Development of a Nb3Sn quadrupole magnet model

CEA, Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette
IEEE Transactions on Applied Superconductivity (Impact Factor: 1.2). 04/2001; DOI: 10.1109/77.920291
Source: IEEE Xplore

ABSTRACT One possible application of Nb3Sn, whose
superconducting properties far exceed those of NbTi, is the fabrication
of short and powerful quadrupole magnets for the crowded interaction
regions of large particle accelerators. To learn about Nb3Sn
technology and to evaluate fabrication techniques, DAPNIA/STCM at
CEA/Saclay has undertaken an R&D program aimed at designing and
building a 1 m-long, 56 mm single-aperture quadrupole magnet model. The
model relies on the same coil geometry as the LHC arc quadrupole
magnets, but has no iron yoke. It is expected to produce a nominal field
gradient of 211 T/m at 11870 A. The coils are wound from Rutherford-type
cables insulated with quartz fiber tapes, before being heat-treated and
vacuum-impregnated with epoxy resin. Laminated, austenitic collars,
locked around the coil assembly by means of keys restrain the Lorentz
forces. After reviewing the conceptual design of the magnet model, we
report on the cable and cable insulation development programs and we
present the results of NbTi-Nb3Sn cable splice tests