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Title: Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $$\beta$$ Quadrupole for the High-Luminosity LHC Upgrade

Abstract

As part of the High-Luminosity Large Hadron Collider (LHC) Project, a set of Nb 3 Sn quadrupoles are being developed, aiming to enhance the performance of the inner triplets. The new magnets, identified as MQXFA and MQXFB, will share the same cross section with two different lengths, 4.2 and 7.2 m, respectively. During the magnet development, three short models were tested, along with a number of mechanical models, demonstrating the capability of the magnet cross section to achieve the specified performances. The same performances are now required for the full-length magnets. To ensure this, the authors studied the impact of the magnet length on the capability of the structure to provide an adequate support to the coils. Finite element and simplified analytical models were used to evaluate the impact of the magnet length on the stresses in the magnet ends and coil elongation during powering. Lastly, the models were calibrated using the results from the short model tests, and used to provide an indication on the required prestress and its foreseen impact on the magnet performance.

Authors:
ORCiD logo [1];  [2];  [1];  [3];  [3];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [3];  [1];  [3]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1561884
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

Citation Formats

Vallone, Giorgio, Ambrosio, Giorgio, Bourcey, Nicolas, Anderssen, E., Cheng, Daniel W., Ferracin, Paolo, Grosclaude, Philippe, Guinchard, Michael, Bermudez, Susana Izquierdo, Juchno, Mariusz, Lackner, Friedrich, Pan, Heng, Perez, Juan Carlos, and Prestemon, Soren. Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade. United States: N. p., 2017. Web. doi:10.1109/tasc.2017.2778064.
Vallone, Giorgio, Ambrosio, Giorgio, Bourcey, Nicolas, Anderssen, E., Cheng, Daniel W., Ferracin, Paolo, Grosclaude, Philippe, Guinchard, Michael, Bermudez, Susana Izquierdo, Juchno, Mariusz, Lackner, Friedrich, Pan, Heng, Perez, Juan Carlos, & Prestemon, Soren. Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade. United States. doi:10.1109/tasc.2017.2778064.
Vallone, Giorgio, Ambrosio, Giorgio, Bourcey, Nicolas, Anderssen, E., Cheng, Daniel W., Ferracin, Paolo, Grosclaude, Philippe, Guinchard, Michael, Bermudez, Susana Izquierdo, Juchno, Mariusz, Lackner, Friedrich, Pan, Heng, Perez, Juan Carlos, and Prestemon, Soren. Mon . "Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade". United States. doi:10.1109/tasc.2017.2778064. https://www.osti.gov/servlets/purl/1561884.
@article{osti_1561884,
title = {Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade},
author = {Vallone, Giorgio and Ambrosio, Giorgio and Bourcey, Nicolas and Anderssen, E. and Cheng, Daniel W. and Ferracin, Paolo and Grosclaude, Philippe and Guinchard, Michael and Bermudez, Susana Izquierdo and Juchno, Mariusz and Lackner, Friedrich and Pan, Heng and Perez, Juan Carlos and Prestemon, Soren},
abstractNote = {As part of the High-Luminosity Large Hadron Collider (LHC) Project, a set of Nb3 Sn quadrupoles are being developed, aiming to enhance the performance of the inner triplets. The new magnets, identified as MQXFA and MQXFB, will share the same cross section with two different lengths, 4.2 and 7.2 m, respectively. During the magnet development, three short models were tested, along with a number of mechanical models, demonstrating the capability of the magnet cross section to achieve the specified performances. The same performances are now required for the full-length magnets. To ensure this, the authors studied the impact of the magnet length on the capability of the structure to provide an adequate support to the coils. Finite element and simplified analytical models were used to evaluate the impact of the magnet length on the stresses in the magnet ends and coil elongation during powering. Lastly, the models were calibrated using the results from the short model tests, and used to provide an indication on the required prestress and its foreseen impact on the magnet performance.},
doi = {10.1109/tasc.2017.2778064},
journal = {IEEE Transactions on Applied Superconductivity},
number = 3,
volume = 28,
place = {United States},
year = {2017},
month = {12}
}

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