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Investigation Of The Compression Of Magnetized Plasma And Magnetic Flux
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Book Synopsis Investigation of the Compression of Magnetized Plasma and Magnetic Flux by : Dimitry Mikitchuk
Download or read book Investigation of the Compression of Magnetized Plasma and Magnetic Flux written by Dimitry Mikitchuk and published by Springer. This book was released on 2019-06-28 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research studies the fundamental physics occurring during the magnetic flux and magnetized plasma compression by plasma implosion. This subject is relevant to numerous studies in laboratory and space plasmas. Recently, it has attracted particular interest due to the advances in producing high-energy-density plasmas in fusion-oriented experiments, based on the approach of magnetized plasma compression. The studied configuration consists of a cylindrical gas-puff shell with pre-embedded axial magnetic field that pre-fills the anode-cathode gap. Subsequently, axial pulsed current is driven through the plasma generating an azimuthal magnetic field that compresses the plasma and the axial magnetic field embedded in it. A key parameter for the understanding of the physics occurring during the magnetized plasma compression is the evolution and distribution of the axial and azimuthal magnetic fields. Here, for the first time ever, both fields are measured simultaneously employing non-invasive spectroscopic methods that are based on the polarization properties of the Zeeman effect. These measurements reveal unexpected results of the current distribution and the nature of the equilibrium between the axial and azimuthal fields. These observations show that a large part of the current does not flow in the imploding plasma, rather it flows through a low-density plasma residing at large radii. The development of a force-free current configuration is suggested to explain this phenomenon. Previously unpredicted observations in higher-power imploding-magnetized-plasma experiments, including recent unexplained structures observed in the Magnetized Liner Inertial Fusion experiment, may be connected to the present discovery.
Book Synopsis Computational Magnetohydrodynamic Investigation of Flux Compression and Implosion Dynamics in a Z-pinch Plasma with an Azimuthally Opposed Magnetic Field Configuration by :
Download or read book Computational Magnetohydrodynamic Investigation of Flux Compression and Implosion Dynamics in a Z-pinch Plasma with an Azimuthally Opposed Magnetic Field Configuration written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic flux compression is a well established technique for the generation of ultrahigh magnetic fields, large currents, and large energy densities. It has been suggested as a means for power density amplification on Z-pinch generators such as Decade Quad, at Arnold Engineering Development Center, and it may be especially suitable as a means for producing higher powers of K-shell radiation from high atomic number loads such as titanium. Although many one-dimensional models of flux compression on Z-pinch generators exist, an improvement in understanding is needed about the physics and implosion dynamics on a two-dimensional level. To this end, a two-dimensional resistive magnetohydrodynamic code was used to study a particular flux compression concept for use on Decade Quad. In the concept under study, compression occurs for self generated opposing azimuthal magnetic fields. In order to provide appropriate boundary conditions for the simulations, a non-linear circuit model was developed to enable calculation of the dynamically changing inductive and resistive impedances of the two coupled current paths such that they are consistent with the developing plasma. Good flux compression is observed despite magnetic flux losses. Two dimensional calculations are shown to match reasonably well with one-dimensional results. However, results also indicate Rayleigh-Taylor instabilities significantly affect implosion dynamics through the creation of isolated magnetic flux pockets, formation of circular currents, and the redistribution of current flow. It is also found that the Aluminum plasma armature shorts out on the stator, and thereby causes a nonideal current distribution in the titanium plasma. Consequently, the titanium plasma does not receive sufficient energy transfer for efficient K-shell radiative emission.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720618492 Total Pages :38 pages Book Rating :4.6/5 (184 download)
Book Synopsis Magnetic Flux Compression Experiments Using Plasma Armatures by : National Aeronautics and Space Administration (NASA)
