scholarly journals Experimental testing of thin-shell stable acceleration for ICF schemes with direct and indirect drive

1993 ◽  
Vol 11 (1) ◽  
pp. 127-135 ◽  
Author(s):  
V. A. Bolotin ◽  
I. N. Burdonsky ◽  
A. L. Velikovich ◽  
V. V. Gavrilov ◽  
S. M. Golberg ◽  
...  
Keyword(s):  
Power Density ◽  
Experimental Testing ◽  
Laser System ◽  
Contrast Ratio ◽  
Target Surface ◽  
Output Energy ◽  
Main Beam ◽  
Experimental Investigations ◽  
X Ray ◽  
Beam Output

The present review is of the experimental investigations on laser-plasma interaction being carried out in past years at IAE. Experiments were conducted on the “Mishen” facility. The laser system of Mishen consists of two channels with output beam parameters as follows: the main beam—output energy 100–200 J (λ = 1.054 μm) in 3-ns pulse, divergence ∼2 × 10-4 rad, contrast ratio ∼106, power density at the target surface ∼1013–1014 W/cm2; the diagnostic beam–output energy 10–20 J (λ = 1.054 μm) and 5–10 J (λ = 0.53 μm) in 0.3-ns pulse, divergence ∼10-4 rad, power density 1013 - 1014 W/cm2. Our aim in this experiment is to study the different aspects of the ICF processes in flat geometry. The main issues of our studies are hydrodynamic aspects, including acceleration efficiency, high-velocity impact in cascade targets, hydrostability, and X-ray physicsconversion efficiency, heat transfer, and X-ray-driven targets.

scholarly journals Optimization of X-ray emission from a laser-produced plasma in a narrow wavelength band

1992 ◽  
Vol 10 (4) ◽  
pp. 759-765 ◽  
Author(s):  
G. E. Van Dorssen ◽  
E. Louis ◽  
F. Bijkerk
Keyword(s):  
Power Density ◽  
Laser Power ◽  
Multilayer Coating ◽  
Target Surface ◽  
Laser Power Density ◽  
Strong Increase ◽  
Wavelength Band ◽  
Line Radiation ◽  
X Ray ◽  
Photoconductive Detector

The X-ray emission from laser-produced plasmas at an X-ray wavelength of approximately 10.4 nm was measured for Al and Gd target materials. The laser power density on the target surface was varied between 1.5 × 1010 and 3 × 1012 W/cm2 to obtain different electron temperatures. The output from the plasma was measured using an X-ray reflecting Pd-C multilayer coating as a wavelength-selective element and a diamond photoconductive detector. The emission at 10.4 nm is strongest at the low end of the power density range investigated. A strong increase is found for Al targets due to a contribution of line radiation, which is not present in the Gd plasmas. The measured conversion efficiency for Al plasmas was (4.5 ± 1)% in a 3% bandwidth at an X-ray wavelength of 10.4 nm.

scholarly journals Advanced 20 TW Ti:S laser system for X-ray laser and coherent XUV generation irradiated by ultra-high intensities

2005 ◽  
Vol 23 (2) ◽  
pp. 183-186 ◽  
Author(s):  
HIROTO KURODA ◽  
MASAYUKI SUZUKI ◽  
RASHID GANEEV ◽  
JUN ZHANG ◽  
MOTOYOSHI BABA ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Laser Energy ◽  
Laser System ◽  
Contrast Ratio ◽  
High Repetition Rate ◽  
Collisional Excitation ◽  
Center Wavelength ◽  
X Ray ◽  
High Repetition ◽  
Nd:Glass Laser

In order to develop a high repetition rate X-ray lasers, the longitudinal-pumped transient collisional excitation (TCE) X-ray laser is one of the most effective pumping schemes. The high directive Ni-like Mo 18.9 nm soft X-ray laser pumped by modest laser energy has already been demonstrated by using the tabletop size Ti:sapphire/Nd:glass laser system that delivering energy of 150 mJ in 475 fs at the center wavelength of 1054 nm. The total energy in the pre-pulse and the main pulse was 150 mJ, which will make possible multi-hertz operation. To pursue the high repetition rate of the laser-driven TCE X-ray laser, we have designed a new 20 TW Ti:Sapphire laser system (600 mJ, 30 fs, 10 Hz). Special attention was paid to improve the contrast ratio, control of pulse shape as well as phase by an acoustic optic programmable dispersive filter (AOPDF) and 1 kHz preamplifier. Preliminary data have shown good laser characteristics. As the preliminary experiments, we have investigated high order harmonics generation from low-density laser plasma by using the solid target irradiated by a femtosecond laser pulse. The highest order was the 51st. harmonic at wavelength of 15.61 nm.

scholarly journals New high-power laser facility PALS—prospects for laser–plasma research

1999 ◽  
Vol 17 (2) ◽  
pp. 179-194 ◽  
Author(s):  
B. RUS ◽  
K. ROHLENA ◽  
J. SKÁLA ◽  
B. KRÁLIKOVÁ ◽  
K. JUNGWIRTH ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Radiation Transport ◽  
Laser System ◽  
Main Beam ◽  
Inertial Confinement ◽  
X Ray ◽  
Multiple Pulse ◽  
Laser Facility ◽  
Under Construction

