Test Results of the First 3.7 m Long Nb3Sn Quadrupole by LARP and Future Plans

TLDR: The first Long Nb3Sn Quadrupole made by LARP (LHC Accelerator Research Program, a collaboration of BNL, FNAL, LBNL and SLAC), reached its target field gradient of 200 T/m during its first cold test as discussed by the authors.

Abstract: In December 2009 during its first cold test, LQS01, the first Long Nb3Sn Quadrupole made by LARP (LHC Accelerator Research Program, a collaboration of BNL, FNAL, LBNL and SLAC), reached its target field gradient of 200 T/m. This target was set in 2005 by the US Department of Energy, CERN and LARP, as a significant milestone toward the development of Nb3Sn quadrupoles for possible use in LHC luminosity upgrades. LQS01 is a 90 mm aperture, 3.7 m long quadrupole using Nb3Sn coils. The coil layout is equal to the layout used in the LARP Technological Quadrupoles (TQC and TQS models). Pre-stress and support are provided by a segmented aluminum shell pre-loaded using bladders and keys, similarly to the TQS models. After the first test the magnet was disassembled, reassembled with an optimized pre-stress, and reached 222 T/m at 4.5 K. In this paper we present the results of both tests and the next steps of the Long Quadrupole R&D.

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This work was supported 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.
Test Results of the First 3. 7 m Long Nb
3
Sn Quadrupole by LARP and Future Plans
G. Ambrosio, N. Andreev, E. Barzi, D. Bocian, R. Bossert, G. Chlachidize, V. V.
Kashikhin, M. J. Kim, M. Lamm, F. Nobrega, I. Novitsky, D. Orris, E. Prebys, C.
Sylverster, M. Tartaglia, D. Turrioni, G. Velev, G. Whitson, A. V. Zlobin
Fermilab National Laboratory, Batavia, IL 60510
M. Anerella, J. Escallier, G. Ghosh, G. Jochen, P. Kovach, J. Muratore, J.
Schmalzle, P. Wanderer
Brookhaven National Laboratory, Upton, NY 11973-5000
B. Bingham, S. Caspi, D. Dietderich, H. Felice, P. Ferracin, A. Godeke, R. Hafalia,
R. Hannaford, A. McInturff, S. Prestemon, and G.L. Sabbi
Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley CA 94720
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