Design of a 10-T superconducting dipole magnet using niobium-tin conductor

Taylor, C.; Meuser, R.; Caspi, S.; Gilbert, W. S.; Hassenzahl, W.V.; Peters, C.; Schäfer, R.; Wolgast, R.

doi:10.1109/tmag.1983.1062261

Cited by 6 publications

(5 citation statements)

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“…LBNL undertook the development of a 10 T dipole based on a Nb 3 Sn conductor (Taylor and Meuser 1981;Taylor et al 1983Taylor et al , 1985. This development was carried out in parallel with the Nb-Ti magnet R&D for the Superconducting Super Collider (SSC).…”

Section: Nb 3 Sn Dipole At Lbnlmentioning

confidence: 99%

“…3.14. The coil consisted of four racetrack windings per pole, each layer having different winding diameters Taylor et al 1983): 1stainless-steel stud; 2brass spacer; 3aluminum clamp; 4stainless-steel bearing plate; 5stainless-steel winding form; 6 -fiberglass epoxy; 7stainless-steel side plate; 8coil; 9stainless-steel end plate and thicknesses, to mimic a shell cos-theta configuration. The coils were not graded and used the same Rutherford cable with a rectangular cross-section.…”

Section: Main Design Conceptmentioning

confidence: 99%

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Nb3Sn Accelerator Magnets: The Early Days (1960s–1980s)

Rossi

Zlobin

2019

Nb3Sn Accelerator Magnets

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Since Nb 3 Sn became available in the form of relatively long tapes in the early 1960s, it was considered for high-field magnets thanks to its high upper critical magnetic field and critical temperature. This chapter is a review of the effort accomplished by the community in the first 25 years of development of Nb 3 Sn accelerator magnets, and an attempt to understand why it took so long before this technology became successful. IntroductionDiscovery and major advancements in the understanding and development of practical type II superconductors in the 1950s and 1960s made it possible to employ them in superconducting magnets, particularly, in accelerator magnets used for steering charged particle beams. The superconducting properties of Nb 3 Sn were discovered in the early 1960s, and soon it was available in form of tapes (or ribbons) produced by the surface diffusion process. Shortly afterwards an alternative concept based on solid-state diffusion was introduced. This principle has been used since the 1970s to fabricate Nb 3 Sn composite wires by the so-called bronze route. In 1974 the internal tin (IT) process was developed, which allowed overcoming the limitation of the bronze method to reach a high critical current density J c due to the limited content of tin in bronze. The availability of IT composite wires eventually proved to be a key asset for high-field Nb 3 Sn magnet research and development (R&D) for accelerators. The year-by-year history of Nb 3 Sn wire development can be found in Foner and Schwartz (1981).

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Section: Nb 3 Sn Dipole At Lbnlmentioning

confidence: 99%

Section: Main Design Conceptmentioning

confidence: 99%

Nb3Sn Accelerator Magnets: The Early Days (1960s–1980s)

Rossi

Zlobin

2019

Nb3Sn Accelerator Magnets

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“…In the early '80's a dipole, developed and tested by CEA Saclay [21], and a quadrupole at CERN [22] drove the technology forward. One of the first attempts to maximize the high field potential of Nb 3 Sn was made at the Lawrence Berkeley National Laboratory (LBNL) where they designed and tested a dipole aimed at achieving 10 T [23][24][25]. This magnet used an improved conductor based on the Internal Tin process with much higher current density than the bronze route conductor.…”

Section: Nb Sn Technologymentioning

confidence: 99%

Superconducting accelerator magnet technology in the 21st century: A new paradigm on the horizon?

Gourlay

2018

Nuclear Instruments and Methods in Physics Research Section A:

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Superconducting magnets for accelerators were first suggested in the mid-60's and have since become one of the major components of modern particle colliders. Technological progress has been slow but steady for the last half-century, based primarily on Nb-Ti superconductor. That technology has reached its peak with the Large Hadron Collider (LHC). Despite the superior electromagnetic properties of Nb 3 Sn and adoption by early magnet pioneers, it is just now coming into use in accelerators though it has not yet reliably achieved fields close to the theoretical limit. The discovery of the High Temperature Superconductors (HTS) in the late '80's created tremendous excitement, but these materials, with tantalizing performance at high fields and temperatures, have not yet been successfully developed into accelerator magnet configurations. Thanks to relatively recent developments in both Bi-2212 and REBCO, and a more focused international effort on magnet development, the situation has changed dramatically. Early optimism has been replaced with a reality that could create a new paradigm in superconducting magnet technology. Using selected examples of magnet technology from the previous century to define the context, this paper will describe the possible innovations using HTS materials as the basis for a new paradigm.

