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in subjects: "Superconducting Coils"

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TPX superconducting Tokamak magnet system: 1995 design and status overview

The TPX magnet preliminary design effort is summarized. Key results and accomplishments during preliminary design and supporting R and D are discussed, including conductor development, quench detection, TF and PF magnet design, conductor bending and forming, reaction heat treating, helium stubs, and winding pack insulation.

Date: September 29, 1995

Creator: Deis, G.; Bulmer, R. & Carpenter, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Concept for a third generation ECR source at LBL

Although the Advanced Electron Cyclotron Resonance ion source has produced record high charge state beams and is now in operation with the 88-Inch Cyclotron, development of a third generation ECR source could provide major new research opportunities at the 88-Inch Cyclotron. Higher intensities for particles with mass greater than 150 and energies above the Coulomb barrier would improve experiments using deep inelastic reactions to produce neutron rich compound nuclei that can be studied with th… more

Date: April 1, 1995

Creator: Lyneis, C. M. & Xie, Z. Q.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Summary results of an assessment of research projects in the superconductivity for electric power systems program

The Office of Program Analysis undertook an assessment of 37 research projects sponsored by the High Temperature Superconductivity Program. This report summarizes the results of the review. Rating factors included scientific and technical merit, mission relevance, appropriateness and level of innovation, quality of project team, productivity, and probable impact on the program`s mission. Some research needs and opportunities are described that were identified by the reviewers in the areas of wi… more

Date: October 1, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Performance evaluation of high-temperature superconducting current leads for micro-SMES systems

As part of the US Department of Energy`s Superconductivity Technology Program, Argonne National Laboratory and Superconductivity, Inc., are developing high-temperature superconductor (HTS) current leads for application to micro-superconducting magnetic energy storage systems. Two 1500-A HTS leads have been designed and constructed. The performance of the current lead assemblies is being evaluated in a zero-magnetic-field test program that includes assembly procedures, tooling, and quality assur… more

Date: August 1, 1995

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J. R.; Buckles, W. E.; Weber, B. R. & Yang, S. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Spontaneous quenches of a high temperature superconducting pancake coil

A double-pancake coil made of Bi-2223/Ag high temperature superconducting (HTS) tape was constructed with an embedded heater and graded conductors to study the stability and quench propagation in HTS coils. The experiments were performed with liquid nitrogen and gaseous helium cooling in temperatures ranging from 5 to 77 K. The coil was very stable, and no ``normal`` zone was sustained or propagated with local pulsed heating. However, spontaneous quenches of the cod were experienced. This was f… more

Date: September 1, 1995

Creator: Lue, J.W.; Lubell, M.S.; Aized, D.; Campbell, J.M. & Schwall, R.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The cryogenic helium cooling system for the Tokamak physics experiment

The Tokamak Physics Experiment (TPX) will use supercritical helium to cool all the magnets and supply helium to the Vacuum cryopumping subsystem. The heat loads will come from the standard steady state conduction and thermal radiation sources and from the pulsed loads of the nuclear and eddy currents caused by the Central Solenoid Coils and the plasma positioning coils. The operations of the TPX will begin with pulses of up to 1000 seconds in duration every 75 minutes. The helium system utilize… more

Date: September 29, 1995

Creator: Felker, Brian; Slack, Donald S. & Wendland, Craig R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

TPX: Contractor preliminary design review. Volume 1, Presentation and design description. Final report

This first volume of the five volume set begins with a CPDR overview and then details the PF magnet system, manufacturing R&D, Westinghouse R&D, the central solenoid, the PF 5 ring coil, the PF 6/7 ring coil, quality assurance, and the system design description.

Date: September 22, 1995

Creator: Hartman, D.; Naumovich, G.; Walstrom, P.; Clarkson, I.; Schultheiss, J. & Burger, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Tokamak Physics EXperiment (TPX): Toroidal field magnet design, development and manufacture. SDRL 15, System design description. Volume 1

This System Design Description, prepared in accordance with the TPX Project Management Plan provides a summary or TF Magnet System design features at the conclusion of Phase I, Preliminary Design and Manufacturing Research. The document includes the analytical and experimental bases for the design, and plans for implementation in final design, manufacturing, test, and magnet integration into the tokamak. Requirements for operation and maintenance are outlined, and references to sources of addit… more

Date: September 22, 1995

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Tokamak Physics EXperiment (TPX): Toroidal field magnet design, development and manufacture. SDRL 32, Coil assembly documentation. Volume 5

