2,315 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Electromagnets"  
Results: 1 - 24 next
open access

INEX simulations of the optical performance of the AFEL

Description: The AFEL (Advanced Free-Electron Laser) Project at Los Alamos National Laboratory is presently under construction. The project's goal is to produce a very high-brightness electron beam which will be generated by a photocathode injector and a 20 MeV rf-linac. Initial laser experiments will be performed with a 1-cm-period permanent magnet wiggler which will generate intense optical radiation near a wavelength of 3.7 {mu}m. Future experiments will operate with slotted-tube'' electromagnetic wiggle… more
Date: January 1, 1991
Creator: Goldstein, J.C.; Wang, T.S.F. & Sheffield, R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An update on passive correctors for the SSC dipole magnets

Description: The concept of correction of the magnetization sextupole became a topic of discussion as soon as it was realized that superconductor magnetization could have a serious effect on the SSC beam during injection. Several methods of correction were proposed. These included (1) correction with active bore tube windings like those on the HERA machine which correct out magnetization sextupole and the sextupole due to iron saturation, (2) correction with persistent sextupole windings mounted on the bore… more
Date: May 1, 1991
Creator: Green, Michael A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Potential for use of high-temperature superconductors in fusion reactors

Description: The present rate of development of high-temperature superconductors (HTSs) is sufficiently rapid that there may be opportunities for their use in contemporary fusion devices such as the International Thermonuclear Experimental Reactor (ITER). The most likely 1application is for delivering power to the superconducting magnets, especially in substituting for the current leads between the temperatures of 4 K and 77K. A second possible application of HTSs is as a liquid-nitrogen-cooled power bus, c… more
Date: January 1, 1991
Creator: Hull, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Power excitation by the use of a rf wiggler

Description: It is well-known that there are difficulties to obtain rf power sources of significant amount for frequencies larger than 3 GHz. Yet, rf sources in the centimeter/millimeter wavelength range would be very useful to drive, for example, high-gradient accelerating linacs for electron-positron linear colliders. We would like to propose an alternative method to produce such radiation. It makes use of a short electron bunch traveling along the axis of a waveguide which is at the same time excited by … more
Date: January 1, 1992
Creator: Ruggiero, Alessandro G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Conductor qualification tests for the 30-MJ Bonneville Power Administration SMES coil

Description: The 30-MJ energy storage coil for the Bonneville Power Administration requires a low-loss, cryostable conductor that is able to carry 4.9 kA in a field of 2.8 T and will maintain its properties over 10/sup 8/ partial discharge cycles. The multi-level cable which satisfies these requirements has been extensively tested at various stages in its development and in its final form. Tests have been performed to determine the effect of manufacturing options on ac losses, low temperature electrical res… more
Date: January 1, 1980
Creator: Schermer, R. I.; Boenig, H. J.; Henke, M.; Turner, R. D. & Schramm, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Estimates of SASE power in the short wavelength region

Description: Given a sufficiently bright electron beam, the self-amplified-spontaneous emission (SASE) can provide gigawatts of short wavelength coherent radiation. The advantages of SASE approach are that is requires neither optical cavity nor an imput seed laser. In this note, we estimate the peak power performance of SASE for wavelengths shorter than 1000 {Angstrom}. At each wavelength, we calculate the saturated power from a uniform parameter undulator and the enhanced power from a tapered undulator. Th… more
Date: March 1, 1992
Creator: Kim, Kwang-Je.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The U5. 0 undulator design for the advanced light source at LBL

Description: The U5.0 undulator, currently under design, is the first in a series of insertion devices planned for the Advanced Light Source at LBL. U5.0 parameters include a 5 cm period, 5 m length with a 0.837 T maximum field at a 14 mm gap. A hybrid configuration utilizing Nd-Fe-B permanent magnet material and Vanadium Permendur poles is used for the magnetic structure. Construction is modular with many pole assemblies attached to a pole mount, which in turn is fastened onto one of the backing beams. Ver… more
Date: August 1, 1989
Creator: Hoyer, E.; Chin, J.; Halbach, K.; Hassenzahl, W.; Humphries, D.; Kincaid, B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Conceptual design of a superconducting magnet coil for the large coil program. [Flat-wound NbTi coils]

Description: A conceptual design for a toroidal field (TF) coil for a six coil test array has been developed. The electromagnetic, cryogenic, structural, manufacturing, quality assurance and verification testing requirements have been analyzed. The bore is oval shaped and is 2.35 meters horizontally and 3.35 meters vertically. The coil is designed to operate at 8T peak field at rated current of 10450 amperes when the other 5 coils in the toroidal array are at 80% rated current. Using-flat-wound NbTi conduct… more
Date: January 1, 1977
Creator: Quay, R.; Bryant, R. W.; Koenig, R. F.; Ferrante, J. J.; Linkinhoker, C. L.; Donato, J. W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Optical design and performance of the X25 hybrid wiggler beam line at the NSLS

