Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets

Cooley, L. D.; Ghosh, A. K.; Dietderich, D. R.; Pong, I.

doi:10.1109/TASC.2017.2648738

Title: Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets

Abstract

© 2017 IEEE. The high-luminosity upgrade of the large hadron collider (HL-LHC) at CERN will replace the main ring inner triplet quadrupoles, identified by the acronym MQXF, adjacent to the main ring intersection regions. For the past decade, the U.S. LHC Accelerator R&D Program, LARP, has been evaluating conductors for the MQXFA prototypes, which are the outer magnets of the triplet. Recently, the requirements for MQXF magnets and cables have been published in [P. Ferracin et al., IEEE Trans. Appl. Supercond., vol. 26, no. 4, Jun. 2016, Art. no. 4000207], along with the final specification for Ti-alloyed Nb3Sn conductor determined jointly by CERN and LARP. This paper describes the rationale beneath the 0.85-mm-diameter strand's chief parameters, which are 108 or more subelements, a copper fraction not less than 52.4%, strand critical current at 4.22 K not less than 631 A at 12 T and 331 A at 15 T, and residual resistance ratio of not less than 150. This paper also compares the performance for ~100 km production lots of the five most recent LARP conductors to the first 163 km of strand made according to theHL-LHCspecification.Two factors emerge as significant for optimizing performance and minimizing risk: a modest increasemore »« less

Authors:: Cooley, L. D.; Ghosh, A. K.; Dietderich, D. R.; Pong, I.

Publication Date:: 2017-06-01

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

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

Contributing Org.:: LARP

OSTI Identifier:: 1340492

Alternate Identifier(s):: OSTI ID: 1340481; OSTI ID: 1580090

Report Number(s):: FERMILAB-CONF-16-344-TD
Journal ID: ISSN 1051-8223; 1510202; TRN: US1700515

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

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 27; Journal Issue: 4; Journal ID: ISSN 1051-8223

Publisher:: Institute of Electrical and Electronics Engineers (IEEE)

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; RRR; critical current; magnet conductors; Nb3Sn; niobium tin superconductors; quadrupole magnets; residual resistance ratio

Citation Formats


                    Cooley, L. D., Ghosh, A. K., Dietderich, D. R., and Pong, I. Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets.  United States: N. p., 2017. 
Web.  doi:10.1109/TASC.2017.2648738.

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                    Cooley, L. D., Ghosh, A. K., Dietderich, D. R., & Pong, I. Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets.  United States.  https://doi.org/10.1109/TASC.2017.2648738

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                    Cooley, L. D., Ghosh, A. K., Dietderich, D. R., and Pong, I. Thu .  
"Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets".  United States.  https://doi.org/10.1109/TASC.2017.2648738.  https://www.osti.gov/servlets/purl/1340492.

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@article{osti_1340492,

  title        = {Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets},

  author       = {Cooley, L. D. and Ghosh, A. K. and Dietderich, D. R. and Pong, I.},

  abstractNote = {© 2017 IEEE. The high-luminosity upgrade of the large hadron collider (HL-LHC) at CERN will replace the main ring inner triplet quadrupoles, identified by the acronym MQXF, adjacent to the main ring intersection regions. For the past decade, the U.S. LHC Accelerator R&D Program, LARP, has been evaluating conductors for the MQXFA prototypes, which are the outer magnets of the triplet. Recently, the requirements for MQXF magnets and cables have been published in [P. Ferracin et al., IEEE Trans. Appl. Supercond., vol. 26, no. 4, Jun. 2016, Art. no. 4000207], along with the final specification for Ti-alloyed Nb3Sn conductor determined jointly by CERN and LARP. This paper describes the rationale beneath the 0.85-mm-diameter strand's chief parameters, which are 108 or more subelements, a copper fraction not less than 52.4%, strand critical current at 4.22 K not less than 631 A at 12 T and 331 A at 15 T, and residual resistance ratio of not less than 150. This paper also compares the performance for ~100 km production lots of the five most recent LARP conductors to the first 163 km of strand made according to theHL-LHCspecification.Two factors emerge as significant for optimizing performance and minimizing risk: a modest increase of the subelement diameter from 50 to 55 μm, and a Nb:Sn molar ratio of 3.6 instead of 3.4. The statistics acquired so far give confidence that the present conductor can balance competing demands in production for the HL-LHC project.},

  doi          = {10.1109/TASC.2017.2648738},

  journal      = {IEEE Transactions on Applied Superconductivity},

  number       = 4,

  volume       = 27,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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https://doi.org/10.1109/TASC.2017.2648738

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Works referencing / citing this record:

Precipitous change of the irreversible strain limit with heat-treatment temperature in Nb3Sn wires made by the restacked-rod process
journal, August 2018

Cheggour, Najib; Stauffer, Theodore C.; Starch, William
Scientific Reports, Vol. 8, Issue 1
DOI: 10.1038/s41598-018-30911-x

Implications of the strain irreversibility cliff on the fabrication of particle-accelerator magnets made of restacked-rod-process Nb3Sn wires
journal, April 2019

Cheggour, Najib; Stauffer, Theodore C.; Starch, William
Scientific Reports, Vol. 9, Issue 1
DOI: 10.1038/s41598-019-41817-7

An intermetallic powder-in-tube approach to increased flux-pinning in Nb ₃ Sn by internal oxidation of Zr
journal, November 2017

Motowidlo, L. R.; Lee, P. J.; Tarantini, C.
Superconductor Science and Technology, Vol. 31, Issue 1
DOI: 10.1088/1361-6668/aa980f

More time for Nb ₃ Sn magnet conductors
journal, September 2018

Cooley, Lance D.
Superconductor Science and Technology, Vol. 31, Issue 10
DOI: 10.1088/1361-6668/aadd26

Ternary Nb ₃ Sn superconductors with artificial pinning centers and high upper critical fields
journal, January 2019

Xu, X.; Rochester, J.; Peng, X.
Superconductor Science and Technology, Vol. 32, Issue 2
DOI: 10.1088/1361-6668/aaf7ca

Dipole Magnets Above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors
journal, November 2019

Wang, Xiaorong; Gourlay, Stephen A.; Prestemon, Soren O.
Instruments, Vol. 3, Issue 4
DOI: 10.3390/instruments3040062

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Similar Records

Title: Conductor Specification and Validation for High-Luminosity LHC Quadrupole Magnets

Abstract

Citation Formats

Precipitous change of the irreversible strain limit with heat-treatment temperature in Nb3Sn wires made by the restacked-rod process journal, August 2018

Implications of the strain irreversibility cliff on the fabrication of particle-accelerator magnets made of restacked-rod-process Nb3Sn wires journal, April 2019

An intermetallic powder-in-tube approach to increased flux-pinning in Nb 3 Sn by internal oxidation of Zr journal, November 2017

More time for Nb 3 Sn magnet conductors journal, September 2018

Ternary Nb 3 Sn superconductors with artificial pinning centers and high upper critical fields journal, January 2019

Dipole Magnets Above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors journal, November 2019

Precipitous change of the irreversible strain limit with heat-treatment temperature in Nb3Sn wires made by the restacked-rod process
journal, August 2018

Implications of the strain irreversibility cliff on the fabrication of particle-accelerator magnets made of restacked-rod-process Nb3Sn wires
journal, April 2019

An intermetallic powder-in-tube approach to increased flux-pinning in Nb ₃ Sn by internal oxidation of Zr
journal, November 2017

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