Quench protection study of the updated MQXF for the LHC luminosity upgrade (HiLumi LHC)

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

DOI:https://doi.org/10.1109/TASC.2016.2523548· OSTI ID:1327418

Marinozzi, Vittorio ^[1]; Ambrosio, Giorgio ^[2]; Ferracin, Paolo ^[3]; Izquierdo Bermudez, Susana ^[3]; Rysti, Juho ^[3]; Salmi, Tiina ^[4]; Sorbi, Massimo ^[5]; Todesco, Ezio ^[3]

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1. Univ. of Milano, Milano (Italy)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
3. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
4. Tampere Univ. of Technology, Tampere (Finland)
5. Univ. of Milano, Milan (Italy)

In 2023, the LHC luminosity will be increased, aiming at reaching 3000 fb-1 integrated over ten years. To obtain this target, new Nb₃Sn low-β quadrupoles (MQXF) have been designed for the interaction regions. These magnets present a very large aperture (150 mm, to be compared with the 70 mm of the present NbTi quadrupoles) and a very large stored energy density (120 MJ/m³). For these reasons, quench protection is one of the most challenging aspects of the design of these magnets. In fact, protection studies of a previous design showed that the simulated hot spot temperature was very close to the maximum allowed limit of 350 K; this challenge motivated improvements in the current discharge modeling, taking into account the so-called dynamic effects on the apparent magnet inductance. Moreover, quench heaters design has been studied to be going into more details. In this study, a protection study of the updated MQXF is presented, benefiting from the experience gained by studying the previous design. As a result, a study of the voltages between turns in the magnet is also presented during both normal operation and most important failure scenarios.

• 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: 1327418
• Report Number(s): FERMILAB-PUB-16-396-TD; 1479356
• 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
niobium compounds
quench protection
superconducting accelerators
heating
superconducting magnets
magnetic separation
delays
Large Hadron Collider
coils
temperature