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Author : Stuart L. Jackson
Publisher :
ISBN 13 :
Total Pages : 266 pages
Book Rating : 4.:/5 (768 download)
Download or read book Density Characteristics of a Sheared-flow Z-pinch written by Stuart L. Jackson and published by . This book was released on 2006 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Elliot L. Claveau
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (124 download)
Download or read book Axial Evolution of a Sheared-flow-stabilized Z Pinch written by Elliot L. Claveau and published by . This book was released on 2020 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Fusion Z-pinch Experiment (FuZE) is a sheared-flow-stabilized Z pinch based on the ZaP and ZaP-HD experiments. The FuZE device generates neutron-producing, 50-cm-long Z pinches formed from plasma accelerated through coaxial electrodes. The Z pinches are sustained between a nose cone at the tip of the plasma gun and an end wall at the end of the assembly region flux conserver. The end wall geometry is modified from a central hole to a spoked design and it is found that plasma exhaust is limited, but can be increased by increasing the ratio of ram and thermal pressures to the magnetic field pressure. The limited plasma exhaust results in a stagnation wave in the assembly region, increasing the plasma axial current and changing the shear flow profiles from a hollow to a peaked velocity distribution. The instantaneous neutron scaling with pinch current is investigated and it is found that the scaling corresponds to an adiabatic pinch where linear density increases with axial current. Lastly, the termination of plasma acceleration is found to be triggered by a blow-by instability starting at the insulator located at the breech end of the coaxial accelerator.
Author : Sergey V. Lebedev
Publisher : Springer Science & Business Media
ISBN 13 : 1402060556
Total Pages : 321 pages
Book Rating : 4.4/5 (2 download)
Download or read book High Energy Density Laboratory Astrophysics written by Sergey V. Lebedev and published by Springer Science & Business Media. This book was released on 2007-05-27 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work will be of interest to a wide range of academics. It provides a comprehensive round-up of the proceedings and papers delivered at the 2006 Conference on High Energy Density Laboratory Astrophysics, held at Rice University in Houston, Texas, USA. The contributions come from scientists interested in this emerging field. They discuss the progress in topics covering everything from stellar evolution and envelopes, to opacities, radiation transport and x-ray photoionized plasmas.
Author : Bonghan Kim
Publisher :
ISBN 13 :
Total Pages : 55 pages
Book Rating : 4.:/5 (17 download)
Download or read book Multi-chord Heterodyne Quadrature Interferometry Measurement of the FuZE Sheared Flow Z - Pinch Plasma written by Bonghan Kim and published by . This book was released on 2018 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: The FuZE Z-pinch experiment is a plasma confinement experiment that uses radially sheared plasma flow to stabilize the otherwise unstable Z-pinch plasma. The experiment aims to test sheared flow stabilization in fusion-relevant plasma parameters to investigate sheared Z-pinch confinement's potential for nuclear fusion power generation.The FuZE Diagnostic suite includes He-Ne heterodyne quadrature multi-chord interferometry, which has been used to gain insight into the time evolving density characteristics of FuZE Z-pinch plasma. This thesis covers the experimental setup of the He-Ne interferometry, theoretical background behind heterodyne quadrature interferometry, signal analysis using analog circuitry and a Python routine, and the resulting density measurements.