This document is intended to address the contract requirement for providing coil assembly documentation, as required in the applicable Statement of Work: `Provide preliminary procedures and preliminary design and supporting analysis of the equipment, fixtures, and hardware required to integrate and align the impregnated coil assemblies with the coil cases and intercoil structure. Each of the three major processes associated with the coil case and intercoil structure (ICS), TF Case Fabrication, … more

Date: August 18, 1995

Creator: Weber, C.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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TPX: Contractor preliminary design review. Volume 5, Manufacturing R&D

TPX Insulation & Impregnation R&D test results are reported for 1x2 samples designed for screening candidate conduit insulation systems for TPX PF and TF coils. The epoxy/glass insulation system and three proposed alternate insulation systems employing Kapton, was evaluated in as received sample condition and after 10 thermal cycles in liquid nitrogen. Two DGBA impregnation systems, Shell 826 and CTD101K were investigated. Square incoloy 908 and 316 LN stainless hollow conduits were used for 1x… more

Date: August 4, 1995

Creator: Roach, J. F.; Urban, W. M. & Hartman, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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TPX: Contractor preliminary design review. Volume 3, Design and analysis

Several models have been formed for investigating the maximum electromagnetic loading and magnetic field levels associated with the Tokamak Physics eXperiment (TPX) superconducting Poloidal Field (PF) coils. The analyses have been performed to support the design of the individual fourteen hoop coils forming the PF system. The coils have been sub-divided into three coil systems consisting of the central solenoid (CS), PF5 coils, and the larger radius PF6 and PF7 coils. Various electromagnetic an… more

Date: June 30, 1995

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Tokamak Physics EXperiment (TPX): Toroidal field magnet design, development and manufacture. SDRL 46, CPDR review package. Volume 6

This preliminary design reviews the overall design package for the magnet system. It is mostly presented in viewgraphs. The lengthy presentation took up two full days. Sections are given on TF SDD, TF magnet specifications, TF interface definition, drawing tree and design control, winding pack design, manufacturing, coil setup for VPI, TPX TF magnet assembly, TF materials and processes, quality assurance and test requirements, coil verification testing, TPX acceptance tools, and planning tools.

Date: August 18, 1995

Creator: Weber, C. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Report on discussions with utility engineers about superconducting generators

This report relates to a series of discussions with electric utility engineers concerning the integration of high-temperature superconducting (HTS) generators into the present electric power system. The current and future interest of the utilities in the purchase and use of HTS generators is assessed. Various performance and economic factors are also considered as part of this inspection of the utility prospects for HTS generators. Integration of HTS generators into the electric utility sector … more

Date: March 1, 1996

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Coil end design for the LHC dipole magnet

This paper describes the design of the coil ends for the Large Hadron Collider dipole magnets of the CERN European Laboratory for Particle Physics in Switzerland. This alternative to existing European designs was provided by Fermi National Accelerator Laboratory by agreement between CERN and the United States. The superconducting cable paths are determined from both magnetic and mechanical considerations. The coil end parts used to shape and constrain the conductors in the coil ends are designe… more

Date: May 21, 1996

Creator: Brandt, J.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Bootstrap current in enhanced reversed shear tokamaks for volume neutron source applications

The bootstrap current is evaluated for two reference tokamak designs for a Volume Neutron Source (VNS). One is a larger aspect ratio design using superconducting coils (VNS-SC) and the other is a small aspect ratio design using a solid core with normal conducting toroidal field coils (VNS-ST). The target plasma profiles are taken as representative of the recently observed enhanced reverse shear plasmas with hollow magnetic safety factor (q) profiles in the core and corresponding peaked density … more

Date: December 31, 1995

Creator: Houlberg, W.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tokamak Physics EXperiment (TPX): Toroidal magnet design, development and manufacture. SDRL 31, Magnet sensors. Volume 4

The requirement for magnet sensors to verify the TF magnet system operation and aid in diagnostic assessment are defined. However, generally one does not specify such a system in the absence of a definition of the local I&C system. Also, one would expect that there would be great benefit (economy, redundancy, compatibility, etc.) in specifying common components for all of the magnet system. Thus specifying the sensors requirement we have tried to be flexible to accommodate future adjustments to… more

Date: August 18, 1995

Creator: Weber, C. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The CMS central hadron calorimeter

The CMS central hadron calorimeter is a copper absorber/ scintillator sampling structure. We describe design choices that led us to this concept, details of the mechanical and optical structure, and test beam results. We discuss calibration techniques, and finally the anticipated construction schedule.

