Assembly and Warm Magnetic Measurement of MQYYM: A 90 mm NbTi Quadrupole Magnet Option for HL-LHC

S. Perraud (1) , D. Simon (1) , H. Felice (1) , M. Segreti (1) , A. Madur (1) , J.M. Rifflet (1) , R.Correia Machado (1) , R. Godon (1) , D. Bouziat (1) , S.Emami Naini , L. Fiscarelli , A. Foussat , J.M. Gheller (1) , M. Guinchard , G. Minier (1) , J.C. Perez , C. Petrone , E. Todesco

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

In the framework of the HL-LHC project, a NbTi double aperture quadrupole magnet MQYY is being developed as an option to replace the LHC magnet MQY. This 90 mm double aperture cos-2θ quadrupole has an operating gradient of 120 T/m at 1.9 K. To demonstrate the validity of the design, a single aperture short model of 1.2 m called MQYYM has been developed. Designed by CEA and manufactured in collaboration with CERN, the MQYYM magnet is being prepared for cold test at CEA in a dedicated cryogenic station with LHe bath at 1 bar 4.2 K and 23 mbar 1.9 K. First, this paper will summarize the initial and as-built magnet designs based on the assembly at CERN. Second, updated mechanical measurements of collaring and axial pre-loading will be presented. Finally warm magnetic measurements performed at CERN during the assembly and at CEA during test preparation will be detailed.

Mots clés: Superconducting magnets; Magnetomechanical effects; Temperature measurement; Stress; Strain; Magnetic variables measurement; Apertures; NbTi; superconducting accelerator magnet; quadrupole; LHC luminosity upgrade; CERN LHC Coll; magnet: design; magnet: superconductivity; luminosity: upgrade; quadrupole lens; fabrication; performance; niobium: titanium

Domaines: Physique des accélérateurs [physics.acc-ph]

S. Perraud, D. Simon, H. Felice, M. Segreti, A. Madur, et al.. Assembly and Warm Magnetic Measurement of MQYYM: A 90 mm NbTi Quadrupole Magnet Option for HL-LHC. IEEE Transactions on Applied Superconductivity, 2021, 31 (5), pp.4000705. ⟨10.1109/TASC.2021.3060363⟩. ⟨hal-03210430⟩