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Report number	FERMILAB-CONF-19-476-TD
Title	Development and First Test of the 15 T Nb$_3$Sn Dipole Demonstrator MDPCT1
Related title	Development and First Test of the 15 T Nb3Sn Dipole Demonstrator MDPCT1
Author(s)	Zlobin, A V (Fermilab) ; Novitski, I (Fermilab) ; Barzi, E (Fermilab) ; Kashikhin, V V (Fermilab) ; Carmichael, J (Fermilab) ; Caspi, S (LBNL, Berkeley) ; Chlachidze, G (Fermilab) ; Krave, S (Fermilab) ; Orozco, C (Fermilab) ; Schoerling, D (CERN) ; Stoynev, S (Fermilab) ; Tommasini, D (CERN) ; Turrioni, D (Fermilab)
Publication	2020
Imprint	2019
Number of pages	5
In:	IEEE Trans. Appl. Supercond. 30 (2020) 4000805
In:	26th International Conference on Magnet Technology (MT-26), Vancouver, Canada, 22 - 27 Sep 2019, pp.4000805
DOI	10.1109/TASC.2020.2967686
Subject category	Accelerators and Storage Rings
Abstract	Fermilab in the framework of the U.S. Magnet Devel-opment Program (MDP) has developed a Nb$_3$Sn dipole demonstrator for a post-LHC hadron collider. The magnet uses 60-mm aperture 4-layer shell-type graded coils. The cable in the two inner-most layers has 28 strands 1.0 mm in diameter and the cable in the two outermost layers has 40 strands 0.7 mm in diameter. An inno-vative mechanical structure based on aluminum I-clamps and a thick stainless steel skin is used to preload Nb$_3$Sn coils and support large Lorentz forces. The maximum field for this magnet is limited by 15 T due to mechanical considerations. The first magnet assembly was done with lower coil pre-load to achieve 14 T and minimize the risk of coil damage during assembly. This paper describes the magnet design and the details of its assembly procedure, and re-ports the results of its cold tests.
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