2,342 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Electromagnets"  
prev Results: 2065 - 2088 next
open access

Effects of low-temperature fusion neutron irradiation on critical properties of a monofilament niobium-tin superconductor

Description: The objective of this work was to irradiate a Nb/sub 3/Sn superconductor with 14.8 MeV neutrons at 4 K and measure critical current in transverse fields of up to 12 T, irradiating up to a fluence sufficient to decrease the critical current to below its initial value. Critical temperatures were also to be measured. The samples were to be kept near 4 K between the irradiation and the measurement of critical properties. This work is directed toward establishing an engineering design fluence limit … more
Date: March 22, 1984
Creator: Guinan, M.W.; Van Konynenburg, R.A. & Mitchell, J.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mirror fusion. Quarterly report, April-June 1981

Description: The information in each Quarterly is presented in the same sequence as in the Field Work Package Proposal and Authorization System (WPAS) submissions prepared for the U.S. Department of Energy; the main sections are Applied Plasma Physics, Confinement Systems, Development and Technology, and Mirror Fusion Test Facility (Planning and Projects). On occasion, we shall include information pertaining to the LLNL role as Lead Laboratory for the Open Systems Mirror Fusion Program. Each of these sectio… more
Date: September 11, 1981
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Engineering considerations of the advanced free electron laser facility

Description: The Advanced Free-Electron Laser (AFEL) is being built at Los Alamos inside a large laboratory building. In addition to cost and available space considerations, several engineering issues affected the design of the AFEL and its facility. The 1300-MHz, 20-MeV electron linac required extensive radiation shielding and a short rf-waveguide run. Free-Electron Lasers (FEL) and photocathode-drive laser optics required a clean, constant temperature environment. New environmental, health, and safety (ES… more
Date: January 1, 1991
Creator: Meier, K.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

RF-GD/FTMS: An FTMS system with a lensless external ion source for high resolution elemental mass spectrometry

Description: Two of the major challenges which face the field of elemental mass spectrometry are the development of versatile atomization/ionization sources for direct solids analysis and methods for reducing the impact of isobaric interferences found on commonly employed quadrupole and sector based instruments. The combination of radio frequency glow discharge (RF-GD) sources with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR or FTMS) is one technique which addresses both problems. A … more
Date: January 1, 1991
Creator: Weller, R. R.; Pochkowski, J. M.; Duckworth, D. C.; Marcus, R. K. & Buchanan, M. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Superconducting magnets in high radiation environments: Design problems and solutions

Description: As part of the Stanford Linear Collider Project, three high-field superconducting solenoid magnets are used to rotate the spin direction of a polarized electron beam. The magnets are installed in a high-radiation environment, where they will receive a dose of approximately 10{sup 3} rad per hour, or 10{sup 8} rad over their lifetimes. This level of radiation and the location in which the magnets are installed, some 10 meters below ground in contiguous tunnels, required careful selection of mate… more
Date: November 1, 1989
Creator: St. Lorant, S.J. & Tillmann, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Results from a model system of superconducting solenoids and phase shifting bridge for pulsed power studies for proposed tokamak EF coils

Description: A matched pair of superconducting solenoids and a phase-shifting bridge circuit has been constructed to study energy storage and transfer for application to tokamak EF coils. The intrinsically stable solenoids, each with 4 H self-inductance, incorporate sufficient cooling to allow charging at several hundred volts, corresponding to B = 1 T/sec. The three-phase inductor-convertor capacitive bridge network operating at up to 150 V rms transfers energy reversibly and at controllable rates from the… more
Date: January 1, 1977
Creator: Fuja, R. E.; Kustom, R. L. & Smith, R. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-field, high-density tokamak power reactor

Description: A conceptual design of a compact (R/sub 0/ = 6.0 m) high power density (average P/sub f/ = 7.7 MW/m/sup 3/) tokamak demonstration power reactor has been developed. High magnetic field (B/sub t/ = 7.4 T) and moderate elongation (b/a = 1.6) permit operation at the high density (n(0) approximately 5 x 10/sup 14/ cm/sup -3/) needed for ignition in a relatively small plasma, with a spatially-averaged toroidal beta of only 4%. A unique design for the Nb/sub 3/Sn toroidal-field magnet system reduces t… more
Date: November 1977
Creator: Cohn, D. R.; Cook, D. L.; Hay, R. D.; Kaplan, D.; Kreischer, K.; Lidskii, L. M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pressurized helium II-cooled magnet test facility