Download or read book Magnetic Flux Compression Experiments Using Plasma Armatures written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic flux compression reaction chambers offer considerable promise for controlling the plasma flow associated with various micronuclear/chemical pulse propulsion and power schemes, primarily because they avoid thermalization with wall structures and permit multicycle operation modes. The major physical effects of concern are the diffusion of magnetic flux into the rapidly expanding plasma cloud and the development of Rayleigh-Taylor instabilities at the plasma surface, both of which can severely degrade reactor efficiency and lead to plasma-wall impact. A physical parameter of critical importance to these underlying magnetohydrodynamic (MHD) processes is the magnetic Reynolds number (R(sub m), the value of which depends upon the product of plasma electrical conductivity and velocity. Efficient flux compression requires R(sub m) less than 1, and a thorough understanding of MHD phenomena at high magnetic Reynolds numbers is essential to the reliable design and operation of practical reactors. As a means of improving this understanding, a simplified laboratory experiment has been constructed in which the plasma jet ejected from an ablative pulse plasma gun is used to investigate plasma armature interaction with magnetic fields. As a prelude to intensive study, exploratory experiments were carried out to quantify the magnetic Reynolds number characteristics of the plasma jet source. Jet velocity was deduced from time-of-flight measurements using optical probes, and electrical conductivity was measured using an inductive probing technique. Using air at 27-inHg vacuum, measured velocities approached 4.5 km/s and measured conductivities were in the range of 30 to 40 kS/m.Turner, M. W. and Hawk, C. W. and Litchford, R. J.Marshall Space Flight CenterELECTRICAL RESISTIVITY; PLASMA COMPRESSION; MAGNETIC FLUX; REYNOLDS NUMBER; PLASMA JETS; PLASMA DYNAMICS; STABILITY; CHEMICAL PROPULSION; SPACECRAFT PROPULSION; ARMATURES; TEST FACILITIES; PLASMA GUNS
Book Synopsis Magnetic Flux Compression Experiments Using Plasma Armatures by : M. W. Turner
Download or read book Magnetic Flux Compression Experiments Using Plasma Armatures written by M. W. Turner and published by . This book was released on 2003 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetic Flux Compression Experiments Using Plasma Armatures by : Matthew W. Turner
Download or read book Magnetic Flux Compression Experiments Using Plasma Armatures written by Matthew W. Turner and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetic Flux Compression Experiments Using Plasma Armatures by : M. W. Turner
Download or read book Magnetic Flux Compression Experiments Using Plasma Armatures written by M. W. Turner and published by . This book was released on 2003 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic flux compression reaction chambers offer considerable promise for controlling the plasma flow associated with various micronuclear/chemical pulse propulsion and power schemes, primarily because they avoid thermalization with wall structures and permit multicycle operation modes. The major physical effects of concern are the diffusion of magnetic flux into the rapidly expanding plasma cloud and the development of Rayleigh-Taylor instabilities at the plasma surface, both of which can severely degrade reactor efficiency and lead to plasma-wall impact. A physical parameter of critical importance to these underlying magnetohydrodynamic (MHD) processes is the magnetic Reynolds number (Rm), the value of which depends upon the product of plasma electrical conductivity and velocity. Efficient flux compression requires Rm”1, and a thorough understanding of MHD phenomena at high magnetic Reynolds numbers is essential to the reliable design and operation of practical reactors. As a means of improving this understanding, a simplified laboratory experiment has been constructed in which the plasma jet ejected from an ablative pulse plasma gun is used to investigate plasma armature interaction with magnetic fields. As a prelude to intensive study, exploratory experiments were carried out to quantify the magnetic Reynolds number characteristics of the plasma jet source. Jet velocity was deduced from time-of-flight measurements using optical probes, and electrical conductivity was measured using an inductive probing technique. Using air at 27-inHg vacuum, measured velocities approached 4.5 km/s and measured conductivities were in the range of 30 to 40 kS/m.
Book Synopsis Magnetic Flux Compression by Expanding Plasma Armatures. [PULSAR]. by :
Download or read book Magnetic Flux Compression by Expanding Plasma Armatures. [PULSAR]. written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A one-dimensional magnetohydrodynamic computer code has been developed to study magnetic flux compression using explosively driven plasma armatures in cylindrically symmetric systems. This work supports a program to develop a compact, non-destructive, repetitive pulse power generator capable of multimegajoule outputs with pulse widths of about 10−5 sec. Details of the code construction and results of some calculations including the cynamics of the explosive detonation are presented.
