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Development of superconductors for applications in high-field, high-current-density magnets for fusion research

Description: The development of large-bore, high-field magnets for fusion energy applications requires a system approach to both magnet and conductor design. At Lawrence Livermore National Laboratory (LLNL), the criteria used to choose superconductors include: strain tolerance, radiation tolerance, heat removal, stability, fabricability, and cost. We report on the performance of industrially produced, prototype, Ti-modified Nb/sub 3/Sn wires developed with LLNL support. Wire performance characteristics eval… more
Date: September 26, 1986
Creator: Summers, L. T. & Miller, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Liquid to gas leak ratios with liquid nitrogen and liquid helium

Description: To predict the leak rates of liquid helium and liquid nitrogen containers at operating conditions we need to know how small leaks (10/sup -8/ to 10/sup -5/ atm-cm/sup 3/ air/s), measured at standard conditions, behave when flooded with these cryogens. Two small leaks were measured at ambient conditions (approx.750 Torr and 295 K), at the normal boiling points of LN/sub 2/ and LHe, and at elevated pressures above the liquids. The ratios of the leak rates of the liquids at ambient pressure to the… more
Date: February 26, 1985
Creator: Batzer, T. H. & Call, W. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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LLNL high-field coil program

Description: An overview is presented of the LLNL High-Field Superconducting Magnet Development Program wherein the technology is being developed for producing fields in the range of 15 T and higher for both mirror and tokamak applications. Applications requiring less field will also benefit from this program. In addition, recent results on the thermomechanical performance of cable-in-conduit conductor systems are presented and their importance to high-field coil design discussed.
Date: March 26, 1986
Creator: Miller, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impact of several reactor features on TF coil design for TPSS

Description: A significant driver of machine size in previous designs was the amount of nuclear shielding placed between the blanket and the toroidal field (TF) coils to minimize the radiation heating and damage in these critical components. Of course the total amount of shielding is not arbitrary; it certainly must adequately suppress radiation outside the plant. However, if all of this shielding were contained inside the TF coils, several parameters (coil size and weight, maximum field at the windings, st… more
Date: March 26, 1986
Creator: Miller, J. R. & Bulmer, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Conceptual studies of toroidal field magnets for the tokamak experimental power reactor. Final report

Description: This report documents the principal results of a Conceptual Design Study for the Superconducting Toroidal Field System for a Tokamak Experimental Power Reactor. Two concepts are described for peak operating fields at the windings of 8 tesla, and 12 tesla, respectively. The design and manufacturing considerations are treated in sufficient detail that cost and schedule estimates could be developed. Major uncertainties in the design are identified and their potential impact discussed, along with r… more
Date: October 26, 1976
Creator: Buncher, B. R.; Chi, J. W. H. & Fernandez, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conceptual design of a 400-GeV version of ISABELLE

Description: A conceptual design report is given for 400 x 400 GeV proton-proton storage rings. A facility is described with twice the energy capability of the recently proposed ISABELLE. The basic accelerator lattice was modified so that the circumference of the magnet rings can be increased substantially without an increase in the transition energy. Each 400 GeV ring uses superconducting magnets of the type described in the ISABELLE Proposal, but energized to 50 kG. Other technical features are not signif… more
Date: April 26, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Design and Testing of the 1.5 T Superconducting Solenoid for the BaBar Detector at Pep-II in SLAC

Description: The 1.5 Tesla superconducting solenoid is part of the BABAR Detector located in the PEP-II B-Factory machine at the Stanford Linear Accelerator Center. The solenoid has a 2.8 m bore and is 3.7 m long. The two layer solenoid is wound with an aluminum stabilized conductor which is graded axially to produce a {+-} 3% field uniformity in the tracking region. The 24 month fabrication, 3 month installation and 1 month commissioning of the solenoid were completed on time and budget. This paper summari… more
Date: January 26, 2001
Creator: O'Connor, T. G.; Shen, S.; Fabbricatore, P.; Farinon, S.; Musenich, R.; Priano, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design of cryogenic heat exchangers for a superconducting magnet

Description: Computer programs were written to design and simulate the behavior of three heat exchangers for cooling supercritical helium to approximately 4.3/sup 0/K at 4 atm. Helium, at 1, 3, or 5 gm/sec, is cooled by passing it through 0.635-cm-diam copper tubing immersed in a liquid nitrogen bath, through a copper, concentric tube, counter-current heat exchanger, and then through 0.635-cm copper tubing immersed in a liquid helium bath. The helium then enters a superconducting test magnet and finally pas… more
Date: October 26, 1976
Creator: Chrusciel, W. A.; Tao, B. Y. & Ventura, S. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cryogenic system for the mirror fusion test facility

Description: The Mirror Fusion Test Facility (MFTF), currently being constructed at the Lawrence Livermore Laboratory, has large superconducting magnets, cryopanels, and supporting cryogenic equipment that will comprise one of the world's largest liquid helium (LHe) systems. The facility will provide mirror magnetic confinement for experimental fusion plasmas that will be approximately the same physical size as if in a conceptual fusion reactor. The cryogenic system typifies the magnitude and makeup of syst… more
Date: February 26, 1980
Creator: VanSant, J. H.; Slack, D. S. & Nelson, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geometrical dependence of the low-frequency noise in superconducting flux qubits

Description: Article reporting on a study of a series of 85 devices of vary design using a general method for directly measuring the low-frequency flux noise (below 10 Hz) in compound Josephson-junction superconducting flux qubits. The results support the hypothesis that local impurities in the vicinity of the qubit wiring are a key source of low-frequency flux noise in superconducting devices.
Date: February 26, 2009
Creator: Lanting, T.; Berkley, A. J.; Bumble, B.; Bunyk, P.; Fung, A.; Johansson, J. et al.
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
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