The report describes a method used for propelling a thin disk (flyer plate) against a target to produce pulse-form shocks. A projectile is accelerated in a rupturing-diaphragm type gas gun, strikes a fixed metal plate, and is stopped. The impact-generated...
National Technical Information Service (NTIS)
Exploratory research has been performed in the use of a two-stage light gas gun facility to investigate the soft acceleration and breakup physics of rapidly launched thin plates. A flash radiograph system was joined with the gun facility to provide the principal diagnostic. In the study, radiographs of thin-plate ...
Energy Citations Database
... Title : ACCELERATION OF THIN PLATES BY EXPLODING FOIL TECHNIQUES. ... of thin plate to high velocities by exploding foils was dev loped. ...
DTIC Science & Technology
... Title : THE CONSTANT ACCELERATION GAS GUN PROBLEM,. ... The whole flow then is in a state of constant acceleration. ...
A novel approach for generating and accelerating positron bunches in a plasma wake is proposed and modeled. The system consists of a plasma with an embedded thin foil into which two electron beams are shot. The first beam creates a region for accelerating and focusing positrons and the second beam provides positrons to be ...
PubMed
Tests of thin composition vacuum windows of the type used for the Tagger in Hall B at the Thomas Jefferson National Accelerator Facility are described. Three different tests have been performed. These include: (1) measurement of the deformation and durability of a window under long term (>8 years) almost continuous vacuum load, (2) measurement of the ...
NASA Astrophysics Data System (ADS)
A varicose-profile, thin layer of heavy gas (SF6) in lighter gas (air) is impulsively accelerated by a planar, Mach 1.2 shock, producing Richtmyer-Meshkov instability. We present the first measurements of the circulation in the curtain during the vortex-dominated, nonlinear stage of the instability evolution. These ...
A two chamber electrically pumped electron beam stabilized gas discharge laser is enabled to operate at lower electron accelerating voltages for given power applications through provision of very thin separating diaphragms. The apparatus is controlled throughout initial pump down, laser gas filling, laser operation ...
We present a scheme for proton acceleration from a moving double layer formed by an ultraintense circularly polarized laser pulse with intensity 1021-1023 W cm-2 irradiated on a combination target. The target is composed of a thin overdense proton-rich foil located at the front followed by an underdense gas region behind with an ...
Deuterium absorption by aluminum cathodes during electric discharge in a strong magnetic field was investigated for discharge voltages up to 5000 v. It is shown that considerable concentrations of deuterium can thereby be established in the thin surface layer of the metal. Absorption begins only after breakdown of the thin passive oxide film. ...
We consider high-order harmonic generation from a single atom or molecule and show that the generated harmonic field is proportional to the dipole velocity. We derive this result by solving Maxwell's wave equation for an infinitely thin gas. Hence, the dipole velocity form is the one that relates directly to the harmonic field, and it should be used as a ...
Planar laser-induced fluorescence imaging is utilized in shock-tube experiments to visualize the development of a shock-accelerated thin gas layer. The Richtmyer-Meshkov instability of both sides of the heavy gas layer causes perturbations initially imposed on the two interfaces to develop into one of three ...
A varicose-profile, thin layer of heavy gas ( SF6) in lighter gas (air) is impulsively accelerated by a planar, Mach 1.2 shock, producing the Richtmyer-Meshkov instability. We present the first measurements of the circulation in the curtain during the vortex-dominated, nonlinear stage of the instability evolution. ...
In order to conduct Richtmyer-Meshkov instability experiments in shock accelerated thin liquid sheets, a light gas gun was designed and constructed at Marquette University. This paper contains the basic predictions and construction techniques utilized in the design and operation of a double diaphragm light gas gun. ...
... EFFECT OF GAS TEMPERATURE DURING THE ACCELERATION OF GAS TURBINE ENGINES ON THE THERMAL STATE OF TURBINE BLADES ...