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“…In the 1980s and early 1990s the US Department of Energy (DOE) considered developing magnets using Nb 3 Sn conductor at Lawrence Berkeley National Laboratory (LBNL) (Taylor et al 1983(Taylor et al , 1985. Nb 3 Sn, a brittle, strain-sensitive superconductor, was the only superconductor that at that time had practical current density for fields up to 16 T. It was also well understood that the next high-energy hadron collider would likely require higher operating fields well beyond the present 10 T capabilities of Nb-Ti.…”

Section: Introductionmentioning

confidence: 99%

LBNL Cos-theta Nb3Sn Dipole Magnet D20

Caspi

2019

Nb3Sn Accelerator Magnets

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In 1996 the LBNL D20 Nb 3 Sn dipole magnet reached 12.8 T at 4.4 K and 13.5 T at 1.8 K, and caught the accelerator magnet community by surprise. Not only did it achieve a record field for an accelerator dipole magnet but it also demonstrated a breakthrough in Nb 3 Sn conductor technology. This chapter summarizes the technical aspects of D20 development and test, addresses lessons learned, and includes suggestions relevant to developing high-field magnets for future accelerators.The design approach towards D20 (Dell'Orco et al. 1993a) was "think-outside-thebox," a concept that followed a similar approach previously tried with a unique Nb-Ti magnet (Dell'Orco et al. 1993b). D19, a 50 mm aperture Nb-Ti dipole magnet, was built and tested as a candidate for the US Superconducting Super Collider (SSC) program. With a record field of 7.6 T at 4.4 K and 10 T at 1.9 K, that magnet specifically addressed issues of high fields and Lorentz forces. By separating the traditional concept of using self-supporting collars that combine assembly and pre-stress, D19 used thin non-supporting collars for assembly alone, leaving the functionality of pre-stress to be applied during the final structural assembly. Thin elliptical collars (with a width of 3 mm on the mid-plane) were used for coil assembly and initial alignment. Pre-stress was split between a "rings and collets" loading system and a cool-down shrinkage of aluminum shell over iron. The close proximity of the iron to the coils contributed to the dipole field, and saturation harmonics were handled by the elliptically shaped collars. Aluminum bars between the yokes controlled the final assembly.The successful test of D19, performing without training at 4.4 K, became a model for the D20. The D20 design Scanlan et al. 1995) had a considerable number of additional steps with a complexity that required an integrated design approach. A multi-phased heat treatment, thermal expansion of materials, protection heaters, epoxy impregnation, assembly, and stress pre-loading were mostly still to be understood. This chapter describes the D20 design as it was done in the early 1990s: a time when many presently available tools and programs, especially 3D, were not available or had just started to emerge. Therefore, certain design aspects, routinely used today, were missing and were not implemented in D20. Magnetic Design OptimizationD20 was designed to extend accelerator magnet technology to high fields by using Nb 3 Sn cables with sufficient current density to deliver fields over 13 T. The graded design used two double layers with different wire and cable sizes, placing the larger strand size in the inner layer. The magnetic design underwent three successive iterations:1. Infinite permeability, sector coils, no wedges; 6 LBNL Cos-theta Nb 3 Sn Dipole Magnet D20 135

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Design of a 10-T superconducting dipole magnet using niobium-tin conductor

Cited by 6 publications

References 1 publication

Nb3Sn Accelerator Magnets: The Early Days (1960s–1980s)

Nb3Sn Accelerator Magnets: The Early Days (1960s–1980s)

Superconducting accelerator magnet technology in the 21st century: A new paradigm on the horizon?

LBNL Cos-theta Nb3Sn Dipole Magnet D20

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