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in creator/contributor: "Higley, H."

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Conductor Development for High Field Dipole Magnets

Historically, improvements in dipole magnet performance have been paced by improvements in the superconductor available for use in these magnets. The critical conductor performance parameters for dipole magnets include current density, piece length, effective filament size, and cost. Each of these parameters is important for efficient, cost effective dipoles, with critical current density being perhaps the most important. Several promising magnet designs for the next hadron collider or a muon c… more

Date: March 1, 2000

Creator: Scanlan, R. M.; Dietderich, D. R. & Higley, H. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Characterizations of a CERN NbTi Reference Wire at LBNL

We report on the measurement of two NbTi reference samples,obtained from CERN through BNL, wire number02R00056A01UX.265. The purposeof these characterizations is two-fold: 1) To establish aninter-laboratory comparisonof short sample tests and analysis betweenLBNL, BNL and Fermilab within the LARP collaboration. Due to differencesin reaction and mounting procedures and their resulting straindifferences, Nb3Sn is not suited for this purpose. 2) To determine theaccuracy of LBNL's system with regar… more

Date: February 1, 2007

Creator: Godeke, A.; Dietderich, D.R.; Higley, H.C. & Liggins, N.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Manufacturing experience for the LHC inner triplet quadrupole cables

The design for the U.S. LHC Inner Triplet Quadrupole magnet requires a 37 strand (inner layer) and a 46 strand (outer layer) cable. This represents the largest number of strands attempted to date for a production quantity of Rutherford-type cable. The cable parameters were optimized during the production of a series of short prototype magnets produced at FNAL. These optimization studies focused on critical current degradation, dimensional control, coil winding, and interstrand resistance. After… more

Date: June 12, 2001

Creator: Scanlan, R. M.; Higley, H. C.; Bossert, R.; Kerby, J.; Gosh, A. K.; Boivin, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fabrication and Test Results for Rutherford-Type Cables Made from BSCCO Strands

Wires based on the Bi-2212 HTS superconductor are becoming available commercially, with current densities that are attractive for some applications. We report here on our success in using these Bi-2212 wires to fabricate multistrand, kiloamp conductors that can be used to construct dipole and quadrupole magnets for particle accelerator applications. Multistrand cables have been made from several types of Bi-2212 wire supplied by two manufacturers. These cables were made with cores of various co… more

Date: September 1, 1998

Creator: Scanlan, R. M.; Dietderich, D. R.; Higley, H. C.; Marken, K. R.; Motowidlo, L. R.; Solokowski, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Conceptual design of a common coil dipole for VLHC

Superconducting magnet technology and cost reduction are key issues in the R and D effort towards a post-LHC, 100 TeV hadron collider. A dipole field of 10-12 T at 4.5 K operating temperature results in acceptable machine length and refrigeration power requirements, and allows taking advantage of synchrotron radiation damping to achieve low beam emittance. In this paper, the conceptual design of a react-and-wind common coil dipole is presented, which aims at these operating parameters with mini… more

Date: November 22, 1999

Creator: Sabbi, G.; Ambrosio, G.; Andreev, N.; Barzi, E.; Ewald, K.; Limon, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and Fabrication of a High Aspect Ratio Cable for a High Gradie nt Quadrupole Magnet

The Large Hadron Collider interaction regions require quadrupoles with a 70 mm diameter bore, a gradient of 250 T/m, and good cooling so that the magnets can operate in a high radiation background without quenching. In order to meet these stringent requirements, a two-layer magnet with a high aspect ratio cable has been designed. This cable ulilizes the SSC inner and outer layer strands, which have been optimized and are available in large quantities. The initial design parameters for both cabl… more

Date: December 12, 1996

Creator: Scanlan, R. M.; McInturff, A. D.; Taylor, C. E.; Caspi, S.; Dell'Orco, D.; Higley, H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Developmentof the 15 T Nb3Sn dipole HD2

The Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is continuing the development of HD2, a 1 m long Nb{sub 3}Sn dipole generating a dipole field of 15 T in a 36 mm clear bore. With tilted (flared) ends to avoid obstructing the beam path, HD2 represents a step towards the development of cost effective accelerator quality magnets. The design has been optimized to minimize geometric harmonics and to address iron saturation and conductor magnetization effects. The su… more

Date: June 1, 2008

Creator: Caspi, S.; Cheng, D. W.; Dietderich, D. R.; Hafalia, A. R.; Hannaford, C. R.; Higley, H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operational Characteristics, parameters, and history of a 13T Nb3Sn dipole

The early design and test results have been previously reported. During the subsequent operation of 'D20' the accelerator prototype dipole has provided both additional and more detailed data as to its characteristics and performance. D20's use as a test facility for high field critical current measurements has provided operational experience and history pertammg to accelerator required characteristics. There has been recently obtained data related to field quality, operational reproducibility a… more

Date: March 18, 1999

Creator: Benjegerdes, R.; Bish, P.; Caspi, S.; Chow, K.; Dietderich, D.; Hannaford, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Correlation Between Strand Stability and Magnet Performance

