CERN Accelerating science

Article
Report number	CERN-ATS-2012-033
Title	Design of 11 T Twin-Aperture Nb$_{3}$Sn Dipole Demonstrator Magnet for LHC Upgrades
Author(s)	Karppinen, M (CERN) ; Andreev, N (Fermilab) ; Apollinari, G (Fermilab) ; Auchmann, B (CERN) ; Barz, E (Fermilab) ; Bossert, R (Fermilab) ; Kashikhin, V V (Fermilab) ; Nobrega, A (Fermilab) ; Novitski, I (Fermilab) ; Rossi, L (CERN) ; Smekens, D (CERN) ; Zlobin, A V (Fermilab)
Publication	2012
Imprint	20 Feb 2012
Number of pages	5
In:	IEEE Trans. Appl. Supercond. 22 (2012) 4901504
In:	22nd International Conference on Magnet Technology, Marseille, France, 12 - 16 Sep 2011
DOI	10.1109/TASC.2011.2177625
Subject category	Accelerators and Storage Rings
Abstract	The LHC collimation upgrade foresees two additional collimators installed in the dispersion suppressor regions of points 2, 3 and 7. To obtain the necessary longitudinal space for the collimators, a solution based on an 11 T dipole as replacement of the 8.33 T LHC main dipoles is being considered. CERN and FNAL have started a joint development program to demonstrate the feasibility of Nb$_{3}$Sn technology for this purpose. The program started with the development and test of a 2-m-long single-aperture demonstrator magnet. The goal of the second phase is the design and construction of a series of 2-m-long twin-aperture demonstrator magnets with a nominal field of 11 T at 11.85 kA current. This paper describes the electromagnetic design and gives a forecast of the field quality including saturation of the iron yoke and persistent-current effects in the Nb$_{3}$Sn coils. The mechanical design concepts based on separate collared coils, assembled in a vertically split iron yoke are also discussed.

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