Design of HQ – a High Field Large Bore Nb3Sn Quadrupole Magnet for LARP

H. Felice, G. Ambrosio, M. Anerella, R. Bossert, S. Caspi,
D. Cheng, D. Dietderich, P. Ferracin, A. K. Ghosh,
R. Hafalia, C. R. Hannaford, V. Kashikhin, J. Schmalze,
S. Prestemon, G.L. Sabbi, P.Wanderer, A.V. Zlobin

Abstract— In support of the Large Hadron Collider luminosity upgrade, a large bore (120 mm) Nb3Sn quadrupole with 15 T peak coil field is being developed within the framework of the US LHC Accelerator Research Program (LARP). The 2-layer design with a 15 mm wide cable is aimed at pre-stress control, alignment and field quality while exploring the magnet performance limits in terms of gradient, forces and stresses. In addition, HQ will determine the magnetic, mechanical, and thermal margins of Nb3Sn technology with respect to the requirements of the luminosity upgrade at the LHC.

Index Terms— Superconducting accelerator magnets, Nb3Sn, IR quadrupole, LARP

Manuscript received 26 August 2008.
This work was supported in part by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, High Energy Physics Division, U.S. Department of Energy, under contract No. DE-AC02-05CH11231.
H.Felice, S. Caspi, D. Dietderich, D. Cheng, P. Ferracin, R. Hafalia, C.R. Hannaford, S. Prestemon and GL Sabbi are with Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA (e-mail: HFelice@lbl.gov).
G. Ambrosio, R. Bossert, V. Kashiskhin and A.Zlobin are with Fermilab National Accelerator Laboratory, Batatvia, IL 60510-0500 USA.
M. Anerella, A. K. Ghosh, J. Schmalze and P. Wanderer are with Brookhaven National Laboratory, NY, USA

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