Quench protection studies of the 11-T Nb₃Sn dipole for the LHC upgrade

Journal Article · Wed Jun 01 00:00:00 EDT 2016 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/TASC.2016.2536653· OSTI ID:1327422

Bermudez, Susana Izquierdo ^[1]; Auchmann, Bernhard ^[1]; Bajas, Hugues ^[1]; Bajko, Marta ^[1]; Bordini, Bernardo ^[1]; Bottura, Luca ^[1]; Chlachidze, Guram ^[2]; Karppinen, Mikko ^[1]; Rysti, Juho ^[1]; Savary, Frederic ^[1]; Willering, Gerard ^[1]; Zlobin, Alexander V. ^[2]

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1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

The planned upgrade of the LHC collimation system foresees additional collimators to be installed in the dispersion suppressor areas. Fermilab and CERN are developing an 11 T Nb₃Sn dipole to replace some 8.33 T-15-m-long Nb-Ti LHC main dipoles providing longitudinal space for the collimators. In case of a quench, the large stored energy and the low copper stabilizer fraction make the protection of the 11 T Nb₃Sn dipoles challenging. This paper presents the results of quench protection analysis, including quench protection heater design and efficiency, quench propagation and coil heating. The numerical results are compared with the experimental data from the 2-m-long Nb₃Sn dipole models. Here, the validated model is used to predict the current decay and hot spot temperature under operating conditions in the LHC and the presently foreseen magnet protection scheme is discussed.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1327422
• Report Number(s): FERMILAB-PUB-16-399-TD; 1425906
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 26, Issue 4; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
LHC upgrade
quench protection
high field accelerator magnets
delays
resistance heating
superconducting magnets
Large Hadron Collider
temperature measurement
conductors