Mechanical qualification of the support structure for MQXF, the Nb₃Sn low-β quadrupole for the high luminosity LHC

Journal Article · Tue Jan 26 00:00:00 EST 2016 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/TASC.2016.2521893· OSTI ID:1249204

Juchno, M. ^[1]; Ambrosio, G. ^[2]; Anerella, M. ^[3]; Bajas, H. ^[1]; Bajko, M. ^[1]; Bourcey, N. ^[1]; Cheng, D. W. ^[4]; Felice, H. ^[4]; Ferracin, P. ^[1]; Grosclaude, P. ^[1]; Guinchard, M. ^[1]; Perez, J. C. ^[1]; Prin, H. ^[1]; Schmalzle, J. ^[3]

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1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
3. Brookhaven National Lab. (BNL), Upton, NY (United States)
4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Within the scope of the High-Luminosity LHC project, the collaboration between CERN and U.S. LARP is developing new low-$$\beta$$ quadrupoles using the Nb 3 Sn superconducting technology for the upgrade of the LHC interaction regions. The magnet support structure of the first short model was designed, and two units were fabricated and tested at CERN and at LBNL. The structure provides the preload to the collar-coil subassembly by an arrangement of outer aluminum shells pretensioned with water-pressurized bladders. For the mechanical qualification of the structure and the assembly procedure, superconducting coils were replaced with solid aluminum 'dummy coils,' and the structure was preloaded at room temperature and then cooled-down to 77 K. The mechanical behavior of the magnet structure was monitored with the use of strain gauges installed on the aluminum shells, the dummy coils, and the axial preload system. This paper reports on the outcome of the assembly and the cooldown tests with dummy coils, which were performed at CERN and at LBNL, and presents the strain gauge measurements compared with the 3-D finite-element model predictions.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: LARP
• Grant/Contract Number: AC02-07CH11359; AC02-05CH11231
• OSTI ID: 1249204
• Alternate ID(s): OSTI ID: 1454467
• Report Number(s): FERMILAB-PUB-16-052-TD; 1432646
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 815, Issue C; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
high luminosity LHC
low-β quadrupoles
Nb3Sn magnets
short model
support structure