Ti X-pinches are presented and compared with model calculations and with spectra generated by a quasi-Maxwellian electron beam at the LLNL EBIT-II electron beam ion trap.PACS Nos.: 32.30.Rj, 52.58.Lq, 52.70.La

scholarly journals Containing Explosions

2003 ◽  
Vol 125 (09) ◽  
pp. 62-64 ◽  
Author(s):  
Robert E. Nickell ◽  
Christopher Romero
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Test Results ◽  
Proton Radiography ◽  
Atomic Weapons ◽  
X Ray ◽  
Weapon Systems ◽  
The United Kingdom ◽  
Advanced Computing ◽  
Explosive Detonation

The design analysis techniques, used to determine vulnerability to attack or lethality of an explosive detonation, have been tested against a large database of experimental and test results. Building explosive testing chambers presents a whole new set of challenges, since the purpose of such tests is not the survival or destruction of the vessel, but gaining a better understanding of the explosion's dynamics. Los Alamos and Lawrence Livermore National Laboratory have chosen to combine aboveground testing using mock materials, advanced X-ray and proton radiography, and advanced computing capabilities for complex simulations. These vessel systems, when used with diagnostics such as flash or proton radiography, provide important data that help our weapon's designers validate design codes and support the certification of the weapon systems. The Atomic Weapons Establishment in the United Kingdom has similar activity under way. Testing has shown that within a millisecond, the stresses within the pressure vessel shift from a sharp, uniform impulse to a 1 kHz vibration. The amount of stress, or excitation, that the impulse places on the structure can be figured as the integral of the load over time of duration.

scholarly journals Lawrence Livermore National Laboratory's activities to achieve ignition by X-ray drive on the National Ignition Facility

1999 ◽  
Vol 17 (2) ◽  
pp. 159-171 ◽  
Author(s):  
J.D. KILKENNY ◽  
T.P. BERNAT ◽  
B.A. HAMMEL ◽  
R.L. KAUFFMAN ◽  
O.L. LANDEN ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Sandia National Laboratory ◽  
Department Of Energy ◽  
Naval Research ◽  
Inertial Confinement ◽  
National Ignition Facility ◽  
X Ray ◽  
Omega Laser

The National Ignition Facility (NIF) is a MJ-class glass laser-based facility funded by the Department of Energy which has achieved thermonuclear ignition and moderate gain as one of its main objectives. In the summer of 1998, the project was about 40% complete, and design and construction was on schedule and on cost. The NIF will start firing onto targets in 2001, and will achieve full energy in 2004. The Lawrence Livermore National Laboratory (LLNL) together with the Los Alamos National Laboratory (LANL) have the main responsibility for achieving X-ray driven ignition on the NIF. In the 1990s, a comprehensive series of experiments on Nova at LLNL, followed by recent experiments on the Omega laser at the University of Rochester, demonstrated confidence in understanding the physics of X-ray drive implosions. The same physics at equivalent scales is used in calculations to predict target performance on the NIF, giving credence to calculations of ignition on the NIF. An integrated program of work in preparing the NIF for X-ray driven ignition in about 2007, and the key issues being addressed on the current Inertial Confinement Fusion (ICF) facilities [(Nova, Omega, Z at Sandia National Laboratory (SNL) and NIKE at the Naval Research Laboratory (NRL)], are described.

A HIGH-DENSITY ELECTRON BEAM AND QUAD-SCAN MEASUREMENTS AT PLEIADES THOMSON X-RAY SOURCE

2007 ◽  
Vol 22 (23) ◽  
pp. 4317-4323
Author(s):  
J. K. LIM ◽  
J. B. ROSENZWEIG ◽  
S. G. ANDERSON ◽  
A. M. TREMAINE
Keyword(s):  
Electron Beam ◽  
Optical Transition ◽  
Beam Quality ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
High Density ◽  
Interaction Point ◽  
Beam Spot ◽  
X Ray ◽  
Parameter Values

A recent development of the photo-cathode injector technology has greatly enhanced the beam quality necessary for the creation of high density/high brightness electron beam sources. In the Thomson backscattering x-ray experiment, there is an immense need for under 20 micron electron beam spot at the interaction point with a high-intensity laser in order to produce a large x-ray flux. This has been demonstrated successfully at PLEIADES in Lawrence Livermore National Laboratory. For this Thomson backscattering experiment, we employed an asymmetric triplet, high remanence permanent-magnet quads to produce smaller electron beams. Utilizing highly efficient optical transition radiation (OTR) beam spot imaging technique and varying electron focal spot sizes enabled a quadrupole scan at the interaction zone. Comparisons between Twiss parameters obtained upstream to those parameter values deduced from PMQ scan will be presented in this report.

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