High field performance of superconducting magnets using powder metallurgy processed Cu‐Nb‐Sn and Nb‐Al

High performance Fe-cladded MgB2 taps were prepared by the in situ powder-in-tube method utilizing very cheap stearic acid (C18H36O2) as dopants. The amount of stearic acid was varied from 0 to 30 wt%. We found that a significant enhancement of Jc, Hirr, and Hc2 in comparison with undoped samples was easily achieved. At 4.2 K, the transport Jc for the best doped tapes (10 wt%) reached 2 × 104 A/cm2 at 10 T and 3.7 × 103 A/cm2 at 14 T, respectively, an order of magnitude higher than for the pure tapes. In particular, at 20 K, the irreversibility field of the 10 wt% doped tape was around 10 T, which is comparable to the upper critical field of the commercial NbTi at 4.2 K. The results demonstrate great potential of MgB2 tapes for superconducting magnets.

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High-Field Superconducting Magnets

Advances in Cryogenic Engineering ◽

10.1007/978-1-4757-0528-7_3 ◽

1963 ◽

pp. 17-29 ◽

Cited By ~ 8

Author(s):

J. K. Hulm ◽

B. S. Chandrasekhar ◽

H. Riemersma

Keyword(s):

High Field ◽

Superconducting Magnets

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Influence of Ta and Ti Doping on the High Field Performance of (Nb, Ta, Ti)3Sn Multifilamentary Wires based on Osprey Bronze with High Tin Content

Journal of Physics Conference Series ◽

10.1088/1742-6596/43/1/005 ◽

2006 ◽

Vol 43 ◽

pp. 18-21 ◽

Cited By ~ 1

Author(s):

V Abächerli ◽

D Uglietti ◽

P Lezza ◽

B Seeber ◽

R Flükiger ◽

...

Keyword(s):

High Field ◽

Field Performance ◽

Tin Content ◽

Ti Doping

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A visual and full-field method for detecting quench and normal zone propagation in HTS tapes

Superconductor Science and Technology ◽

10.1088/1361-6668/ac3f9d ◽

2021 ◽

Author(s):

Shudan Wang ◽

Mingzhi Guan ◽

Jiaxiang Chen ◽

Xingzhe Wang ◽

You-He Zhou

Keyword(s):

High Field ◽

Detection Method ◽

Superconducting Magnets ◽

Extreme Environments ◽

Field Method ◽

Image Correlation ◽

Detection Methods ◽

Full Field ◽

Normal Zone ◽

Cryogenic Chamber

Abstract A fast and effective quench detection method is especially challenging in the development of high-field high-temperature superconducting (HTS) magnets for their safe operations and reliably releasing the stored energy during a quench. The occurrence and propagation of a quench are often accompanied by strong thermal and magneto-mechanical responses within superconducting magnets. Aiming to detect a quench in the whole process and capture the thermoelastic behavior associated with it, a new detection technique with a visual and full-field perception based on the digital image correlation (DIC) method is proposed in the present study. The experiment of a quench triggered thermally by a local spot heater is conducted for a YBCO coated conductor tape in a cryogenic chamber. The evolution and characteristics of the full-field strain in the HTS tape during the processes of a non-quench, a quench occurrence and quench propagation are intuitively presented with experimental observations. For the comparison purpose, the conventional quench detection methods by monitoring temperature and voltage signals during a quench are also utilized experimentally. The results verify the visual and full-field quench detection method which uses a criterion of thermoelastic strain-rate for the quench occurrence and the evolution of strain contours for the normal zone propagating aspect. Additionally, a numerical quench model of coupled thermoelasticity to simulate the experiment is established and solved with the aid of Comsol multiphysics software. The quantitative results are in good agreement with the experimental measurements to prove the reliability and availability of the developed detection method. Since the DIC method is non-contact and insensitivity to intense electromagnetic interferences, it is expected to provide a new technique on quench issues and some basic measurements on strain/stress behaviors in extreme environments of high-field HTS magnets in the future.

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Building Laboratory Superconducting Magnets and Present Status of High-Field Magnets

Superconductivity - Springer Series in Materials Science ◽

10.1007/978-3-030-75672-7_9 ◽

2021 ◽

pp. 355-413

Author(s):

R. G. Sharma

Keyword(s):

Present Status ◽

High Field ◽

Superconducting Magnets

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Superconducting Accelerator Magnets Based on High-Temperature Superconducting Bi-2212 Round Wires

Instruments ◽

10.3390/instruments4020017 ◽

2020 ◽

Vol 4 (2) ◽

pp. 17

Author(s):

Tengming Shen ◽

Laura Garcia Fajardo

Keyword(s):

High Temperature ◽

High Field ◽

Scientific Discovery ◽

Superconducting Magnets ◽

Hadron Collider ◽

Development Program ◽

High Energy ◽

Superconducting Transition ◽

High Temperature Superconducting ◽

Superconducting Accelerator

Superconducting magnets are an invaluable tool for scientific discovery, energy research, and medical diagnosis. To date, virtually all superconducting magnets have been made from two Nb-based low-temperature superconductors (Nb-Ti with a superconducting transition temperature Tc of 9.2 K and Nb3Sn with a Tc of 18.3 K). The 8.33 T Nb-Ti accelerator dipole magnets of the large hadron collider (LHC) at CERN enabled the discovery of the Higgs Boson and the ongoing search for physics beyond the standard model of high energy physics. The 12 T class Nb3Sn magnets are key to the International Thermonuclear Experimental Reactor (ITER) Tokamak and to the high-luminosity upgrade of the LHC that aims to increase the luminosity by a factor of 5–10. In this paper, we discuss opportunities with a high-temperature superconducting material Bi-2212 with a Tc of 80–92 K for building more powerful magnets for high energy circular colliders. The development of a superconducting accelerator magnet could not succeed without a parallel development of a high performance conductor. We will review triumphs of developing Bi-2212 round wires into a magnet grade conductor and technologies that enable them. Then, we will discuss the challenges associated with constructing a high-field accelerator magnet using Bi-2212 wires, especially those dipoles of 15–20 T class with a significant value for future physics colliders, potential technology paths forward, and progress made so far with subscale magnet development based on racetrack coils and a canted-cosine-theta magnet design that uniquely addresses the mechanical weaknesses of Bi-2212 cables. Additionally, a roadmap being implemented by the US Magnet Development Program for demonstrating high-field Bi-2212 accelerator dipole technologies is presented.

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