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Magnetic field quality analysis using ANSYS

Description: The design of superconducting magnets for particles accelerators requires a high quality of the magnetic field. This paper presents an ANSYS 4.4A Post 1 macro that computes the field quality performing a Fourier analysis of the magnetic field. The results show that the ANSYS solution converges toward the analytical solution and that the error on the multipole coefficients depends linearly on the square of the mesh size. This shows the good accuracy of ANSYS in computing the multipole coefficien… more
Date: March 1, 1991
Creator: Dell'Orco, D. & Chen, Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnet power control system for the Tandem Mirror Experiment-Upgrade

Description: This paper describes the desktop computer/CAMAC-based system that controls the power source for the Tandem Mirror Experiment-Upgrade (TMX-U) magnet power system. Presently it contains 42 dc rectifier power supplies connected to 24 magnet coils arranged in 17 circuits. During each shot, the system delivers 22.6 MW dc to the magnets for about 3 s. The system is presently being changed to add six power supplies, two solenoidal throttle coils, and two reverse C-coils. When complete, the delivered p… more
Date: November 4, 1983
Creator: Bell, H.H. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Los Alamos Proton Storage Ring (PSR) injection deflector system

Description: We describe a pulsed magnetic deflector system planned for the injection system of the PSR. Two sets of magnets, appropriately placed in the optical systems of both the ring and the injection transport line, provide control of the rate at which particles are injected into a given portion of transverse phase space and limit the interaction of stored beam with the injection stripping foil. High-current modulators that produce relatively complex waveforms are required for this purpose. Solid-state… more
Date: January 1, 1983
Creator: Jason, A. J.; Higgins, E. F. & Koelle, A. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of superconducting toroidal magnet coils and testing facility in the USA

Description: In the U.S. Large Coil Program, three industrial teams are presently designing test coils to general specifications prepared by the Oak Ridge National Laboratory with guidance from USERDA. Each test coil is approximately half the bore size of reactor coils, being oval or D-shaped, with a bore of 2.5 x 3.5 m. The dimensions and operating requirements of the coils are identical for all test coils. The coils are designed to produce a peak field of at least 8 tesla at the winding of a selected coil… more
Date: January 1, 1977
Creator: Luton, J. N.; Haubenreich, P. N. & Thompson, P. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Numerical simulation of plasma opening switches

Description: Plasma Opening Switches have been examined numerically with the aid of the ANTHEM plasma simulation model. A generic bi-cylindrical switch is studied. The switching of generator pulses ranging from 50 ns to 1 ..mu..sec is reviewed, for a variety of plasma fill lengths and densities, and for a range of resistive loads. 7 refs., 9 figs.
Date: January 1, 1989
Creator: Mason, Rodney J.; Jones, Michael E. & Bergman, Christy D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nucleation and growth of /sup 3/He-B in /sup 3/He-A

Description: The /sup 3/He A ..-->.. B transition is remarkable for a number of reasons. Because of the small bulk free energy difference between the two phases, the probability of homogeneous thermal nucleation of the B phase is vanishingly small. Thus the experimental fact that the B phase nucleates readily from the A phase is not understood. The A ..-->.. B transition is also remarkable in that when it occurs after cooling from above the critical temperature, it occurs in an extreme state of supercooling… more
Date: January 1, 1987
Creator: Swift, G. W. & Buchanan, D. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Paris Aviation Salon, 1934

Description: This document reviews the Air show held in Paris in 1934. It includes charts and pictures of the aircraft which were from all parts of Europe.
Date: November 29, 1934
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preparation of oxide superconductors

Description: Preparation of bulk superconductors by cold pressing and sintering of metal oxides has been optimized in this study. A knowledge of phase behavior was used in developing a flux method for growing superconducting single crystals of yttrium and gadolinium based superconductors. Means of achieving single-phase, high-density samples of (Rare Earth)-Ba/sub 2/Cu/sub 3/O/sub 7/ with optimal electronic properties are reviewed. 2 refs., 2 figs.
Date: January 1, 1988
Creator: Peterson, D.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Short Survey of Document Structure Similarity Algorithms

Description: This paper provides a brief survey of document structural similarity algorithms, including the optimal Tree Edit Distance algorithm and various approximation algorithms. The approximation algorithms include the simple weighted tag similarity algorithm, Fourier transforms of the structure, and a new application of the shingle technique to structural similarity. We show three surprising results. First, the Fourier transform technique proves to be the least accurate of any of approximation algorit… more
Date: February 27, 2004
Creator: Buttler, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam deflection into a quadrant by a positionally stationary magnetic bending system

Description: A system of postionally stationary magnets is analyzed for the continuously variable deflection of a 50 MeV electron beam. The system is composed of a collection of horizontal and vertical bending magnets, quadrupoles, and a final deflection magnet that is conical in shape and capable of deflections of plus or minus 50 degrees simultaneously in both horizonal and vertical planes. Throughout the system the beam is assumed to be focused by its own magnetic self-field, the electric self-field bein… more
Date: June 20, 1980
Creator: Paul, A.C. & Neil, V.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design and operating experience of an ac-dc power converter for a superconducting magnetic energy storage unit

Description: The design philosophy and the operating behavior of a 5.5 kA, +-2.5 kV converter, being the electrical interface between a high voltage transmission system and a 30 MJ superconducting coil, are documented in this paper. Converter short circuit tests, load tests under various control conditions, dc breaker tests for magnet current interruption, and converter failure modes are described.
Date: January 1, 1984
Creator: Boenig, H. J.; Nielsen, R. G. & Sueker, K. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Harmonic strengths of PEP dipoles and some related effects and lessons

Description: The harmonic content of magnets such as the standard PEP bend is (among other things) a function of excitation current, the way the current is set and even the magnetization history. For instance, harmonic strengths generally vary not only with the magnitude of the current but the direction and rate at which the current is approached and set. The field distribution resulting from different procedures can vary markedly depending on both the mechanical and magnetic design and the degree to which … more
Date: September 1, 1981
Creator: Spencer, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Assembling semiconductor nanocomposites using DNA replication technologies.

