27 Matching Results

Search Results

Advanced search parameters have been applied.

Optimization of multiwire coil ends having 45 degree bends

Description: Multiwire is the name of a proprietary process for affixing small diameter wires to a flat substrate using digitally controlled machinery. It is currently being used to wind trim coils for the SSC dipoles on a flexible substrate which is wrapped around the beam tube. It is proposed for making multipole coils for the Corrector, a regular arc magnet in each half-cell of the Relativistic Heavy Ion Collider (RHIC). The current Multiwire process does not permit a change in direction of the wire other than 45 degree. The present paper answers the question of whether the 45 degree bends in the flattened coil can be located along straight lines in such a way as to eliminate or reduce higher harmonics in the ends. The more general question of bends located along curves is not addressed. 3 refs., 3 figs., 2 tabs.
Date: January 1, 1988
Creator: Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Collarless, close-in, shaped iron aperture designs for the SSC (Superconducting Super Collider) dipole

Description: The nominal-design SSC (Superconducting Super Collider) dipole encloses the coil in an iron yoke having a circular aperture. The radial gap between the coil and the iron is about 15 mm to provide space for a strong annular collar around the coil, and also to reduce the effects of iron saturation on central field harmonics. The 15 mm gap also reduces the desirable dipole field contributed by the iron. The present paper gives a coil and aperture configuration in which the gap is reduced to 5 mm at the midplane, in which the aperture is shaped to reduce the unwanted effects of iron saturation. The transfer function is increased about 5% at 6.6 Tesla and the unwanted harmonics are within SSC tolerances at all field levels. These designs would require that the yoke and containment vessel absorb the stresses due to assembly and magnetic forces. A short magnet is being built with a close-in shaped iron aperture and existing coil geometry to assess the benefits of this concept. 7 refs., 3 figs., 6 tabs.
Date: January 1, 1989
Creator: Gupta, R.C. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

A computer program for the 2-D magnetostatic problem based on integral equations for the field of the conductors and boundary elements

Description: The iterative design of the 2-dimensional cross section of a beam transport magnet having infinitely permeable iron boundaries requires a fast means of computing the field of the conductors. Solutions in the form of series expansions are used for rectangular iron boundaries, and programs based on the method of images are used to simulate circular iron boundaries. A single procedure or program for dealing with an arbitrary iron boundary would be useful. The present program has been tested with rectangular and circular iron boundaries and provision has been made for the use of other curves. It uses complex contour integral equations for the field of the constant-current density conductors and complex line integrals for the field of the piecewise-linear boundary elements. 2 refs., 4 figs., 1 tab.
Date: January 1, 1991
Creator: Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Field flattening in superconducting beam transport magnets

Description: Dipoles in which the beam traverses the midplane well away from tie magnet axis may benefit from flattening of the vertical field on the midplane. A procedure is described for doing so, making use of Chebyshev polynomials. In the case of the large aperture ``DX`` magnets located immediately on each side of the six intersection regions of the Relativistic Heavy Ion Powder (RHIC), a comparison is made of the field of coils optimized in this way and of coils optimized in the more common way by minimizing the leading coefficients of the Fourier expansion about the magnet axis. The comparison is of the integrated Fourier coefficients of the field expanded locally along the beam trajectory.
Date: December 31, 1994
Creator: Morgan, G. H.
Partner: UNT Libraries Government Documents Department

Design for a high field combined function superferric magnet

Description: A combined function superferric magnet option has been investigated for the Relativistic Heavy Ion Collider (RHIC). The option requires the maximum value of the field in the magnet to be much higher than that achieved in any existing combined function accelerator magnet. A model is presented here in which a good field quality can be maintained up to 2T. It is done by carefully designing the yoke structure and positioning the coils in such a way that the iron poles tend to saturate evenly across the gap. A cold iron model might be necessary for this magnet. 4 refs., 2 figs., 1 tab.
Date: January 1, 1985
Creator: Gupta, R.C. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Bending behavior of lapped plastic ehv cables

Description: One of the factors delaying the development of lapped polymeric cables has been their reputed poor bending characteristics. Complementary programs were begun at BNL several years ago to mathematically model the bending of synthetic tape cables and to develop novel plastic tapes designed to have moduli more favorable to bending. A series of bend tests was recently completed to evaluate the bending performance of several tapes developed for use in experimental superconducting cables. The program is discussed and the results of the bend tests are summarized.
Date: January 1, 1980
Creator: Morgan, G H & Muller, A C
Partner: UNT Libraries Government Documents Department

Magnetic properties of iron yoke laminations for SSC dipole magnets

Description: We examine the magnetic properties for the iron used in the SSC yoke laminations so that the accelerator tolerances can be met. The accelerator requirements for field quality specify a tolerance on the variation in the central field. At machine injection the variation in field is attributed to coercivity, H{sub c}. Requirements on the magnitude and the variation of H{sub c} are presented. At the 6.65 tesla operating field the variation in the saturation magnetization dominates the magnetic tolerance for the iron. 4 refs., 3 figs., 2 tabs.
Date: January 1, 1991
Creator: Kahn, S.A. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Improved 60 Hz superconducting power transmission cable

