Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi2Sr2CaCu2Ox multifilament round wires

Ye, Liyang; Li, Pei; Jaroszynski, Jan; Schwartz, Justin; Shen, Tengming

doi:10.1088/0953-2048/30/2/025005

Title: Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi₂Sr₂CaCu₂O_x multifilament round wires

Abstract

The critical current of many practical superconductors is sensitive to strain, and this sensitivity is exacerbated during a quench that induces a peak local strain which can be fatal to superconducting magnets. Here, a new method is introduced to quantify the influence of the conductor stress and strain state during normal operation on the margin to degradation during a quench, as measured by the maximum allowable hot spot temperature T_allowable, for composite wires within superconducting magnets. The first conductor examined is Ag-sheathed Bi₂Sr₂CaCu₂O_x round wire carrying high engineering critical current density, J_E, of 550 A mm^-2 at 4.2 K and 15 T. The critical axial tensile stress of this conductor is determined to be 150 MPa and, in the absence of Lorentz forces, T_allowable is greater than 450 K. With increasing axial tensile stress, σ_a, however, T_allowable decreases nonlinearly, dropping to 280 K for σ_a = 120 MPa and to 160 K for σ_a = 145 MPa. T_allowable(σ_a) is shown to be nonlinear and independent of magnetic field from 15 to 30 T. T_allowable(σ_a) dictates the balance between magnetic field generation, which increases with the magnet operating current and stress, and the safety margin, which decreases with decreasing T_allowable, andmore »« less

Authors:

Ye, Liyang ^[1]; Li, Pei ^[2]; Jaroszynski, Jan ^[3]; Schwartz, Justin ^[4]; Shen, Tengming ^[5]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:: Thu Dec 01 00:00:00 EST 2016

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

OSTI Identifier:: 1423259

Alternate Identifier(s):: OSTI ID: 1334196; OSTI ID: 1574317

Report Number(s):: FERMILAB-PUB-17-642-TD
Journal ID: ISSN 0953-2048; 1512387; TRN: US1801726

Grant/Contract Number:: AC02-07CH11359; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Superconductor Science and Technology

Additional Journal Information:: Journal Volume: 30; Journal Issue: 2; Journal ID: ISSN 0953-2048

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconducting magnet; quench protection; Bi-2212

Citation Formats


                    Ye, Liyang, Li, Pei, Jaroszynski, Jan, Schwartz, Justin, and Shen, Tengming. Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi2Sr2CaCu2Ox multifilament round wires.  United States: N. p., 2016. 
Web.  doi:10.1088/0953-2048/30/2/025005.

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                    Ye, Liyang, Li, Pei, Jaroszynski, Jan, Schwartz, Justin, & Shen, Tengming. Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi2Sr2CaCu2Ox multifilament round wires.  United States.  https://doi.org/10.1088/0953-2048/30/2/025005

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                    Ye, Liyang, Li, Pei, Jaroszynski, Jan, Schwartz, Justin, and Shen, Tengming. Thu .  
"Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi2Sr2CaCu2Ox multifilament round wires".  United States.  https://doi.org/10.1088/0953-2048/30/2/025005.  https://www.osti.gov/servlets/purl/1423259.

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@article{osti_1423259,

  title        = {Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi2Sr2CaCu2Ox multifilament round wires},

  author       = {Ye, Liyang and Li, Pei and Jaroszynski, Jan and Schwartz, Justin and Shen, Tengming},

  abstractNote = {The critical current of many practical superconductors is sensitive to strain, and this sensitivity is exacerbated during a quench that induces a peak local strain which can be fatal to superconducting magnets. Here, a new method is introduced to quantify the influence of the conductor stress and strain state during normal operation on the margin to degradation during a quench, as measured by the maximum allowable hot spot temperature Tallowable, for composite wires within superconducting magnets. The first conductor examined is Ag-sheathed Bi2Sr2CaCu2Ox round wire carrying high engineering critical current density, JE, of 550 A mm-2 at 4.2 K and 15 T. The critical axial tensile stress of this conductor is determined to be 150 MPa and, in the absence of Lorentz forces, Tallowable is greater than 450 K. With increasing axial tensile stress, σa, however, Tallowable decreases nonlinearly, dropping to 280 K for σa = 120 MPa and to 160 K for σa = 145 MPa. Tallowable(σa) is shown to be nonlinear and independent of magnetic field from 15 to 30 T. Tallowable(σa) dictates the balance between magnetic field generation, which increases with the magnet operating current and stress, and the safety margin, which decreases with decreasing Tallowable, and therefore has important engineering value. It is also shown that Tallowable(σa) can be predicted accurately by a general strain model, showing that strain control is the key to preventing degradation of superconductors during a quench.},

  doi          = {10.1088/0953-2048/30/2/025005},

  journal      = {Superconductor Science and Technology},

  number       = 2,

  volume       = 30,

  place        = {United States},

  year         = {Thu Dec 01 00:00:00 EST 2016},

  month        = {Thu Dec 01 00:00:00 EST 2016}

}

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Title: Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi2Sr2CaCu2Ox multifilament round wires

Abstract

Citation Formats

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Title: Strain control of composite superconductors to prevent degradation of superconducting magnets due to a quench: I. Ag/Bi₂Sr₂CaCu₂O_x multifilament round wires

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