Author : George A. Kyrala
Publisher : Springer Science & Business Media
ISBN 13 : 1402041624
Total Pages : 388 pages
Book Rating : 4.4/5 (2 download)
Download or read book High Energy Density Laboratory Astrophysics written by George A. Kyrala and published by Springer Science & Business Media. This book was released on 2005-12-14 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past several years, research teams around the world have developed astrophysics-relevant utilizing high energy-density facilities such as intense lasers and z-pinches. Research is underway in many areas, such as compressible hydrodynamic mixing, strong shock phenomena, radiation flow, radiative shocks and jets, complex opacities, equations of stat, and relativistic plasmas. Beyond this current research and the papers it is producing, plans are being made for the application, to astrophysics-relevant research, of the 2 MJ National Ignition Facility (NIF) laser at Lawrence Livermore National Laboratory; the 600 kj Ligne d'Intégration Laser (LIL) and the 2 MJ Laser Mégajoule (LMJ) in Bordeaux, France; petawatt-range lasers now under construction around the world; and current and future Z pinches. The goal of this conference and these proceedings is to continue focusing attention on this emerging research area. The conference brought together different scientists interested in this emerging new field, with topics covering: - Hydrodynamic instabilities in astrophysics, - Supernovae and supernova remnant evolution, - Astrophysical shocks, blast waves, and jets, - Stellar opacities, - Radiation and thermal transport, - Dense plasma atomic physics and EOS, - X-ray photoionized plasmas, - Ultrastrong magnetic field generation.
Author : Michael Patrick Ross
Publisher :
ISBN 13 :
Total Pages : 245 pages
Book Rating : 4.:/5 (981 download)
Download or read book Exploring Plasma Stability and Confinement with High Resolution Density Measurements on the ZaP-HD Flow Z-Pinch written by Michael Patrick Ross and published by . This book was released on 2016 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ZaP-HD Flow Z-Pinch project provides a platform to explore how shear flow stabilized Z-pinches could scale to high-energy-density plasma (plasma with pressures exceeding 1~Mbar) and fusion reactor conditions. The Z-pinch is a linear plasma confinement geometry in which the plasma carries axial electric current and is confined by its self-induced magnetic field. ZaP-HD generates shear stabilized, axisymmetric Z-pinches with stable lifetimes approaching 60ms. The goal of the project is to increase the plasma density and temperature compared to the previous ZaP project by compressing the plasma to smaller radii (~1mm). Radial and axial plasma electron density structure is measured using digital holographic interferometry (DHI), which provides the necessary fine spatial resolution. ZaP-HD's DHI system uses a 2ns Nd:YAG laser pulse with a second harmonic generator (lambda = 532nm) to produce holograms recorded by a Nikon D3200 digital camera. The holograms are numerically reconstructed with the Fresnel transform reconstruction method to obtain the phase shift caused by the interaction of the laser beam with the plasma. This provides a two-dimensional map of line-integrated electron density, which can be Abel inverted to determine the local number density. The DHI resolves line-integrated densities down to 3 X 1020m−2 with spatial resolution near 10 micro m. This dissertation presents the first application of Fresnel transform reconstruction as an analysis technique for a plasma diagnostic, and it analyzes the method's accuracy through study of synthetic data. It then presents an Abel inversion procedure that utilizes data on both sides of a Z-pinch local number density profile to maximize profile symmetry. Density measurements from DHI reveal the quality of ZaP-HD's confinement, specifically its scaling properties. DHI measurements also enable an evaluation of Z-pinch stability metrics.
Download or read book The ZaP Flow Z-Pinch Project written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results from the ZaP experiment are consistent with the theoretical predictions of sheared flow stabilization. Z pinches with a sheared flow are generated in the ZaP experiment using a coaxial accelerator coupled to an assembly region. The current sheet in the accelerator initially acts as a snowplow. As the Z pinch forms, plasma formation in the accelerator transits to a deflagration process. The plasma exits the accelerator and maintains the flow in the Z pinch. During the quiescent period in the magnetic mode activity at z=0 cm, a stable Z pinch is seen on the axis of the assembly region. The evolution of the axial velocity profile shows a large velocity shear is measured at the edge of the Z pinch during the quiescent period. The velocity shear is above the theoretical threshold. As the velocity shear decreases towards 0.1kV{sub A}, the predicted stability threshold, the quiescent period ends. The present understanding of the ZaP experiment shows that it may be possible for the Z pinch to operate in a steady state if the deflagration process can be maintained by constantly supplying neutral gas or plasma to the accelerator.
Author : Michael A. Liberman
Publisher : Springer Science & Business Media
ISBN 13 : 1461214246
Total Pages : 285 pages
Book Rating : 4.4/5 (612 download)
Download or read book Physics of High-Density Z-Pinch Plasmas written by Michael A. Liberman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: A "z pinch" is a deceptively simple plasma configuration in which a longitudinal current produces a magnetic field that confines the plasma. Z-pinch research is currently one of the fastest growing areas of plasma physics, with revived interest in z-pinch controlled fusion reactors along with investigations of new z-pinch applications, such as very high power x-ray sources, high-energy neutrons sources, and ultra-high magnetic fields generators. This book provides a comprehensive review of the physics of dense z pinches and includes many recent experimental results.
Author : A. H. Glasser
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (122 download)
Download or read book The Stability of the High-density Z-pinch written by A. H. Glasser and published by . This book was released on 1989 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 994 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph Haim Shiloh
Publisher :
ISBN 13 :
Total Pages : 420 pages
Book Rating : 4.:/5 (353 download)
Download or read book High Density Z-pinch written by Joseph Haim Shiloh and published by . This book was released on 1978 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.0/5 ( download)
Download or read book 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit 10-13 July 2005, Tucson, Arizona: 05-3850 - 05-3899 written by and published by . This book was released on 2005 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 670 pages
Book Rating : 4.3/5 (91 download)
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1014 pages
Book Rating : 4.:/5 (334 download)
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1966-11 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ohmically Heated High-density Z Pinch written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The gross properties of a high-density (n approximately equal to 10$sup 27$ m−3), small-radius, (r = 10−4 m) gas-imbedded Z pinch have been examined considering only classical processes. The rate equation using only ohmic heating along with bremsstrahlung and radial heat transport shows that ohmic heating will rapidly take the pinch to thermonuclear temperatures for currents, I, greater than 1 MA. The radial heat loss for the pinch is very small for I greater than 1.5 MA. This suggests that the pinch could tolerate being driven to a nearby wall by an m = 1 kink. The laser technology for initiation of the small-diameter filament and the high-voltage technology for giving a 30-ns rise to a MA or more are available now. Some reactor considerations have been included. (auth).
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 030908637X
Total Pages : 177 pages
Book Rating : 4.3/5 (9 download)
Download or read book Frontiers in High Energy Density Physics written by National Research Council and published by National Academies Press. This book was released on 2003-05-11 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent scientific and technical advances have made it possible to create matter in the laboratory under conditions relevant to astrophysical systems such as supernovae and black holes. These advances will also benefit inertial confinement fusion research and the nation's nuclear weapon's program. The report describes the major research facilities on which such high energy density conditions can be achieved and lists a number of key scientific questions about high energy density physics that can be addressed by this research. Several recommendations are presented that would facilitate the development of a comprehensive strategy for realizing these research opportunities.
Author : Jonathan Robert Weed
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (91 download)
Download or read book Investigating Plasma Viscosity with Fast Framing Photography in the ZaP-HD Flow Z-Pinch Experiment written by Jonathan Robert Weed and published by . This book was released on 2015 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ZaP-HD Flow Z-Pinch experiment investigates the stabilizing effect of sheared axial flows while scaling toward a high-energy-density laboratory plasma (HEDLP > 100 GPa). Stabilizing flows may persist until viscous forces dissipate a sheared flow profile. Plasma viscosity is investigated by measuring scale lengths in turbulence intentionally introduced in the plasma flow. A boron nitride turbulence-tripping probe excites small scale length turbulence in the plasma, and fast framing optical cameras are used to study time-evolved turbulent structures and viscous dissipation. A Hadland Imacon 790 fast framing camera is modified for digital image capture, but features insufficient resolution to study turbulent structures. A Shimadzu HPV-X camera captures the evolution of turbulent structures with great spatial and temporal resolution, but is unable to resolve the anticipated Kolmogorov scale in ZaP-HD as predicted by a simplified pinch model.
