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

Journal Article · Thu Dec 21 00:00:00 EST 2017 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2017.2785388· OSTI ID:1561885

Vallone, G.  ^[1]; Ambrosio, G. ^[2]; Bajas, H. ^[1]; Bourcey, N. ^[1]; Cheng, D. W. ^[3]; Chlachidze, G.  ^[2]; Ferracin, P. ^[1]; Grosclaude, P. ^[1]; Guinchard, M. ^[1]; Bermudez, S. Izquierdo  ^[1]; Juchno, M.  ^[3]; Pan, H.  ^[3]; Perez, J. C. ^[1]; Prestemon, S. ^[3]; Strauss, T.  ^[2]

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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)

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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1561885
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 3; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY