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Title	Test results of TQS03: A LARP shell-based Nb$_3$Sn quadrupole using 108/127 conductor
Related title	Test results of TQS03: A LARP shell-based Nb3Sn quadrupole using 108/127 conductor
Author(s)	Felice, H (LBNL, Berkeley) ; Ambrosio, G (Fermilab) ; Bajko, M (CERN) ; Barzi, E (Fermilab) ; Bordini, B (CERN) ; Bossert, R (Fermilab) ; Caspi, S (LBNL, Berkeley) ; Dietderich, D (LBNL, Berkeley) ; Ferracin, P (LBNL, Berkeley) ; Feuvrier, J (CERN) ; Ghosh, A (Brookhaven Natl. Lab.) ; Godeke, A (LBNL, Berkeley) ; Lizarazo, J (LBNL, Berkeley) ; Rossi, L (CERN) ; Sabbi, G (LBNL, Berkeley) ; Wanderer, P (Brookhaven Natl. Lab.) ; Wang, X (LBNL, Berkeley) ; Zlobin, A V (Fermilab)
Publication	2010
Number of pages	14
In:	J. Phys.: Conf. Ser. 234 (2010) 032010
In:	9th European Conference on Applied Superconductivity, Dresden, Germany, 13 - 17 Sep 2009
DOI	10.1088/1742-6596/234/3/032010
Subject category	Accelerators and Storage Rings ; Accelerators and Storage Rings
Accelerator/Facility, Experiment	LARP
Abstract	Future insertion quadrupoles with large apertures and high gradients will be required for the Phase II luminosity upgrade (10$^{35}$ cm$^{−2}$s$^{−1}$) of the Large Hadron Collider (LHC). Although improved designs, based on NbTi, are being considered as an intermediate step for the Phase I upgrade, the Nb$_3$Sn conductor is presently the best option that meets the ultimate performance goals for both operating field and temperature margin. As part of the development of Nb$_3$Sn magnet technology, the LHC Accelerator Research Program (LARP) developed and tested several 1-meter long, 90-mm aperture Nb$_3$Sn quadrupoles. The first two series of magnet used OST MJR 54/61 (TQ01 series) and OST RRP 54/61 (TQ02 series) strands. The third series (TQ03) used OST RRP 108/127 conductor. The larger number of sub-elements and the consequent reduction of the effective filament size, together with an increased fraction of copper and a lower Jc were expected to improve the conductor stability. The new coils were tested in the TQS03 series using a shell structure assembled with keys and bladders. The objective of the first test (TQS03a) was to evaluate the performances of the 108/127 conductor and, in particular, its behaviour at 1.9 K, while the second test (TQS03b) investigated the impact on high azimuthal pre-stress on the magnet performance. This paper reports on TQS03 fabrication, the strain gauge measurements performed during assembly, cool-down, excitation and the quench behaviour of the two magnets.

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