A thin air-SF6-air gas curtain is impulsively accelerated by planar shock waves of varying strength (Mach 1.2-1.5) and investigated experimentally using simultaneous concentration field visualization and particle image velocimetry measurements. A novel nozzle design is used to create highly repeatable and flexible initial conditions ...
... OF CONTACT LIFETIME ON TEMPERATURE FOR THIN FILM W CONTACTS SPUTTER DEPOSITED ONTO SI-CE THERMOPILES WITH A ...
... boundaries are tracked and the spatial mesh is refined locally, was used to compute the flow, comparison with the for within the accelerating plate ...
Comparing gas saturation distribution over time (gas saturation history) with the distribution of shales in a heavy oil steamflood project in Kern River field, California, illustrates the influence of shales on steamflood response. This comparison shows that although shales as thin as 1 ft can contribute to local vertical confinement ...
An ionization beam profile monitor relying on a supersonic gas-jet shaped into an extended, thin curtain is proposed for operation in an ultra high vacuum environment for very low perturbation on the accelerated beam, as requested for the in-ring profile monitoring at the Ultra low energy Storage Ring (USR) at the Facility for ...
The Lanford and Rand FT-IR correlation for PECVD silicon nitride thin films was investigated for it validity for use with pulsed PECVD silicon nitride thin films. Several films with different deposition parameters and showerhead configurations were compared to the Lanford and Rand correlation by RBS and ERD using a 1.7 MeV Tandatron ...
... Accession Number : ADD019557. Title : Accelerated Gas Removal from Divers' Tissues Utilizing Gas Metabolizing Bacteria. ...
Sep 1, 2011... the Young Stand Thinning and Diversity Study was designed to test the effectiveness of modified thinning in acceleration of late-successional ...
Treesearch
In many accelerators running positively charged beams, ionization of residual gas and secondary electron emission in the beam pipe will give rise to an electron cloud which can cause beam blow-up or the loss of the circulating beam. One solution to avoid the electron cloud is to ensure that the vacuum wall has low secondary emission yield (SEY). The SEY of ...
Multiple supernovae and stellar winds from OB associations carve large holes filled with hot gas in the galactic disk. These superbubbles sweep up H I into cold, thin, dense shells and eventually grow large enough to blow completely out of the galactic H I disk. When superbubbles blow out of the disk, they vent hot gas and supernova ...
The fluid instability resulting from the impulsive acceleration a thin, heavy gas layer embedded in a lighter gas is characterized through high-speed flow visualization. The shock-accelerated event occurs over the course of 1 ms. A laser sheet illuminates a plane of the gas ...
DOE Information Bridge
Richtmyer-Meshkov instability of a thin curtain of heavy gas (SF6) embedded in air and accelerated by a planar shock wave (Mach 1.2) leads to the growth of interfacial perturbations in the curtain and to mixing. Our experiments produce a phenomenological description of the mixing transition and incipient turbulence during the first ...
An accelerated method of measuring moisture content in lubricants and additives is described, in which the moisture in a thin film of lubricant or additive is completely removed by heating in a stream of dry air, whose humidity is then measured by a coulometric gas hygrometer. Time for one analysis is 4-7 minutes, and the method is ...
Observations of the line emission from the Crab Nebula indicate a structure consisting of dense filaments from which thin clumpy sheets of gas fan out radially. The jet feature noted by van den Bergh is one of these sheets. The sheets may have been created by the differential acceleration of filaments, or they may be the ...
A device for accelerating a projectile to extremely high velocities, composed of a light gas accelerator to impart an initial high velocity to the projectile and a plasma accelerator and compressor receiving the moving projectile and accelerating it to hi...
The Holifield Heavy Ion Research Facility (HHIRF) typifies a new generation of heavy ion accelerators capable of producing high resolution beams with sufficient energy to study nuclear reactions across the periodic table. Exploiting the capabilities of the machine depends on the availability of thin foils at each stage of the experimental process. Rugged ...
... Title : THE EFFECTS OF GAS OCCLUSIONS AND STRAINS ON THE MAGNETIC PROPERTIES OF THIN PERMALLOY FILMS. ...
