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[show abstract]
[hide abstract]
ABSTRACT: For reasons of geometrical acceptance, 70 mm bore twin aperture
quadrupoles are required in the LHC insertions. For an operating
gradient of 160 T/m at 4.5 K, a design based on a four layer coil wound
from two graded 8.2 mm NbTi conductors has been developed. Three 1 m
single aperture quadrupoles of this design have been built and
successfully tested. Thereafter, the magnets have been disassembled and
the coils re-collared using self-supporting collars. In this paper, we
describe the design features of the twin aperture quadrupole, and report
on the initial collaring tests and procedures for collaring and final
assembly of the 1 m magnet
IEEE Transactions on Appiled Superconductivity 04/2000; · 1.04 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: Three 70 mm aperture 1-meter superconducting quadrupole magnets
for the LHC low-β insertions have been designed and built in
collaboration between CERN and Oxford Instruments. These magnets feature
a four layer coil wound from two 8.2 mm wide graded NbTi cables. In this
paper, the authors present the results from the tests at 4.4 K and 1.9 K
of the third quadrupole (Q3), with an emphasis on studies concerning
quench protection. After a summary of Q3 training in three thermal
cycles, quench velocities, peak temperatures in the two superconducting
cables and the performance of the layer strip heaters are reported
IEEE Transactions on Appiled Superconductivity 07/1999; · 1.04 Impact Factor
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S.R. Milward,
J.M. Morris,
S. Nobes,
K.D. Smith,
A.J. Street,
M.C. Townsend, J.R. Treadgold,
J.M. Wiatrzyk,
G.A. Kirby,
R. Ostojic,
T.M. Taylor,
J. Strait
[show abstract]
[hide abstract]
ABSTRACT: Within the LHC magnet development program Oxford Instruments has
built a one metre model of the 70 mm aperture low-β quadrupole. The
magnet features a four layer coil wound from two 8.2 mm wide graded NbTi
cables, and is designed for 250 T/m at 1.9 K. The magnet has previously
been tested between 4.5 K and 23 K. In this paper we review the magnet
rebuild and the subsequent tests. Results on magnet training at 43 K and
1.9 K are presented along with the results related to quench protection
studies. We also present the first results of magnetic field
measurements done at room and liquid nitrogen temperatures
IEEE Transactions on Appiled Superconductivity 07/1997; · 1.04 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: Within the LHC magnet development program Oxford Instruments has built a one metre model of the 70 mm aperture low-beta quadrupole. The magnet features a four layer coil wound from two 8.2 mm wide graded NbTi cables, and is designed for 250 T/m at 1.9 K. The magnet has previously been tested between 4.5 K and 2.3 K. In this paper we review the magnet rebuild and the subsequent tests. Results on magnet training at 4.3 K and 1.9 K are presented along with the results related to quench protection studies.
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[show abstract]
[hide abstract]
ABSTRACT: For reasons of geometrical acceptance, 70 mm bore twin aperture quadrupoles are required in the LHC insertions. For an operating gradient of 160 T/m at 4.5 K, a design based on a four layer coil wound from two graded 8.2 mm NbTi conductors has been developed. Three 1 m single aperture quadrupoles of this design have been built and successfully tested. Thereafter, the magnets have been disassembled and the coils re-collared using self-supporting collars. In this paper, we describe the design features of the twin aperture quadrupole, and report on the initial collaring tests and procedures for collaring and final assembly of the 1 m magnet.
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R Ostojic,
G A Kirby,
R Schmidt,
T M Taylor,
S R Milward,
J Morris,
S Nobes,
K Smith,
A J Street,
M C Townsend, J R Treadgold,
J M Wiatrzyk,
S A Gourlay,
J B Strait
[show abstract]
[hide abstract]
ABSTRACT: As part of the LHC magnet development program, CERN in collaboration with Oxford Instruments has designed, built and tested a one metre model of a 70 mm aperture low-beta quadrupole. The magnet features a four layer coil, and is designed for 250 T/m at 1.9 K. We review the results of the magnet training and quench propagation studies performed at 4.3 K and 1.9 K, and report on the magnetic field measurements.
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L Bottura,
C Giloux,
G A Kirby,
M.J. Lamm,
S R Milward,
R Ostojic,
F. Rival,
F Rodríguez-Mateos,
S Schloss,
A Siemko,
K.D. Smith,
T M Taylor,
M C Townsend, J R Treadgold,
J M Wiatrzyk
[show abstract]
[hide abstract]
ABSTRACT: Following the successful testing of the first 1-metre model of the 70 mm aperture quadrupole for the LHC low-beta insertions, two further 1-metre magnets have been built. All magnets feature a four-layer coil wound from two 8.2 mm wide graded NbTi cables and a four-way split yoke supporting structure. In this paper we review the training history of the three magnets performed at 4.3 K and 1.9 K in several tests. All magnets surpassed the operating gradient required for the LHC, with the third magnet reaching 260 T/m, its short-sample gradient at 1.9 K. The peak temperatures in the superconductor at various operating conditions are reported and a summary of magnetic field measurements is given.
