Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$_{3}$Sn Low-$\beta$ Quadrupole MQXF

Vallone, Giorgio; Ambrosio, Giorgio; Anderssen, Eric C.; Bajas, Hugo; Bourcey, Nicolas; Cheng, Daniel W.; Chlachidze, Guram; Ferracin, Paolo; Grosclaude, Philippe; Guinchard, Michael; Bermudez, Susana Izquierdo; Juchno, Mariusz; Pan, Heng; Perez, Juan Carlos; Prestemon, Soren; Strauss, Thomas

doi:10.1109/tasc.2019.2898327

Title: Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$$_{3}$$Sn Low-$$\beta$$ Quadrupole MQXF

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Abstract

The Nb₃Sn quadrupole MQXF is being developed as a part of the large hadron collide (LHC) High Luminosity upgrade. The magnet design was tested on 1.5-m-long short models, sharing the same cross section with the full-length magnets. Various azimuthal and longitudinal preloads were applied, studying the impact on the magnet training and on its mechanical performances. The experiments demonstrated the possibility to control the magnet prestress. However, various factors, coil size among the others, may affect the stress variation between and within each winding. This variation could prevent the magnets from reaching the magnet performances, as for example as a result of the critical current reduction of the Nb₃Sn strands. This paper analyzes the mechanical performances of the short models, studying in particular the stress variation on different coils. The measured coil size was used as input in the numerical simulations, and the results were then compared with the strain gauge measurements. Lastly, the short model experience was used to evaluate the feasibility of a loading operation that does not rely on the strain measurements.

Authors:

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^[3];

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^[3]; Grosclaude, Philippe ^[3]; Guinchard, Michael ^[3];

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Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)

Publication Date:: Fri Feb 08 00:00:00 EST 2019

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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

OSTI Identifier:: 1564057

Grant/Contract Number:: AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 29; Journal Issue: 5; Journal ID: ISSN 1051-8223

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

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; high Luminosity LHC; low- $\beta$ quadrupole; Nb3Sn magnet; mechanical performance; short model

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                    Vallone, Giorgio, Ambrosio, Giorgio, Anderssen, Eric C., Bajas, Hugo, Bourcey, Nicolas, Cheng, Daniel W., Chlachidze, Guram, Ferracin, Paolo, Grosclaude, Philippe, Guinchard, Michael, Bermudez, Susana Izquierdo, Juchno, Mariusz, Pan, Heng, Perez, Juan Carlos, Prestemon, Soren, and Strauss, Thomas. Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$_{3}$Sn Low-$\beta$ Quadrupole MQXF.  United States: N. p., 2019. 
Web.  doi:10.1109/tasc.2019.2898327.

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                    Vallone, Giorgio, Ambrosio, Giorgio, Anderssen, Eric C., Bajas, Hugo, Bourcey, Nicolas, Cheng, Daniel W., Chlachidze, Guram, Ferracin, Paolo, Grosclaude, Philippe, Guinchard, Michael, Bermudez, Susana Izquierdo, Juchno, Mariusz, Pan, Heng, Perez, Juan Carlos, Prestemon, Soren, & Strauss, Thomas. Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$_{3}$Sn Low-$\beta$ Quadrupole MQXF.  United States.  https://doi.org/10.1109/tasc.2019.2898327

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                    Vallone, Giorgio, Ambrosio, Giorgio, Anderssen, Eric C., Bajas, Hugo, Bourcey, Nicolas, Cheng, Daniel W., Chlachidze, Guram, Ferracin, Paolo, Grosclaude, Philippe, Guinchard, Michael, Bermudez, Susana Izquierdo, Juchno, Mariusz, Pan, Heng, Perez, Juan Carlos, Prestemon, Soren, and Strauss, Thomas. Fri .  
"Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$_{3}$Sn Low-$\beta$ Quadrupole MQXF".  United States.  https://doi.org/10.1109/tasc.2019.2898327.  https://www.osti.gov/servlets/purl/1564057.

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@article{osti_1564057,

  title        = {Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$_{3}$Sn Low-$\beta$ Quadrupole MQXF},

  author       = {Vallone, Giorgio and Ambrosio, Giorgio and Anderssen, Eric C. and Bajas, Hugo and Bourcey, Nicolas and Cheng, Daniel W. and Chlachidze, Guram and Ferracin, Paolo and Grosclaude, Philippe and Guinchard, Michael and Bermudez, Susana Izquierdo and Juchno, Mariusz and Pan, Heng and Perez, Juan Carlos and Prestemon, Soren and Strauss, Thomas},

  abstractNote = {The Nb3Sn quadrupole MQXF is being developed as a part of the large hadron collide (LHC) High Luminosity upgrade. The magnet design was tested on 1.5-m-long short models, sharing the same cross section with the full-length magnets. Various azimuthal and longitudinal preloads were applied, studying the impact on the magnet training and on its mechanical performances. The experiments demonstrated the possibility to control the magnet prestress. However, various factors, coil size among the others, may affect the stress variation between and within each winding. This variation could prevent the magnets from reaching the magnet performances, as for example as a result of the critical current reduction of the Nb3Sn strands. This paper analyzes the mechanical performances of the short models, studying in particular the stress variation on different coils. The measured coil size was used as input in the numerical simulations, and the results were then compared with the strain gauge measurements. Lastly, the short model experience was used to evaluate the feasibility of a loading operation that does not rely on the strain measurements.},

  doi          = {10.1109/tasc.2019.2898327},

  journal      = {IEEE Transactions on Applied Superconductivity},

  number       = 5,

  volume       = 29,

  place        = {United States},

  year         = {Fri Feb 08 00:00:00 EST 2019},

  month        = {Fri Feb 08 00:00:00 EST 2019}

}

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