Description: A facility for testing superconducting magnets in a pressurized bath of helium II has been constructed and operated. The cryostat accepts magnets up to 0.32 m diameter and 1.32 m length with current to 3000 A. In initial tests, the volume of helium II surrounding the superconducting magnet was 90 liters. Minimum temperature reached was 1.7 K at which point the pumping system was throttled to maintain steady temperature. Helium II reservoir temperatures were easily controlled as long as the temp… more
Date: June 1, 1980
Creator: Warren, R.P.; Lambertson, G.R.; Gilbert, W.S.; Meuser, R.B.; Caspi, S. & Schafer, R.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Induction linac drivers for commercial heavy-ion beam fusion

Description: This paper discusses induction linac drivers necessary to accelerate heavy ions at inertial fusion targets. Topics discussed are: driver configurations, the current-amplifying induction linac, high current beam behavior and emittance growth, new considerations for driver design, the heavy ion fusion systems study, and future studies. 13 refs., 6 figs., 1 tab. (LSP)
Date: November 1, 1987
Creator: Keefe, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Cold-pressure-welded joints in large multifilamentary Nb--Ti superconductors

Description: A number of mechanical and electrical measurements were made on joints in typical conductors for the proposed mirror fusion test facility (MFTF) and high field test facility (HFTF). For such measurements, a commercially available cold-pressure-welding machine was used. For joints in the MFTF conductor, which has a large proportion of superconductor, joint strength approached conductor strength. For the HFTF conductor, where the Cu-to-superconductor ratio is 4.33/1, the joint is stronger than th… more
Date: September 22, 1977
Creator: Cornish, D.N.; Deis, D.W. & Zbasnik, J.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mechanical characterization of selected adhesives and bulk materials at liquid nitrogen and room temperatures

Description: This paper presents the results of a series of mechanical tests on selected adhesives and bulk materials. The materials tested are of general interest to designers of magnets for cryogenic service and include several epoxies, a varnish, a B-stage glass cloth, insulation papers, and commercially available fiber-reinforced composites. These tests were performed at room temperature (293 K) and at liquid nitrogen temperature (77 K). The tests include both simple tension tests and lap shear tests wi… more
Date: January 1, 1977
Creator: Fitzpatrick, C.M. & Stoddart, W.C.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

INEX (integrated numerical experiment) simulations of the Los Alamos HIBAF (high-brightness accelerator free-electron laser) free-electron laser MOPA (master oscillator power amplifier) experiment

Description: We present results of Integrated Numerical Experiment (INEX) simulations of the performance of a 1-m untapered wiggler FEL oscillator driving a 2-m wiggler FEL amplifier for the new HIBAF (High-Brightness Accelerator Free-Electron Laser) facility at Los Alamos. INEX simulations utilize a numerically-generated electron micropulse, from ISIS/PARMELA calculations of the photoinjector/linac/beam transport system, in the 3-D FEL simulation code FELEX. 13 refs., 10 figs., 1 tab.
Date: January 1, 1989
Creator: Goldstein, J.C.; Carlsten, B.E. & McVey, B.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characteristics of the 7-GeV advanced photon source: A guide for users

Description: In this document we present the characteristics of the electromagnetic radiation from various types of sources on the 7-GeV Advanced Photon Source (APS) storage ring. The sources include bending magnets, undulators, and wigglers. The characteristics are compared with those of other synchrotron sources when operated at their design specifications. The influence of positron beam size on the on-axis brilliance is discussed, along with the power distribution from these sources. The goal of this doc… more
Date: February 1, 1988
Creator: Shenoy, G. K.; Viccaro, P. J. & Mills, D. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Manufacturing and quality assurance for the MFTF superconductor core

Description: A total of 55,000 m of multifilamentary Nb-Ti superconductor in minimum lengths of 380 m are required for the Mirror Fusion Test Facility. This conductor is a large cross-section monolith and, as such, has presented several new manufacturing challenges. In addition, a monolith requires more stringent quality assurance procedures than braids or cables. This paper describes the manufacturing steps and the quality assurance program which have been developed for the MFTF superconductor core.
Date: November 1, 1979
Creator: Scanlan, R. M.; Johnston, J. E.; Waide, P. A.; Zeitlin, B. A.; Smith, G. B. & Nelson, C. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A 10,000 A 1000 VDC solid state dump switch

