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Survey of failure experience in existing superconducting magnet systems and its relevance to fusion power reactors

Description: Details of existing superconducting magnet failures are collected and evaluated with regard to future CTR superconducting magnet safety and reliability. Fourteen magnet systems with sixteen failures are presented. These failures are analyzed and categorized as to causative factors (e.g. hot spots, arcing, lead failures, and conductor movement). Responses of the instrumentation and protection systems during these accident situations are also presented. Repairs and present status of the magnets a… more
Date: August 17, 1976
Creator: Hsieh, S Y; Allinger, J; Danby, G; Keane, J; Powell, J & Prodell, A
Partner: UNT Libraries Government Documents Department
open access

Sub-nanosecond plastic scintillator time response studies using laser produced x-ray pulsed excitation

Description: The light emission time response of quenched NElll plastic scintillators has been measured using a streak camera (20 ps resolution) and 100 to 180 ps, 1.06 ..mu..m, laser-produced, pulsed, low energy x-ray excitation. Each light output pulse was obtained by deconvolution from the film data using the x-ray temporal response measured with an x-ray sensitive streak camera (10 ps resolution). Time response parameters are presented for benzophenone and acetophenone, quenching agents which most effec… more
Date: November 17, 1976
Creator: Tirsell, K. G.; Tripp, G. R.; Lent, E. M.; Lerche, R. A.; Cheng, J. C.; Hocker, L. et al.
Partner: UNT Libraries Government Documents Department
open access

Experimental searches for magnetic monopoles. [Mass, probability, review]

Description: Analysis of the sensitivity of previous negative searches for magnetic monopoles shows that they constitute prior evidence against the monopole interpretation of the event reported as ''evidence for detection of a moving magnetic monopole''. The strength of the evidence varies with the unknown mass of the monopole. For M less than or equal to 10/sup 5/ GeV, odds are greater than 10/sup 6/ : 1 against. For larger masses, the limits depend strongly on assumptions about the range of monopoles and … more
Date: February 17, 1976
Creator: Ross, R. R.
Partner: UNT Libraries Government Documents Department
open access

Brookhaven superconducting cable test facility

Description: Construction has started on an outdoor testing station for flexible ac superconducting power transmission cables. It is intended to serve as an intermediate step between laboratory-scale experiments and qualification testing of prototype-scale cables. The permanent equipment includes a 500 W supercritical helium refrigerator using a screw compressor and multistage turbine expanders. Helium storage for 250,000 cu ft of helium at 250 psi is provided. Initially, the cables will be tested in a hori… more
Date: August 17, 1976
Creator: Forsyth, E. B. & Gibbs, R. J.
Partner: UNT Libraries Government Documents Department
open access

Energy losses in mixed matrix superconducting wires under fast pulsed conditions

Description: Energy losses have been measured on a set of mixed matrix (CuNi, Cu, NbTi) superconducting wires at B's up to 1.5 x 10/sup 7/ G/s. The losses have been measured as a function of wire diameter, twist pitch, maximum applied field, and B. Both static and dynamic losses were measured for a field applied perpendicularly to the wire axis. The dynamic losses were measured by slowly applying an external field to a sample and then causing the field to decay exponentially in roughly 1 ms to 10 ms. Under … more
Date: August 17, 1976
Creator: Wollan, J. J.
Partner: UNT Libraries Government Documents Department
open access

What can be expected from high-Z semiconductor detectors. [Assessment of promising semiconductor materials; 25 references]

Description: It has been hoped that high-Z semiconductors would offer efficient ..gamma..-ray detection at or near ambient temperatures with energy resolution significantly better than NaI (Tl) scintillators. For use at X-ray energies, this goal has been achieved with both HgI/sub 2/, CdTe, and GaAs detectors. However, at higher energies (approximately 660 keV) all current detectors have one or more significant deficiencies in terms of attainable volume, charge collection efficiency, and polarization effect… more
Date: November 17, 1976
Creator: Armantrout, G. A.; Swierkowski, S. P.; Sherohman, J. W. & Lee, J. H.
Partner: UNT Libraries Government Documents Department
open access

Development of multifilamentary Nb/sub 3/Sn conductors for fusion research

Description: A program at Lawrence Livermore Laboratory to develop multifilamentary Nb/sub 3/Sn conductors suitable for use in constructing fusion research magnets has resulted in the commercial production of conductors having cross-sectional areas in the range 0.06 cm/sup 2/ to 0.84 cm/sup 2/. Critical current densities near the goal of 10/sup 4/ A/cm/sup 2/ at 12 T and 4.2 K have been obtained in conductors produced by two different techniques. The latest results of this program are presented and discusse… more
Date: August 17, 1976
Creator: Cornish, D. N.; Deis, D. W.; Nelson, R. L.; Scanlan, R. M.; Taylor, C. E.; Vandervoort, R. R. et al.
Partner: UNT Libraries Government Documents Department
open access

Elmo Bumpy Torus Reactor. [Reference design]

Description: In the Elmo Bumpy Torus Reactor (EBTR) study the feasibility of achieving a fusion power plant based on the EBT confinement concept was evaluated. If the present understanding of the physics can be extrapolated to reactor scale devices the reactor could operate at high beta, high power density, and at steady state. The high aspect ratio of the device eases the accessibility, structural design and remote maintenance problems which are common to low aspect ratio machines. A version of the EBTR re… more
Date: September 17, 1976
Creator: McAlees, D. G.; Uckan, N. A. & Lidsky, L. M.
Partner: UNT Libraries Government Documents Department
open access

Laser fusion overview. [Forecasting of laser fusion feasibility]