Magnet programs at BNL, LBNL and FNAL have observed instabilities in high J{sub c} Nb{sub 3}Sn strands and magnets made from these strands. This paper correlates the strand stability determined from a short sample-strand test to the observed magnet performance. It has been observed that strands that carry high currents at high fields (greater than 10 T) cannot sustain these same currents at low fields (1-3 T) when the sample current is fixed and the magnetic field is ramped. This suggests that … more

Date: June 1, 2005

Creator: Dietderich, D. R.; Bartlett, S. E.; Caspi, S.; Ferracin, P.; Gourlay, S. A.; Higley, H. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fabrication and testing of Rutherford-type cables for react and wind accelerator magnets

A common coil design for a high-field accelerator dipole magnet using a Nb{sub 3}Sn cable with the React-and-Wind approach is pursued by a collaboration between Fermilab and LBNL. The design requirements for the cable include a high operating current so that a field of 10-11 T can be produced, together with a low critical current degradation due to bending around a 90 mm radius. A program, using ITER strands of the internal tin type, was launched to develop the optimal cable design for React-an… more

Date: September 11, 2000

Creator: Bauer, P.; Ambrosio, G.; Andreev, N.; Barzi, E.; Dietderich, D.; Ewald, K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design and Fabrication of a 14 T, Nb3Sn Superconducting Racetrack Dipole Magnet

Most accelerator magnets for applications in the field range up to 10 T utilize NbTi superconductor and a cosine theta coil design. For fields above 10 T, it is necessary to use Nb{sub 3}Sn or other strain sensitive superconductors land other coil geometries that are more compatible with these materials. This paper describes our recent efforts to design a series of racetrack coil magnets that will provide experimental verification of an alternative magnet design philosophy, with the near-term g… more

Date: September 1, 1999

Creator: Gourlay, S. A.; Bish, P.; Caspi, S.; Chow, K.; Dietderich, D. R.; Gupta, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Test Results of HD1b, an upgraded 16 Tesla Nb3Sn Dipole Magnet

The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing high-field, brittle-superconductor, accelerator magnet technology, in which the conductor's support system can significantly impact conductor performance (as well as magnet training). A recent H-dipole coil test (HD1) achieved a peak bore-field of 16 Tesla, using two, flat-racetrack, double-layer Nb{sub 3}Sn coils. However, its 4.5 K training was slow, with an erratic plateau at {approx}92% of its un-d… more

Date: April 16, 2005

Creator: Lietzke, A. F.; Bartlett, S. E.; Bish, P.; Caspi, S.; Dietderich, D.; Ferracin, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fabrication and test results of a high field, Nb3Sn superconducting racetrack dipole magnet

The LBNL Superconducting Magnet Program is extending accelerator magnet technology to the highest possible fields. A 1 meter long, racetrack dipole magnet, utilizing state-of-the-art Nb{sub 3}Sn superconductor, has been built and tested. A record dipole filed of 14.7 Tesla has been achieved. Relevant features of the final assembly and tested results are discussed.

Date: June 15, 2001

Creator: Benjegerdes, R.; Bish, P.; Byford, D.; Caspi, S.; Dietderich, D.R.; Gourlay, S.A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Structure for an LHC 90mm Nb3Sn Quadrupole Magnet

A full-scale mechanical model of the LHC Nb{sub 3}Sn quadrupole magnet structure has been designed, built and tested. The structure will support a 90mm bore, 1m long magnet prototype as part of the US LHC Accelerator Research Program (LARP). The structure utilizes Bladder and Key Technology to control and transfer pre-stress from an outer aluminum shell to an inner coil. Axial aluminum rods take care of pre-stress at the ends--ensuring that the coil is fully constrained along all three axes. Th… more

Date: April 16, 2005

Creator: Hafalia, A. R.; Caspi, S.; Bartlett, S. E.; Dietderich, D. R.; Ferracin, P.; Gourlay, S. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Test Results for HD1, a 16 Tesla Nb3Sn Dipole Magnet

The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing the technology for using brittle superconductor in high-field accelerator magnets. HD1, the latest in a series of magnets, contains two, double-layer Nb{sub 3}Sn flat racetrack coils. This single-bore dipole configuration, using the highest performance conductor available, was designed and assembled for a 16 tesla conductor/structure/pre-stress proof-of-principle. With the combination of brittle conduc… more

Date: October 1, 2003

Creator: Lietzke, A.F.; Bartlett, S.; Bish, P.; Caspi, S.; Chiesa, L.; Dietderich, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

HD1: Design and Fabrication of a 16 Tesla Nb3Sn Dipole Magnet

The Lawrence Berkeley National Laboratory (LBNL) Supcrconducting Magnet Group has completed the design, fabrication and tcst of HD1, a 16 T block-coil dipole magnet. State of the art Nb{sub 3}Sn conductor was wound in double-layer racetrack coils and supported by an iron yoke and a tensioned aluminum shell. In order to prevent conductor movement under magnetic forces up to the design field, a coil prestress of 150 MPa was required. To achieve this level without damaging the brittle conductor, t… more

Date: October 1, 2003

Creator: Hafalia, A. R.; Barlett, S. E.; Caspi, S.; Chiesa, L.; Dietderich, D. R.; Ferracin, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department