Date: December 31, 1996

Creator: Freeman, J. & Collaboration, E892

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The conducting shell stellarator: A simple means for producing complicated fields

One of the main characteristics of stellarators, both helical and modular, is that their coil sets must take difficult shapes in order to produce the complicated stellarator magnetic fields. The complex coil shapes make fabrication difficult and costly compared to say the toroidal field, TF, coil set of a tokamak. The conducting shell stellarator, CSS, configuration described in this report shows that complicated stellarator fields can be produced by inducing eddy currents in a conducting shell… more

Date: January 1, 1997

Creator: Sheffield, G.V.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Magnetic fusion commercial power plants

Toroidal magnetic systems present the best opportunity to make a commercial fusion power plant. They offer potential solutions to the main requirements that confront a power plant designer. An ideal system may be postulated in which the coils are a very small part of the cost, and the cost stems primarily from the inescapable components: minimal plasma heating (and sustaining system), tritium breeding blanket, shield, particle input, removal and treatment system, heat transfer system, generator… more

Date: December 31, 1994

Creator: Sheffield, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Processing and properties of long-lengths of Ag-clad BSCCO superconductors and high-{Tc} magnets

Long lengths of Ag-clad mono and multicore BSCCO tapes were fabricated by the powder-in-tube technique. The critical current density (J{sub c}) of 125-m-long monocore tapes was {approx}12,000 A/cm{sup 2} (critical current, I{sub c} 20 A) at 77 K. A 230-m-long 37-filament tape carried an I{sub c} of 14 A (corresponding to a J{sub c} of {approx}10,000 A/cm{sup 2}). Pancake-shaped coils were formed from long-length conductors by the wind-and-react approach. High-T{sub c} magnets were then assemble… more

Date: October 1, 1994

Creator: Balachandran, U.; Iyer, A.N.; Jammy, R.; Haldar, P.; Hoehn, J.G. Jr. & Suenaga, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Performance of coils wound from long lengths of surface-coated, reacted, BSCCO-2212 conductor

React-before-wind surface-coated BSCCO-2212 is being established as a relatively low cost HTS conductor for practical applications. Quality tape is presently being manufactured in 450-500m lengths at a cost estimated to be 1/3-1/5 of the industry costs of BSCCO-2223 powder-in-tube tape. Robust, mechanically sound coils for applications ranging from NMR insert magnets to transformer windings are being made from this BSCCO-2212 tape. The coils have performed consistently through test and thermal … more

Date: October 1996

Creator: Walker, M. S.; Hazelton, D. W. & Gardner, M. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

30 MJ superconducting magnetic energy storage stabilizing coil. Final report for construction

This report covers Phase II, Fabrication and Delivery of the 30 MJ Superconducting Magnetic Energy Storage Stabilizing Coil. A history of the manufacturing and assembly phase of the magnet is presented. Major problems and solutions are summarized, and illustrations of the major operations are provided. The Quality Assurance program is described with a listing of all nonconformance reports. Design documentation is provided, including a Design Document Index, monthly progress reports, and a list … more

Date: March 1, 1983

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The art and science of magnet design: A Festschrift in honor of Klaus Halbach. Volume 1

This is a collection of technical papers and personal remembrances written expressly for the Halbach Symposium and dedicated to Klaus Halbach. The topics presented offer a hint of the diversity of Klaus`s scientific career. Most of the papers deal with magnets for accelerators and accelerator facilities. Other topics covered are free electron lasers, Halbach array motor/generators, radiation and gas conduction heat transport across a dewar multilayer insulation system, and surface structural de… more

Date: February 1, 1995

Creator: Cross, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The crystallography of fatigue crack initiation in Incoloy-908 and A-286 steel

Fatigue crack initiation in the austenitic Fe-Ni superalloys Incoloy-908 and A-286 is examined using local crystallographic orientation measurements. Results are consistent with sharp transgranular initiation and propagation occurring almost exclusively on {l_brace}111{r_brace} planes in Incoloy-908 but on a variety of low index planes in A-286. This difference is attributed to the influence of the semicoherent grain boundary {eta} phase in A-286. Initiation in each alloy occurred both intergra… more

Date: December 1, 1996

Creator: Krenn, C.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department