Description: The superconducting magnet test program at Fermilab requires a switch, called a dump switch, rated 10,000 A, 1000 Vdc, which must be able to continuously carry rated current. A dump resistor rated 2 MJoules, is connected in parallel with the switch contacts and dissipates the stored energy from a magnet when the switch opens. The required switch opening time is 250 {mu}sec maximum after detection of a fault or a trip command. A successful switch can be constructed from six parallel inverter typ… more
Date: May 1, 1991
Creator: Visser, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance of the Phase 1 superconducting x-ray lithography source (SXLS) at BNL

Description: The Phase I SXLS electron storage ring has a circumference of 8.5 meters, it uses conventional dipole magnets, B {le} 1.1 T and p = 60 cm, and it is capable of operating in the range of 50--250 MeV. It is the forerunner of the Phase II SXLS ring which will operate at 700 MeV and will make use of superconducting dipoles, B{sub o} = 3.87 Tesla, as a source of {lambda}{sub c} = 10 angstrom x-rays for proximity printing lithography. The Phase I storage ring has been successfully commissioned; store… more
Date: January 1, 1992
Creator: Murphy, J.B.; Biscardi, R.; Halama, H.; Heese, R.; Kramer, S.; Nawrocky, R. (Brookhaven National Lab., Upton, NY (United States)) et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Computation applied to particle accelerator simulations

Description: The rapid growth in the power of large-scale computers has had a revolutionary effect on the study of charged-particle accelerators that is similar to the impact of smaller computers on everyday life. Before an accelerator is built, it is now the absolute rule to simulate every component and subsystem by computer to establish modes of operation and tolerances. We will bypass the important and fruitful areas of control and operation and consider only application to design and diagnostic interpre… more
Date: July 1, 1991
Creator: Herrmannsfeldt, W.B. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)) & Yan, Y.T. (Superconducting Super Collider Lab., Dallas, TX (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Some fast beam kicker magnet systems at SLAC

Description: The Stanford Linear Collider requires very fast rise and fall times from its kicker magnets. The damping rings and positron source need either one or two bunches deflected from two or three that are separated in time by about 59 ns. The final focus region kicker magnets need a rise time of less than 700 ns and each one deflects only one bunch. This paper discusses the design and characteristics of a thyratron-switched, castor-oil-filled, coaxial, Blumlein line used for one bunch kicking. It dis… more
Date: January 1, 1987
Creator: Bulos, F.; Cassel, R. L.; Donaldson, A. R.; Genova, L. F.; Grant, J. A.; Mihalka, A. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Optimization method for orbit correction in accelerators

Description: The authors present a method to minimize the corrector strengths required to reduce the rms beam orbit. Any least square correction method will usually lead to undesirably strong corrector settings. The method, they are presenting, minimizes the total kick vector by finding the eigensolutions of the equation X = A[theta], where X is the orbit change vector [theta] is the kick vector and A is the response matrix. Since A is not necessarily a symmetric or even square matrix they symetrize the mat… more
Date: January 1, 1993
Creator: Bozoki, E. & Friedman, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

PEP II RF system

Description: State II of PEP consists of adding a superconducting proton storage ring to the electron-positron ring now completing construction. To obtain the desired luminosity between the tightly bunched electron beam and the protons, the protons will be tightly bunched also. The proton bunch length and the number of bunches imposes unusual requirements on the RF system. Acclerating to full proton energy makes the bunching easier.
Date: March 1, 1979
Creator: Hartwig, E.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Coherent-state description of free-electron lasers

Description: Free-electron lasers (FEL) have great advantages over traditional lasers because they have proved to be by far the most efficient way to generate coherent radiations which are also tunable over the widest range of frequencies. This is made possible by eliminating the middle-man,'' i.e., the atoms, molecules, or crystals in the traditional laser systems. Using quantum mechanical analysis, Maydey first explained the gain mechanism in propagating relativistic electrons through a static periodic ma… more
Date: January 1990
Creator: Lee, Ching Tsung (Alabama A and M Univ., Normal, AL (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

9. 1-T iron-free Nb-Ti dipole magnet with pancake windings

Description: An eight-pancake Nb-Ti dipole magnet, with bent up ends, called D-108B has been built and tested. This magnet is a Nb-Ti version of a Nb/sub 3/Sn magnet designed to produce a 10-tesla dipole field in a 40 mm diameter aperture. The pancack design is used for the heavy 12,000 ampere Nb/sub 3/Sn cable because of the mechanical difficulty in winding such a heavy cable into the conventional nested cylindrical shell configuration with a 2'' inner winding diameter. The Nb-Ti version operates at 1.8K, … more
Date: March 1, 1983
Creator: Gilbert, W.; Caspi, S.; Hassenzahl, W.; Meuser, R.; Peters, C.; Rechen, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen