Mechanical Analysis of the Short Model Magnets for the Nb $_{3}$Sn Low-$\beta$ Quadrupole MQXF

doi:10.1109/tasc.2017.2785388

Title: Mechanical Analysis of the Short Model Magnets for the Nb $$_{3}$$Sn Low-$$\beta$$ Quadrupole MQXF

Abstract

During the development of MQXF, the new Nb₃Sn quadrupole to be used in the large hadron collider (LHC) inner triplets for the High Luminosity upgrade, three short models were tested: MQXFS1, MQXFS3, and MQXFS5. These models differ in the use of thin or thick laminations for the iron components, in the coil design, and in the superconductive strands, rod restack process (RRP) or powder in tube (PIT). In the MQXF design, the azimuthal prestress is provided at room temperature by means of the bladder-key technology, and it is further increased during the cooldown by the differential thermal contraction of the various components. Four aluminum rods provide the longitudinal prestress. Both systems allow for a flexible control of the amount of prestress applied. As a consequence, it was possible to test the models exploring different azimuthal and longitudinal prestress conditions, in an attempt to understand their impact on the magnet performances. Here, this paper studies the mechanical behavior of these short models, also providing the strain and stresses measured by means of strain gauges installed on the aluminum shell, on the winding poles and on the rods. Finally, the paper compares the measures with the results from finite element (FE) models.

Authors:

^[1]; Ambrosio, G. ^[2]; Bajas, H. ^[1]; Bourcey, N. ^[1]; Cheng, D. W. ^[3];

^[2]; Ferracin, P. ^[1]; Grosclaude, P. ^[1]; Guinchard, M. ^[1];

^[1];

^[3];

^[3]; Perez, J. C. ^[1]; Prestemon, S. ^[3];

^[2]

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

Publication Date:: 2017-12-21

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

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

OSTI Identifier:: 1561885

Grant/Contract Number:: AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 28; Journal Issue: 3; 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

Citation Formats


                    Vallone, G., Ambrosio, G., Bajas, H., Bourcey, N., Cheng, D. W., Chlachidze, G., Ferracin, P., Grosclaude, P., Guinchard, M., Bermudez, S. Izquierdo, Juchno, M., Pan, H., Perez, J. C., Prestemon, S., and Strauss, T. Mechanical Analysis of the Short Model Magnets for the Nb $_{3}$Sn Low-$\beta$ Quadrupole MQXF.  United States: N. p., 2017. 
        Web.  doi:10.1109/tasc.2017.2785388.

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                    Vallone, G., Ambrosio, G., Bajas, H., Bourcey, N., Cheng, D. W., Chlachidze, G., Ferracin, P., Grosclaude, P., Guinchard, M., Bermudez, S. Izquierdo, Juchno, M., Pan, H., Perez, J. C., Prestemon, S., & Strauss, T. Mechanical Analysis of the Short Model Magnets for the Nb $_{3}$Sn Low-$\beta$ Quadrupole MQXF.  United States.  doi:10.1109/tasc.2017.2785388.

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                    Vallone, G., Ambrosio, G., Bajas, H., Bourcey, N., Cheng, D. W., Chlachidze, G., Ferracin, P., Grosclaude, P., Guinchard, M., Bermudez, S. Izquierdo, Juchno, M., Pan, H., Perez, J. C., Prestemon, S., and Strauss, T. Thu .  
        "Mechanical Analysis of the Short Model Magnets for the Nb $_{3}$Sn Low-$\beta$ Quadrupole MQXF".  United States.  doi:10.1109/tasc.2017.2785388.  https://www.osti.gov/servlets/purl/1561885.

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@article{osti_1561885,

  title        = {Mechanical Analysis of the Short Model Magnets for the Nb $_{3}$Sn Low-$\beta$ Quadrupole MQXF},

  author       = {Vallone, G. and Ambrosio, G. and Bajas, H. and Bourcey, N. and Cheng, D. W. and Chlachidze, G. and Ferracin, P. and Grosclaude, P. and Guinchard, M. and Bermudez, S. Izquierdo and Juchno, M. and Pan, H. and Perez, J. C. and Prestemon, S. and Strauss, T.},

  abstractNote = {During the development of MQXF, the new Nb3Sn quadrupole to be used in the large hadron collider (LHC) inner triplets for the High Luminosity upgrade, three short models were tested: MQXFS1, MQXFS3, and MQXFS5. These models differ in the use of thin or thick laminations for the iron components, in the coil design, and in the superconductive strands, rod restack process (RRP) or powder in tube (PIT). In the MQXF design, the azimuthal prestress is provided at room temperature by means of the bladder-key technology, and it is further increased during the cooldown by the differential thermal contraction of the various components. Four aluminum rods provide the longitudinal prestress. Both systems allow for a flexible control of the amount of prestress applied. As a consequence, it was possible to test the models exploring different azimuthal and longitudinal prestress conditions, in an attempt to understand their impact on the magnet performances. Here, this paper studies the mechanical behavior of these short models, also providing the strain and stresses measured by means of strain gauges installed on the aluminum shell, on the winding poles and on the rods. Finally, the paper compares the measures with the results from finite element (FE) models.},

  doi          = {10.1109/tasc.2017.2785388},

  journal      = {IEEE Transactions on Applied Superconductivity},

  number       = 3,

  volume       = 28,

  place        = {United States},

  year         = {2017},

  month        = {12}

}

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DOI: 10.1109/tasc.2017.2785388

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Figures / Tables:

Fig. 1: MQXF cross-section (top), and longitudinal view of the short models (bottom). The LHe SS vessel was not installed during the MQXFS1, MQXFS3 and MQXFS5 experiments. The dots show the strain gauge locations on the shell and the winding poles. The vertical line in the bottom view provides theirmore »

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