In this paper, we report on a new laser facility called PALS (Prague Asterix Laser System), which is currently under construction, and which will house the high-power iodine laser Asterix IV. Upon its completion in late 1999, the PALS facility will be capable of providing single- or multiple-pulse irradiation with a variable pulse duration ranging from 100 to 500 ps. Wavelengths available will be 1.315 μm, 658 nm, and 438 nm. The system will provide one main beam with energy up to 1200 J and two smaller auxiliary beams with a combined energy of up to 100 J. A wide variety of geometries and variable pulse timings is available. We assess PALS' potential for investigating the physics of laser plasmas in inertial confinement fusion, the development and applications of X-ray lasers, X-ray spectroscopy, and radiation transport, using multiple-pulse and extended beam capability.

scholarly journals Investigations of plasma jet interaction with ambient gases by multi-frame interferometric and X-ray pinhole camera systems

2009 ◽  
Vol 27 (1) ◽  
pp. 115-122 ◽  
Author(s):  
A. Kasperczuk ◽  
T. Pisarczyk ◽  
Ph. Nicolai ◽  
Ch. Stenz ◽  
V. Tikhonchuk ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Speed ◽  
Laser System ◽  
Target Surface ◽  
Pinhole Camera ◽  
Plasma Jets ◽  
Incidence Geometry ◽  
X Ray ◽  
Ambient Gases ◽  
Ar Gas

AbstractInteractions of laser driven plasma jets with He and Ar gas puffs was investigated experimentally by means of three-frame interferometric/shadowgraphic system and three-frame X-ray pinhole camera. A defocused iodine laser beam using the Prague Asterix Laser System (PALS) interacting with massive planar Cu targets generated high-speed well-collimated plasma jets. The PALS third harmonic (0.438 µm), with pulse duration of 250 ps (full width at half maximum), and energy of 100 J was employed in two irradiation geometries: with an incidence normal to the target surface and with an oblique one (30° with respect to the target normal), in order to minimize the heating of the ambient gas by the laser beam. The results of these interaction experiments, in particular, those obtained in case of the oblique incidence geometry, are presented and discussed. They show the effect of the double shock formation in ambient gases: starting by the ablative plasma action, followed by that of the jet.

Debris from High-Aspect-Ratio Rectangular Focused Laser Irradiation on a Tape Target Surface in an X-Ray Laser System

1998 ◽  
Vol 37 (Part 1, No. 9A) ◽  
pp. 5071-5075 ◽  
Author(s):  
Yoshiyuki Hisada ◽  
Petros Abraha ◽  
Kiichi Takamoto ◽  
Naohiro Yamaguchi ◽  
Tamio Hara
Keyword(s):  
Aspect Ratio ◽  
Laser Irradiation ◽  
High Aspect Ratio ◽  
Laser System ◽  
Target Surface ◽  
X Ray

scholarly journals K α x-ray emission characterization of 100 Hz, 15 mJ femtosecond laser system with high contrast ratio

2008 ◽  
Vol 94 (4) ◽  
pp. 569-575 ◽  
Author(s):  
S. Fourmaux ◽  
C. Serbanescu ◽  
R. E. Kincaid ◽  
A. Krol ◽  
J. C. Kieffer
Keyword(s):  
Femtosecond Laser ◽  
Laser System ◽  
Contrast Ratio ◽  
High Contrast ◽  
X Ray

X-ray micro tomography in the scanning electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 106-107 ◽  
Author(s):  
W. Brünger
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Target Surface ◽  
The Body ◽  
X Rays ◽  
Cross Sectional ◽  
X Ray ◽  
Micro Tomography ◽  
Scanning Electron

Reconstructive tomography is a new technique in diagnostic radiology for imaging cross-sectional planes of the human body /1/. A collimated beam of X-rays is scanned through a thin slice of the body and the transmitted intensity is recorded by a detector giving a linear shadow graph or projection (see fig. 1). Many of these projections at different angles are used to reconstruct the body-layer, usually with the aid of a computer. The picture element size of present tomographic scanners is approximately 1.1 mm2.Micro tomography can be realized using the very fine X-ray source generated by the focused electron beam of a scanning electron microscope (see fig. 2). The translation of the X-ray source is done by a line scan of the electron beam on a polished target surface /2/. Projections at different angles are produced by rotating the object.During the registration of a single scan the electron beam is deflected in one direction only, while both deflections are operating in the display tube.

scholarly journals Phase Relations in the ZrO2-MgO-FeOx System: Experimental Data and Assessment of Thermodynamic Parameters

2021 ◽  
Author(s):  
Ivan Saenko ◽  
O. Fabrichnaya
Keyword(s):  
Electron Microscopy ◽  
Experimental Data ◽  
Solid Solution ◽  
Thermodynamic Parameters ◽  
Spinel Phase ◽  
Experimental Investigations ◽  
X Ray ◽  
Heat Treated ◽  
Preliminary Phase ◽  
Scanning Electron

AbstractThermodynamic parameters were assessed for the MgO–FeOx system and combined with already available descriptions of ZrO2-FeOx and ZrO2-MgO systems to calculate preliminary phase diagrams for planning experimental investigations. Samples of selected compositions were heat treated at 1523, 1673 and 1873 K and characterized using x-ray and scanning electron microscopy combined with energy dispersive x-ray spectroscopy (SEM/EDX). Experiments indicated extension of cubic ZrO2 solid solution into the ternary system at 1873 K (75 mol.% ZrO2, 10 mol.% FeOx and 15 mol.% MgO) and limited solubility of 4 mol.% ZrO2 in spinel phase. Based on the obtained results thermodynamic parameters of C-ZrO2 and spinel phase were optimized.

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