Generation of 23.4 T using two Bi-2212 insert coils

Toko, Kiyoshi; Kosuge, M.; Yuyama, M.; Nagai, Hideo; Wada, Hitoshi; Kitaguchi, Hitoshi; Okada, Minoru; Tanaka, Kazuhide; Wakuda, T.; Ohata, K.; Sato, Jun

doi:10.1109/77.828274

Cited by 41 publications

(19 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the finite thermal energy of the magnetic flux-line lattice, all three materials have H* 10-15% below H c2 . Nb47Ti magnets can thus reach ~9 T at 4.2 K while Nb 3 Sn magnets can reach 20 to 22 T at 4.2 K. In principle, HTS and Chevrel-phase conductors can reach still higher fields; for example, Bi-2212 conductors were recently used to make fields up to 23 T [1]. However, HTS conductors are limited by their anisotropy, and both HTS and Chevrel-phase conductors have processing difficulties.…”

Section: Constraints On Use Of Superconductors For Magnetsmentioning

confidence: 99%

Potential application of magnesium diboride for accelerator magnet applications

Cooley

Eom²,

Hellstrom³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

View full text Add to dashboard Cite

This paper reviews the potential of the newly discovered and unexpected 39 K superconductor MgB 2 as a material for accelerator magnet strands. Unlike the high temperature cuprate superconductors, intergranular current flow in MgB 2 is not obstructed by weak links, removing one serious obstacle to the fabrication of wires. The critical current density J c exceeds 10 5 A/cm 2 in 1 T field at 4.2 K and in self-field at 20 K. However, the compound is anisotropic and the perpendicular upper critical field H c2^ in present bulk samples is comparable to or less than that in Nb47wt.%Ti at 4.2 K. Thin films have shown significantly higher J c and H c2 . Magnetization J c values at 4.2 K exceed 10 6 A/cm 2 in many reports, and approach 10 7 A/cm 2 for films with T c close to 39 K. In alloyed films with small grain size and high resistivity, the irreversibility field H* (~0.85H c2 ) is 16 T at 4.2 K in perpendicular field (and double that in parallel field), and J c exceeds 10 5 A/cm 2 up to 10 T at 4.2 K and 5 T at 20 K. Simple wires, which achieve the properties of sintered bulk samples, are being made by the powder-in-tube route, indicating potential application capability, particularly if alloyed MgB 2 wires replicating thin film properties can be made.

show abstract

Section: Constraints On Use Of Superconductors For Magnetsmentioning

confidence: 99%

Potential application of magnesium diboride for accelerator magnet applications

Cooley

Eom²,

Hellstrom³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

View full text Add to dashboard Cite

show abstract

“…2 (right). Because the cost is not a constraint in the minimum volume design, a fraction of the current density is shuffled from the inner HTS section to the outer Nb 3 Sn section that result in more expensive, but smaller magnet. Consequently increases the field contribution of the outer section and thus larger volume gets filled with higher magnetic field, leading to increased stored energy.…”

Section: ) Minimum Volume Criterionmentioning

confidence: 99%

Study of High Field Superconducting Solenoids for Muon Beam Cooling

Kashikhin

Barzi

Kashikhin

et al. 2008

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-The final beam cooling stages of a possible MuonCollider may require DC solenoid magnets with magnetic fields of 40-50 T in an aperture of 40-50 mm. In this paper we study possible solutions towards creating DC fields of that order using available superconductors. Several magnetic and mechanical designs, optimized for the maximum performance are presented and compared in terms of cost and size.

show abstract

“…Slight degradation of the coil performance is observed due to thermal cycling after operation at 2 K [44]. Another Hitachi-developed HTS insert reminiscent of their 1996 coil is operated in this 21.1 T background field creating a field increment of almost 2 T for a record central field of 23.42 T [43,14].…”

Section: Brief History Of Insert Coilsmentioning

confidence: 99%

“…The Japanese national magnet lab, now part of NIMS 14 , embarked on a program towards a 23.5 T LTS/HTS NMR magnet, in collaboration with industry. Several small coils were tested in the 21.1 T, 50-mm bore superconducting magnet of the Tsukuba Magnet Lab [36].…”

Section: Brief History Of Insert Coilsmentioning

confidence: 99%

See 1 more Smart Citation

High-temperature superconductors in high-field magnets

Weijers

View full text Add to dashboard Cite

Preface and acknowledgementThis thesis deals with selected topics out of a wide research and development effort on HTS insert coil technology. Its origin goes back to the founding charter of the NHMFL in the year 1988 which listed the goal of realizing a 25 T superconducting magnet as one of the milestones the NHMFL was to achieve. High-temperature superconductors had only just been discovered and the required technology was non-existent. The path to where we are now has been eventful and a real learning experience. From the early days in the mid-1990-ies of the 'Wind and Pray" approach when coil testing relentlessly pointed out the shortcomings of both conductor and coil technologies at the time to the first successful "mini-coils" (around coil number 70) to the successive 1 T, 3 T and 5 T inserts (the latter reaching 25 T and bringing the total of numbered coils over 300 a decade later) to the promise of 30 + T superconducting user magnets with coated conductors in the not-toodistant future.Lacking the funds to buy the very expensive conductors, a collaboration was established with industry. This approach has served us well and resulted in a wide assortment of conductors to work with. New superconductors were donated in exchange for feedback on its performance as observed in our magnet technology development program. We also tested complete coils built by ourselves or by partners, in background magnetic field, a task for which the NHMFL facilities are well suited.This work is centered on the 5T insert coil for a total magnetic field of 25 T, but the research and development effort is interwoven with and inseparable from the broader HTS insert coil technology development program. Therefore discussions on a wider range of conductors and coils in line with the broader scope of this thesis are presented.While I take full responsibility for the described NHMFL insert coil designs, analysis and interpretation of the data on coils and conductors, having executed or been directly involved with all experiments described and having wound many a coil, this work has had the benefit of many direct and indirect contributions of a large number of people inside and outside the NHMFL. In contrast, developing this thesis itself has been the loneliest work I have ever done, but ultimately just as rewarding. There are many people that I would like to thank for their contributions to the HTS insert program in general and this thesis in particular.

show abstract

Generation of 23.4 T using two Bi-2212 insert coils

Cited by 41 publications

References 9 publications

Potential application of magnesium diboride for accelerator magnet applications

Potential application of magnesium diboride for accelerator magnet applications

Study of High Field Superconducting Solenoids for Muon Beam Cooling

High-temperature superconductors in high-field magnets

Contact Info

Product

Resources

About