CERN Accelerating science

Published Articles
Report number	FERMILAB-PUB-11-432-TD
Title	Progress in the long $Nb_3Sn$ quadrupole R&D by LARP
Author(s)	Ambrosio, G (Fermilab) ; Andreev, N (Fermilab) ; Anerella, M (Brookhaven) ; Barzi, E (Fermilab) ; Bocian, D (Fermilab) ; Bossert, r (Fermilab) ; Buehler, M (Fermilab) ; Caspi, S (LBL, Berkeley) ; Chlachidze, G (Fermilab) ; Dietderich, D (LBL, Berkeley) ; DiMarco, J (Fermilab) ; Escallier, J (Brookhaven ; LBL, Berkeley) ; Felice, H (Brookhaven ; LBL, Berkeley) ; Ferracin, P (Brookhaven ; LBL, Berkeley) ; Ghosh, A (Brookhaven) ; Godeke, A (LBL, Berkeley) ; Hafalia, A R (LBL, Berkeley) ; Hannaford, R (LBL, Berkeley) ; Jochen, G (Brookhaven) ; Kim, M J (Fermilab) ; Kovach, P (Brookhaven) ; Lamm, M (Fermilab) ; Marchevsky, M (LBL, Berkeley) ; McInturff, A (LBL, Berkeley) ; Nobrega, A (Fermilab) ; Orris, D (Fermilab) ; Prebys, E (Fermilab) ; Prestemon, G I (LBL, Berkeley) ; Sabbi, G L (LBL, Berkeley) ; Schmalzle, J (Brookhaven) ; Sylvester, C (Fermilab) ; Tartaglia, M (Fermilab) ; Turroni, D (Fermilab) ; Velev, G (Fermilab) ; Wanderer, P (Brookhaven) ; Whitson, G (Fermilab) ; Zlobin, A V (Fermilab)
Publication	2012
Imprint	2011-09
Number of pages	4
In:	IEEE Trans. Appl. Supercond. 22 (2012) 4003804
In:	22nd International Conference on Magnet Technology, Marseille, France, 12 - 16 Sep 2011, pp.4003804
DOI	10.1109/TASC.2011.2175894
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Project	CERN HL-LHC
Abstract	After the successful test of the first long quadrupole (LQS01) the US LHC Accelerator Research Program (LARP, a collaboration of BNL, FNAL, LBNL and SLAC) is assessing training memory, reproducibility, and other accelerator quality features of long quadrupole magnets. LQS01b (a reassembly of LQS01 with more uniform and higher pre-stress) was subjected to a full thermal cycle and reached the previous plateau of 222 T/m at 4.5 K in two quenches. A new set of four coils, made of the same type of conductor used in LQS01 (RRP 54/61 by Oxford Superconducting Technology), was assembled in the LQS01 structure and tested at 4.5 K and lower temperatures. The new magnet (LQS02) reached the target gradient (200 T/m) only at 2.6 K and lower temperatures, at inter- mediate ramp rates. The preliminary test analysis, here reported, showed a higher instability in the limiting coil than in the other coils of LQS01 and LQS02.
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