Description: Deoxyribonucleic acid (DNA) molecules represent Nature's genetic database, encoding the information necessary for all cellular processes. From a materials engineering perspective, DNA represents a nanoscale scaffold with highly refined structure, stability across a wide range of environmental conditions, and the ability to interact with a range of biomolecules. The ability to mass-manufacture functionalized DNA strands with Angstrom-level resolution through DNA replication technology, however, … more
Date: November 1, 2005
Creator: Heimer, Brandon W.; Crown, Kevin K. & Bachand, George David
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lawrence Radiation Laboratory Physics Division Quarterly Report: November 1953 - January 1954

Description: The following report is a quarterly report done by the Physics Division of the University of California's Radiation Laboratory, covering the period of November and December of 1953, and January of 1954. This report discusses general physics research and the development and operation of the accelerator.
Date: March 11, 1954
Creator: Lawrence Radiation Laboratory. Physics Division.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Automatic Stabilization

Description: This report concerns the study of automatic stabilizers and extends it to include the control of the three-control system of the airplane instead of just altitude control. Some of the topics discussed include lateral disturbed motion, static stability, the mathematical theory of lateral motion, and large angles of incidence. Various mechanisms and stabilizers are also discussed.
Date: August 1936
Creator: Haus
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chief Characteristics and Advantages of Tailless Airplanes

Description: This study will be concerned with the critical examination of two main questions, mainly, susceptibility of centering and more generally, the conditions of static stability, longitudinal equilibrium, and the question of dynamic stability, or at least the damping of longitudinal vibrations about a position of equilibrium that may result from a small variation in the angle of attack.
Date: May 1936
Creator: Dufaure De Lajarte, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Survey of linear magnetic fusion reactors

Description: The promise and problems of Linear Magnetic Fusion (LMF) for the generation of electrical power are surveyed. A number of axial confinement schemes are described and compared on an n tau basis. Likewise, the range of heating methods is described. The results of seven conceptual LMF reactor design studies are summarized with an emphasis on the interfaces between reactor operation, confinement scheme, and heating methods.
Date: January 1, 1978
Creator: Krakowski, R. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TPC magnet cryogenic system

Description: The Time Projection Chamber (TPC) magnet at LBL and its compensation solenoids are adiabatically stable superconducting solenoid magnets. The cryogenic system developed for the TPC magnet is discussed. This system uses forced two-phase tubular cooling with the two cryogens in the system. The liquid helium and liquid nitrogen are delivered through the cooled load by forced tubular flow. The only reservoirs of liquid cryogen exist in the control dewar (for liquid helium) and the conditioner dewar… more
Date: March 1, 1980
Creator: Green, M.A.; Burns, W.A.; Taylor, J.D. & Van Slyke, H.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Report of the task force on quench protection and power supply operation

Description: This report presents the results of discussions during and work subsequent to a Workshop on Quench Analysis and Power Supply Operation held at the SSC-CDG on April 1-4, 1985. The major portion of this volume addresses quenches in the Design C and D magnets, as described in detail in Appendices A through H. Some work has been carried out on the power supply operation and the appropriate control philosophy as described in Appendices I through K. Further work will be required for a complete unders… more
Date: August 25, 1985
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ITER (International Thermonuclear Experimental Reactor) shield and blanket work package report

Description: This report summarizes nuclear-related work in support of the US effort for the International Thermonuclear Experimental Reactor (ITER) Study. The purpose of this work was to prepare for the first international ITER workshop devoted to defining a basic ITER concept that will serve as a basis for an indepth conceptual design activity over the next 2-1/2 years. Primary tasks carried out during the past year included: design improvements of the inboard shield developed for the TIBER concept, scopi… more
Date: June 1, 1988
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Neutron spectra from 647- and 800-MeV proton bombardment of hydrogen and deuterium. [Cross sections]

Description: Zero degree neutron spectra for the inclusive reactions p(p,n) and d(p,n) were obtained. Spectra were obtained for bombarding proton kinetic energies of 647 and 800 MeV. The strongly peaked p(p,n) spectra are well explained via the p(p,n)p..pi../sup +/ reaction primarily through the production of the N*/sub 33/(..delta../sup + +/) resonance. However, there is evidence for n-p final state interactions as well. Calculations have shown the roles of the N*/sub 33/ resonance and the n-p final state … more
Date: December 1, 1975
Creator: Bjork, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of large high current density superconducting solenoid magnets for use in high energy physics experiments.

Description: The development of a unique type of large superconducting solenoid magnet, characterized by very high current density windings and a two-phase helium tubular cooling system is described. The development of the magnet's conceptual design and the construction of two test solenoids are described. The successful test of the superconducting coil and its tubular cooling refrigeration system is presented. The safety, environmental and economic impacts of the test program on future developments in high… more
Date: May 1, 1977
Creator: Green, M. A.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Optical tuning in the arcs and final focus sections of the Stanford Linear Collider

Description: In this thesis, we present the experimental tuning procedures developed for the Arcs and for the Final Focus Section of the Stanford Linear Collider (SLC). Such tuning is necessary to maximize the luminosity, by minimizing the beam size at the interaction point, and to reduce backgrounds in the experiment. In the final Focus Section, the correction strategy must result from the principles of the optical design, which is based on cancellations between second order aberrations, and on the ability… more
Date: March 1, 1989
Creator: Bambade, P.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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