Description: Because of recent breakthroughs in the target area, and in the glass laser area, the scientific feasibility of laser fusion--and of inertial fusion--may be demonstrated in the early 1980's. Then the development in that time period of a suitable laser (or storage ring or other driving source) would make possible an operational inertial fusion reactor in this century. These are roughly the same time scales as projected by the Tokamak magnetic confinement approach. It thus appears that the 15-20 y… more
Date: May 17, 1976
Creator: Nuckolls, J.
Partner: UNT Libraries Government Documents Department
open access

Development of low-loss Nb/sub 3/Sn for ac power transmission: a review

Description: A superconducting cable incorporating Nb/sub 3/Sn is briefly described and requirements for the superconductor discussed. State of the art metallurgical procedures for reducing ac losses and increasing critical currents of Nb/sub 3/Sn are reviewed. The loss behavior is then related to presently available theoretical models and shown to depend largely on surface currents which are attributed to the surface barrier. Effects of temperature, trapped magnetic flux, cladding, and cable configuration … more
Date: August 17, 1976
Creator: Bussiere, J F
Partner: UNT Libraries Government Documents Department
open access

500 MHz modulation system for the 6 MeV, 700 A Astron Accelerator

Description: An rf system is described for the 500-MHz cylindrical resonator that is coupled to the Astron beam to modulate its energy by +- 1.5 percent.
Date: May 17, 1976
Creator: Reginato, L. L. & Smith, B. H.
Partner: UNT Libraries Government Documents Department
open access

Summary report of BCC ion correlation experiment. [800 to 1000/sup 0/C; voids; swelling; Ni/sup 2//sup+/, Mo/sup+/, Cu/sup 4//sup+/, and H/sup+/ ions]

Description: An interlaboratory program was established to compare the radiation damage produced in Mo at 800 to 1000/sup 0/C by different ions of different energies. The program included comparisons of microstructures produced by different ions, of measurements on a round robin TEM specimen, and of measurements on a common micrograph. Results are discussed. Ions used included Ni/sup 2 +/, Mo/sup +/, Cu/sup 4 +/, and H/sup +/.
Date: August 17, 1976
Creator: Brimhall, J L
Partner: UNT Libraries Government Documents Department
open access

Ultra high-current superconducting cables for a 2. 2-Tesla, 300-kilojoule energy storage magnet

Description: These 2.2-T, 300-kJ magnets are to operate at 10 to 12 kA with a safety factor in critical current of about 50 percent at 10 kA. The conductor must exhibit low losses in addition to being stable. Magnetic Corporation of America (MCA) designed a flat conductor using 1224 copper-matrix, monofilament wires combined in two stages of cabling followed by two stages of flat braiding. Two of these conductors were constructed, one with wire already on hand and the second using wire made specifically for… more
Date: August 17, 1976
Creator: Miranda, G. A.; Rhodenizer, R.; Rackov, P.; Punchard, W. F. B. & de Winter, T. A.
Partner: UNT Libraries Government Documents Department
open access

ESCAR mid-term report

Description: A status report is given of the design and fabrication of a small pilot-project accelerator and storage ring using superconducting magnets. The project is called ESCAR, for Experimental Superconducting Accelerator Ring. Work is reported on a pre-production dipole magnet, a 1500W helium refrigeration plant, planned major systems tests, and conventional component development. (PMA)
Date: August 17, 1976
Creator: Elioff, T.; Byrns, R. A.; Gilbert, W. S.; Lambertson, G. R. & Meuser, R. B.
Partner: UNT Libraries Government Documents Department
open access

Helium generation and diffusion in graphite and some carbides. [14. 9 and 14. 4 MeV neutrons]

Description: The cross section for the generation of helium in neutron irradiated carbon was found to be 654 mb at 14.4 MeV and 744 mb at 14.9 MeV. Extrapolating to 14.1 MeV (the fusion reactor spectrum) gives 615 mb. The diffusion of helium in dense polycrystalline graphite and in pyrographite was measured and found to be D = 7.2 x 10/sup -7/ m/sup 2/s/sup -1/ exp (-80 kJ/RT). It is assumed that diffusion is primarily in the basal plane direction in crystals of the graphite. In polycrystalline graphite the… more
Date: September 17, 1976
Creator: Holt, J. B.; Guinan, M. W.; Hosmer, D. W.; Condit, R. H. & Borg, R. J.
Partner: UNT Libraries Government Documents Department
open access

Magnetic field profiles of NbTi tapes

Description: Magnetic field profile measurements were performed on stabilized NbTi tapes in zero applied field carrying large transport current densities. Field profile data were taken on large diameter superconducting sample loops at temperatures between 2/sup 0/K and T/sub c/ (about 9.2/sup 0/K) and several persistent currents up to I/sub c/(T), the maximum. The field profiles scaled with current, independent of temperature, at temperatures below 8.5/sup 0/K and were well described by an elliptical shell … more
Date: August 17, 1976
Creator: Migliori, A.; Taylor, R. D. & Bartlett, R. D.
Partner: UNT Libraries Government Documents Department
open access

Flow through porous media from a nuclear cavity

Description: The transport of fluid from the cavity formed by an underground nuclear explosion is investigated. Driven by the high cavity pressure, steam and noncondensing gas enter the surrounding porous medium. Their subsequent motion through the medium is described and the extent of penetration determined. The relations governing the transport are presented. An implicit iterative computational method is developed. The relative merits of this technique are discussed. The method is applied to a nuclear tes… more
Date: October 17, 1976
Creator: Morrison, F. A., Jr.
Partner: UNT Libraries Government Documents Department
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