Book Synopsis Time-dependent Structure of One-dimensional Magnetic Compression Waves in Collisionless Plasmas by : Vernon J. Rossow
Download or read book Time-dependent Structure of One-dimensional Magnetic Compression Waves in Collisionless Plasmas written by Vernon J. Rossow and published by . This book was released on 1967 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Magnetic Compression Experiment for the Study of Shock Wave Structures by : G. Goldenbaum
Download or read book A Magnetic Compression Experiment for the Study of Shock Wave Structures written by G. Goldenbaum and published by . This book was released on 1963 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The construction of the experimental apparatus for the investigation of the structure of hydromagnetic shock waves has been completed. By means of a technique developed in connection with so-called theta-pinch experiments a cylindrical plasma is produced with an internal magnetic field of variable magnitude. A fast rising external magnetic field is applied, which drives the plasma towards the axis thereby generating cylindrical shock waves. The density and the composition of the initial plasma, the magnitude of the internal magnetic field, the rise time and the maximum amplitude of the compressing field can be varied over a wide range. In particular it is possible to choose the parameters so that the ion mean free path in the shocked plasma is large compared to the ion cyclotron radius. (Author).
Book Synopsis Investigation of Plasma in Magnetic Field by : Samuel Goldsmith
Download or read book Investigation of Plasma in Magnetic Field written by Samuel Goldsmith and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-04 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liner Compression of a MAGO written by and published by . This book was released on 2005 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the ''metal liner'' approach to Magnetized Target Fusion (MTF), a preheated magnetized plasma target is compressed to thermonuclear temperature and high density by externally driving the implosion of a flux conserving metal enclosure, or liner, which contains the plasma target. As in inertial confinement fusion, the principle fusion fuel heating mechanism is pdV work by the imploding enclosure, called a pusher in ICF. One possible MTF target, the hard-core diffuse z pinch, has been studied in MAGO experiments at VNIIEF, and is one possible target being considered for experiments on the Atlas pulsed power facility. Numerical MHD simulations show two intriguing and helpful features of the diffuse z pinch with respect to compressional heating. First, in two-dimensional simulations the m=0 interchange modes, arising from an unstable pressure profile, result in turbulent motions and self-organization into a stable pressure profile. The turbulence also gives rise to convective thermal transport, but the level of turbulence saturates at a finite level, and simulations show substantial heating during liner compression despite the turbulence. The second helpful feature is that pressure profile evolution during compression tends towards improved stability rather than instability when analyzed according to the Kadomtsev criteria. A liner experiment is planned for Atlas to study compression of magnetic flux without plasma as a first step. The Atlas geometry is compatible with a diffuse z pinch, and simulations of possible future experiments show that keV temperatures and useful neutron production for diagnostic purposes should be possible if a suitable plasma injector is added to the Atlas facility.
Book Synopsis Computational and Experimental Investigation of Magnetized Target Fusion by :
Download or read book Computational and Experimental Investigation of Magnetized Target Fusion written by and published by . This book was released on 1996 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Magnetized Target Fusion (MTF), a preheated and magnetized target plasma is hydrodynamically compressed to fusion conditions. Because the magnetic field suppresses losses by electron thermal conduction in the fuel during the target implosion heating process, the compression may be over a much longer time scale than in traditional inertial confinement fusion (ICF). Bigger targets and much lower initial target densities than in ICF can be used, reducing radiative energy losses. Therefore, ''liner-on-plasma'' compressions, driven by relatively inexpensive electrical pulsed power, may be practical. Potential MTF target plasmas must meet minimum temperature, density, and magnetic field starting conditions, and must remain relatively free of high-Z radiation-cooling-enhancing contaminants. At Los Alamos National Laboratory, computational and experimental research is being pursued into MTF target plasmas, such as deuterium-fiber-initiated Z-pinches, and the Russian-originated MAGO plasma. In addition, liner-on-plasma compressions of such target plasmas to fusion conditions are being computationally modeled, and experimental investigation of such heavy liner implosions has begun. The status of the research will be presented.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1991-10 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Controlled Fusion and Plasma Research by :
Download or read book Controlled Fusion and Plasma Research written by and published by . This book was released on 1965 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1978 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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