Description: The third in a series of 10 m, Nb/sub 3/Sn cables for ac power transmission has been installed in a horizontal, refrigerated cryostat. Like the two previous ones, this coaxial cable has its ends rigidly fixed so that it cannot contract axially on cooldown, and has two layers of superconducting helices and two layers of high purity aluminum helices for stabilization in each conductor. It differs from the previous one in having thicker electrical insulation (7.4 mm vs 3.6 mm), in having increased contact resistance between the superconducting layers to reduce ac loss, and in being driven by an external supply through horizontal, coaxial, vapor-cooled current leads. This is the final short cable prior to construction late this year of a 100 m cable which will be tested with high voltage and high current simultaneously. Results of current tests are presented, including ac loss at various temperatures and recovery from thermally induced quenches.
Date: January 1, 1980
Creator: Morgan, G.H.; Schauer, F. & Thomas, R.A.
Partner: UNT Libraries Government Documents Department

A comparison of calculations and measurements of the magnetic characteristics of the SSC (Superconducting Super Collider) design D dipole

Description: Measurements on two 4.5 m long design D dipoles are compared with computer calculations of their harmonics. These two magnets were tested at high fields, up to about 7.5 T, by subcooling.
Date: January 1, 1987
Creator: Gupta, R.C.; Morgan, G.H. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Design of double helix conductors for superconducting ac power transmission

Description: Coaxial cable conductors in the form of helical tape windings have been proposed in order to make Nb/sub 3/Sn cables which have flexibility and the ability to take up thermal contraction. For ac power transmission the axial magnetic fields which occur in a simple helical construction produce a number of undesirable consequences. It has been shown that these problems can be avoided by using double layer windings of opposite helicity, with 45/sup 0/ as the optimum helix angle. However, smaller values than this are desirable for mechanical reasons, and this paper extends the theory to include pitch angles less than 45/sup 0/. Measurements on short cable models are shown to be in reasonable agreement with calculation. The effect of current flow around the superconductor tape edges, which occurs in helical windings, is analyzed and it is shown that appreciable ac loss can arise if laminated tape with non-superconductive edges is used indiscriminately.
Date: January 1, 1976
Creator: Garber, M.; Bussiere, J. F. & Morgan, G. H.
Partner: UNT Libraries Government Documents Department

A single layer coil superconducting magnet for SSC (Superconducting Super Collider)

Description: The superconducting magnet under consideration for the proposed Superconducting Super Collider (SSC) uses a two layer coil geometry and is optimized for 6.6 T central field. In this paper we assess if it is possible to design a dipole having a realistic single layer coil configuration, using a cable having the same size as that used in the present SSC outer layer coil, can achieve a central field of about 6 T. The affirmative answer assumes a superconductor current density approaching the best achieved thus far in production, close-coupled cold iron with at most a very thin collar, a high but not unreasonable current density in copper at quench, and operation below 4.2 K. The performance under other operating conditions will also be discussed. We shall first describe the cable used in this design. We shall discuss the optimization procedure of the iron shape, particularly in the aperture region to minimize the effects of iron saturation. We shall outline the design of a realistic single layer coil geometry. Finally we shall discuss various operating parameters from the quench protection point of view.
Date: 1987
Creator: Gupta, R. C.; Morgan, G. H. & Thompson, P. A.
Partner: UNT Libraries Government Documents Department

Solar energy legal bibliography. Final report. [160 references]

Description: The Solar Energy Legal Bibliography is a compilation of approximately 160 solar publications abstracted for their legal and policy content (through October 1978). Emphasis is on legal barriers and incentives to solar energy development. Abstracts are arranged under the following categories: Antitrust, Biomass, Building Codes, Consumer Protection, Environmental Aspects, Federal Legislation and Programs, Financing/Insurance, International Law, Labor, Land Use (Covenants, Easements, Nuisance, Zoning), Local Legislation and Programs, Ocean Energy, Patents and Licenses, Photovoltaics, Solar Access Rights, Solar Heating and Cooling, Solar Thermal Power Systems, Standards, State Legislation and Programs, Tax Law, Tort Liability, Utilities, Warranties, Wind Resources, and General Solar Law.
Date: March 1, 1979
Creator: Seeley, D.; Euser, B.; Joyce, C.; Morgan, G. H.; Laitos, J. G. & Adams, A.
Partner: UNT Libraries Government Documents Department