Description: The X25 beam line at the National Synchrotron Light Source (NSLS) began full-power commissioning in 1990. It extracts radiation from a 27 pole hybrid wiggler, which produces up to 1.8 kW of total power with a peak horizontal density of 450 W/mrad and critical energy of 4.6 keV. The design and performance of the beam line optics are described, in particular the cooling of the first monochromator crystal. 28 refs., 5 figs.
Date: January 1, 1991
Creator: Berman, L. E.; Hastings, J. B.; Oversluizen, T. & Woodle, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electron-beam envelopes and matching for a combined wiggler and alternating-gradient quadrupole channel

Description: This work studies the electron-beam envelopes and matching for a combined wiggler and alternating-gradient quadrupole field for a free-electron laser (FEL) that will be operated in the VUV or XUV wavelength region. The quadrupole field is assumed to vary continuously along the symmetry axis. The linearized equations of electron motion are solved analytically by using the two-scale perturbation method for a plane polarized wiggler. The electron-beam envelopes and the envelope equations, as well … more
Date: January 1, 1985
Creator: Wang, T. F. & Cooper, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Construction and testing of the Mirror Fusion Test Facility magnets

Description: This paper describes the construction and testing of the Mirror Fusion Test Facility superconducting magnet set. Construction of the first Yin Yang magnet was started in 1978. And although this particular magnet was later modified, the final construction of these magnets was not completed until 1985. When completed these 42 magnets weighed over 1200 tonnes and had a maximum stored energy of approximately 1200 MJ at full field. Together with power supplies, controls and liquid nitrogen radiation… more
Date: August 1, 1986
Creator: Kozman, T.; Shimer, D.; VanSant, J. & Zbasnik, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multi-layer universal correction magnet

Description: This paper presents an approach for constructing a universal correction magnet in which the return currents play an active role in determining the field. The return currents are not hidden by the iron shield. The coil is wound in many layers, instead of just one layer. Each layer has a particular symmetry, and generates a particular class of field multipoles such that the location of the return current for each independently excited current block is clear. Three layers may be sufficient in many… more
Date: August 1, 1981
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

H5 fast-kicker-magnet pulser

Description: The fast extraction kicker magnet for the AGS is powered by a novel pulse generator. A pulse forming network (PFN) is discharged into nearly 100% mismatched load. The pulser delivers a current pulse of 3000 amperes peak pulse with a 2% flat-top ripple into a 1.4 ..mu.. H single turn ferrite core magnet. The pulse is 2.8 ..mu..sec wide with a 180 nsec rise time, at a 0.5 to 1.5 pps repetition rate. The pulse rise time is required to provide clean extraction of the 28 GeV proton beam by bringing … more
Date: January 1, 1982
Creator: Frey, W.; Ghoshroy, S. & Cottingham, J.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

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

Performance of trim coils made by a novel method

Description: A precision, automated method of manufacturing trim coils based on printed circuit technology has been developed. Excellent quench performance and increased radiation resistance have been achieved in recently-tested models of sextupole trim coils developed for operation inside 40 mm-aperture SSC Main Collider dipoles. 6 refs., 2 figs.
Date: January 1, 1991
Creator: Wanderer, P.; Anerella, M.; Cottingham, J.; Ganetis, G.; Garber, M.; Ghosh, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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

Fabrication of a 180/sup 0/ electron scattering facility. Final report, January 2, 1975--January 1, 1978

Description: A system of four dipole magnets to be used for 180/sup 0/ electron scattering studies at the 400 MeV William F. Bates Electron Linear Accelerator of Middleton, Massachusetts was constructed and tested. The first three magnets through which the incident beam passes have similar pole shapes and serve only as beam transport elements. The fourth magnet directs the incident beam onto a target, and also receives and deflects the backscattered electrons into a large magnetic spectrometer operating in … more
Date: January 1, 1978
Creator: Peterson, G A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Advanced Light Source U8 beam line, 20--300 eV

Description: The U8 is a beam line under construction at the Advanced Light Source (ALS). The beam line will be described along with calculations of its performance and its current status. An 8 cm period undulator is followed by two spherical collecting mirrors, an entrance slit, spherical gratings having a 15{degree} deviation angle, a moveable exit slit, and refocusing and branching mirrors. Internal water cooling is provided to the metal M1 and M2 mirrors as well as to the gratings. Calculations have bee… more
Date: October 1, 1991
Creator: Heimann, P.; Warwick, T.; Howells, M.; McKinney, W.; Digennaro, D.; Gee, B. et al.
Item Type: Refine your search to only Article
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

The Fresh-Bunch' technique in FELs

Description: The 'Fresh Bunch' technique is being proposed as a method of increasing the gain and power of FEL amplifiers in which the length of the optical radiation pulse is shorter than the length of the electron bunch. In multi-stage FEL, electron beam energy spread is increased by the FEL interaction in the early stages. In the 'Fresh Bunch' technique, the low energy spread of the electron beam is recovered by shifting the radiation pulse to an undisturbed part of the electron bunch, thus improving the… more
Date: January 1, 1991
Creator: Ben-Zvi, Ilan; Yang, K. M. & Yu, L. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen