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AC Losses of Prototype HTS Transmission Cables

Description: Since 1995 Southwire Company and Oak Ridge National Laboratory (ORNL) have jointly designed, built, and tested nine, l-m long, high temperature superconducting (HTS) transmission cable prototypes. This paper summarizes the AC loss measurements of five of the cables not reported elsewhere, and compares the losses with each other and with theory developed by Dresner. Losses were measured with both a calorimetric and an electrical technique. Because of the broad resistive transition of the HTS tap… more
Date: September 13, 1998
Creator: Demko, J.A.; Dresner, L.; Hughey, R.L.; Lue, J.W.; Olsen, S.K.; Sinha, U. et al.
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Partner: UNT Libraries Government Documents Department
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Application of Electrical and Calorimetric Methods to the A.C. Loss Characterization of Cable Conductors

Description: Due to the higher currents (and therefore higher losses) compared to individual wires and tapes, the ac loss characterization of HTS cable conductors carrying transport current can be performed using calorimetric as well as electrical methods. We discuss the main features of two calorimetric methods, one based on temperature profile determination, and one, more recently developed, based on nitrogen boil-off rate, and of the electrical method, substantially derived from that already established … more
Date: September 13, 1998
Creator: Coletta, C.; Gherardi, L.; Gomory, F.; Cereda, E.; Ottoboni, V.; Daney, D. E. et al.
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Partner: UNT Libraries Government Documents Department
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Application of RF Superconductivity to High Current Linac

Description: In 1997, the authors initiated a development program in Los Alamos for high-current superconducting proton-linac technology to build prototypes components of this linac to demonstrate the feasibility. The authors are building 700-MHz niobium cavities with elliptical shapes, as well as power couplers to transfer high RF power to these cavities. The cavities and power couplers will be integrated in cryostats as linac cryomodules. In this paper, they describe the linac design and the status of the… more
Date: September 13, 1998
Creator: K.C.D., Chan
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Partner: UNT Libraries Government Documents Department
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Characterization of the Structure of Y-Ba-Cu-O Coated Conductors

Description: Transmission electron microscopy (TEM) has been applied to the microstructural investigation of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) thick films deposited on polycrystalline Ni-based metal substrates by pulsed laser deposition. The films were found to be strongly textured with c-axis oriented grains aligned perpendicular to the substrates. Despite the large average in-plane misorientation, as was estimated from selected area electron diffraction and x-ray diffraction, TEM inspection revea… more
Date: September 13, 1998
Creator: Kung, H. H.; Foltyn, S. R.; Arendt, P. N. & Maley, M. P.
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Partner: UNT Libraries Government Documents Department
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Electrical Potential Transfer Through Grounding and the Concern for Facility and Worker Safety

Description: Electrical grounding is probably the most over-looke~ ignored, and misunderstood part of electrical energy source circuits. A faulty ground circuit am have lethal potential to the worker, can damage electrical equipment" or components, and can lead to higher consequences. For example, if the green-wire ground return circuit (in a three-wire power circuit) is fhulty or is open (someone cut the prong, etc.) a person can receive an electrical shock by touching the conductive enclosure, and the res… more
Date: September 13, 1998
Creator: Konkel, Herbert
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Partner: UNT Libraries Government Documents Department
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First Results for a Novel Superconducting Imaging-Surface Sensor Array

Description: A superconducting imaging-surface system was constructed using 12 coplanar thin-film SQUID magnetometers located parallel to and spaced 2 cm from a 25 cm diameter lead imaging-plane. Some measurements included two additional sensors on the ''back'' side of the superconducting imaging-plane to study the field symmetry for our system. Performance was measured in a shielded can and in the open laboratory environment. Data from this system has been used to: (a) understand the noise characteristics … more
Date: September 13, 1998
Creator: Kraus, R.R.; Flynn, E.R.; Espy, M.A.; Matlashov, A.; Overton, W.; Peters, M.V. et al.
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Partner: UNT Libraries Government Documents Department
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High-Tc Coated Conductors - Performance of Meter-Long YBCO/IBAD Flexible Tapes

Description: One meter long tapes based on 50-100 {micro}m thick by 1 cm wide nickel alloy substrates have been coated in a continuous process with a textured yttria-stabilized zirconia layer by ion beam-assisted deposition, followed by a 1-2 {micro}m thick layer of YBCO by pulsed laser deposition. The best result to date is a tape with a critical current (I{sub c}) at 75 K of 96 A over an 87 cm measurement length. The overall critical current density and engineering current density are 1 MA/cm{sup 2} and 1… more
Date: September 13, 1998
Creator: Foltyn, S. R.; Arendt, P. N.; Dowden, P. C.; DePaula, R. F.; Groves, J. R.; Coulter, J. Y. et al.
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Partner: UNT Libraries Government Documents Department
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Implementation of the CEM-Code into the MCNPX-Code

Description: In the development stage of improving the physics abilities of MCNPX, the CEM code has been implemented into MCNPX as the nuclear reaction model for nuclei and pion induced reactions up to 5 GeV of kinetic energy. The CEM code includes all the reaction stages of intra:nuclear cascade, preequilibrium and equilibrium and is an alternative for the existing MCNPX models. The preliminary implementation fixes the uncompleted fission model of CEM by applying the RAL fission fragmentation model and pro… more
Date: September 13, 1998
Creator: Gallmeier, F.X.
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Partner: UNT Libraries Government Documents Department
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Improving analytical understanding through the addition of information: Bayesian and hybrid mathematics approaches

Description: Safety analysts frequently must provide results that are based on sparse (or even no) data. When data (or more data) become available, it is important to utilize the new information optimally in improving the analysis results. Two methods for accomplishing this purpose are Bayesian analysis, where "prior" probability distributions are modified to become "posterior" distributions based on the new data, and hybrid (possibilistic/probabilistic analysis) where possibilistic "membership" portrays th… more
Date: September 13, 1998
Creator: Cooper, J.A. & Diegert, K.V.
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Partner: UNT Libraries Government Documents Department
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A new paradigm to establish the safety basis for nuclear explosives operations

Description: The U. S. Department of Energy (DOE) has recognized that safety assurance requires a balance of institutional and engineering approaches as part of an ongoing safety process. This recognition formed the basis for a new approach to nuclear explosive safety with a focus on the inherent value of the examination process, as opposed to an absolute justification of the nuclear explosive operation against some preddined acceptance criteria. This new approach to safety is reflected in recent DOE Orders… more
Date: September 13, 1998
Creator: Fischer, Stewart R., Clement, Steven, Stack, Desmond W.
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Partner: UNT Libraries Government Documents Department
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A New Simplified System for the Evaluation of BNCT Pharmaceuticals

Description: A system for testing potential BNCT pharmaceuticals in cell cultures has been developed with the cooperation of Oak Ridge National Laboratory (ORNL), the University of Tennessee Chemistry Department and the University of Tennessee Nuclear Engineering Department. A BNCT test model has been established with the use of the human lung cancer cell line A 549. These cells were maintained in standard laboratory facilities and subjected to boronated chemicals. Following toxicity studies the human luug … more
Date: September 13, 1998
Creator: Byrne, T. E.; Kabalka, G. W.; Martin, R. C. & Miller, L. F.
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Partner: UNT Libraries Government Documents Department
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SQUIDs as Detectors in a New Experiment to Measure the Neutron Electric Dipole Moment

Description: A new experiment has been proposed at Los Alamos National Laboratory to measure the neutron electric dipole moment (EDM) to 4x10{sup {minus}28} ecm, a factor of 250 times better than the current experimental limit. Such a measure of the neutron EDM would challenge the theories of supersymmetry and time reversal violation as the origin of the observed cosmological asymmetry in the ratio of baryons to antibaryons. One possible design for this new experiment includes the use of LTC SQUIDs coupled … more
Date: September 13, 1998
Creator: Espy, M. A.; Cooper, M.; Lamoreaux, S.; Kraus, R. H., Jr.; Matlachov, A. & Ruminer, P.
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Partner: UNT Libraries Government Documents Department
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