Coil and iron design for SSC 50 mm magnet

Description: In this paper we present the design of the two dimensional coil and iron cross section, referred to as DSX201/W6733, for the 50 mm aperture dipole magnet being built at the Brookhaven National Laboratory for the Superconducting Super Collider (SSC). The computed values of the allowed field harmonics as a function of current, the quench performance predictions, the stored energy calculations, the effect of random errors on the coil placement and the Lorentz forces on the coil will be presented. The yoke has been optimized to reduce iron saturation effects on the field harmonics. We shall present the summary of this design which will include the expected overall performance of this cross section. 4 refs., 8 figs., 12 tabs.
Date: January 1, 1990
Creator: Gupta, R.C.; Kahn, S.A. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

SSC 50 mm dipole cross section

Description: In this paper we present the magnetic design of the two dimensional coil and iron cross section, referred to as DSX201/W6733, for the 50 mm aperture main ring dipole magnet for the Superconducting Super Collider (SSC). The computed values of the allowed field harmonics as a function of current, the quench performance predictions, the stored energy calculations, the effect of random errors on the coil placement and the Lorentz forces on the coil will be presented. The yoke has been optimized to reduce iron saturation effects on the field harmonics. We shall present the summary of this design which will include the expected overall performance of this cross section. Prototypes of these dipoles are being built at the Brookhaven National Laboratory (BNL) and at the Fermi National Accelerator Laboratory (FNAL). There are slight differences between the cross sections at the two laboratories. 7 refs., 6 figs., 11 tabs.
Date: January 1, 1991
Creator: Gupta, R.C.; Kahn, S.A. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Winding mandrel design for the wide cable SSC dipole

Description: The 50 mm coil i.d. SSC dipole magnets use wider cables to give a greater operational margin between quench field and operating field. The cable used for the inner coil has 30 strands of the same size (0.808 mm) instead of 23 and the outer has 36 strands of the same size (0.648 mm) instead of 30 and the cable widths are increased in proportion. Although the coil inner diameter has been increased from 40 mm, the coil ends are noticeably harder to wind. This report describes the computational and experimental effort to design winding mandrels or center posts for the constant-perimeter ends. 1 ref., 2 figs., 2 tabs.
Date: January 1, 1990
Creator: Morgan, G.H.; Greene, A.; Jochen, G. & Morgillo, A.
Partner: UNT Libraries Government Documents Department

New coil end design for the RHIC Arc dipole

Description: To simplify production, the number of parts in the ends, about 64 in each coil end, was reduced by using thicker spacers between the turns, to about 23. A new computer program was written which gives a description of each turn closely resembling the turn as made. The output of this program is processed by newly written computer programs which change the parts descriptions into forms which are used by a computer-controlled, 5-axis milling machine. The solid spacers replace spacers assembled from laminations and improve the fit as well. The parts will be molded during production. The calculated harmonic content of the ends is compared with measurements on the first magnets built with the new ends.
Date: June 1, 1994
Creator: Morgan, G. H.; Morgillo, A.; Power, K. & Thompson, P.
Partner: UNT Libraries Government Documents Department

A comparison of calculations and measurements of the field harmonics as a function of current in the SSC dipole magnets

Description: A large number of short and long superconducting dipole magnets for the Superconducting Super Collider (SSC) have been constructed and measured for their magnetic field properties at Brookhaven National Laboratory (BNL). In this paper we compare the calculations and measurements for the variation of field harmonics as a function of current in 40 mm aperture and 50 mm aperture dipole magnets. The primary purpose of this paper is to examine the iron saturation effects on the field harmonics. The field harmonics also change due to the persistent current in the superconducting wires and due to the deformation of the coil shape because of Lorentz forces. We discuss the variation in the sextupole harmonics (b{sub 2}) with current and explain the differences between the calculations and measurements. We also discuss the skew quadrupole harmonic at high field in the long dipole magnets. 3 refs., 3 figs., 1 tab.
Date: January 1, 1991
Creator: Gupta, R.C.; Cottingham, J.G.; Kahn, S.A.; Morgan, G.H. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Calculations of magnetic field for the end design of the RHIC arc dipole

Description: This paper describes the results of a 3D calculation of the magnetic field in the end region of the RHIC arc dipole magnet. Multipole harmonics are obtained in the end regions of the magnet. Comparisons of these harmonics are made to the measurements of harmonics on the actual magnets.
Date: September 1, 1993
Creator: Kahn, S. A.; Gupta, R. C.; Jain, A. K.; Morgan, G. H. & Thompson, P. A.
Partner: UNT Libraries Government Documents Department

Iron saturation control in RHIC dipole magnets

Description: The Relativistic Heavy Ion Collider (RHIC) will require 360 dipoles of 80 mm bore. This paper discusses the field perturbations produced by the saturation of the yoke iron. Changes have been made to the yoke to reduce these perturbations, in particular, decapole < 10{sup {minus}4}. Measurements and calculations for 6 series of dipole magnets are presented. 2 refs., 2 figs., 1 tab.
Date: January 1, 1991
Creator: Thompson, P.A.; Gupta, R.C.; Kahn, S.A.; Hahn, H.; Morgan, G.H.; Wanderer, P.J. et al.
Partner: UNT Libraries Government Documents Department