Shell-Based Support Structures for Nb3Sn Accelerator Quadrupole Magnets Page: 3 of 4
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The e.m forces push the coil against the structure (Fig 2,
bottom right), at the same time unloading the pole: the
bladder pressure is chosen in order to guarantee full
contact between coil and pole when the magnet is
energized (Fig. 3)
~~i !~ * - * u
293 K 0% F,
containment. A preliminary cross-section of HQ is shown
in Fig. 5. The structure components are aligned through
round pins between shell and yokes and keys between
pads and yokes. The coil is surrounded by aluminum
bolted collars which align the coil poles to the pads. An
external stainless steel tube is currently considered as a
possible LHe containment.
ladder p = 20MPa
ladder P. = 30 MPa
laddei p 40OMPa
100% F e
Figure 3: Contact pressure between coil and pole (MPa)
during assembly, cool-down, and excitation (as a function
of the fraction of nominal electro-magnetic force). Data
are plotted assuming three different bladder pressures.
Coil axial support
In order to reduce the conductor motion in the end
region resulting from axial e.m forces, a longitudinal
support system is included in the design (Fig. 4 left). Four
aluminum rods are inserted in the four holes of the pads,
and bolted to two stainless steel end plates. The rods are
pre-tensioned with an axial piston at room temperature
(Fig. 4 right) and, similarly to the outer shell, they
significantly increased their stress during cool-down.
Figure 4: Coil axial support: end-plate (left) and pre-load
system composed by an additional plate and a piston
NEXT STEP: HQ
Following the experience gained with the SQ, TQ, and
LQ programs, LARP is now designing HQ, whose goals
are to explore the performance limits in terms of peak
fields (> 15 T), forces and stresses, and to include in the
design accelerator quality features as alignment and LHe
Figure 5: Cross-section of HQ.
 S.A. Gourlay, et al., "Magnet R&D for the US LHC
Accelerator Research Program", IEEE Trans. Appl.
Supercond. 16 (2005) 324.
 A. R. Hafalia, et al., "An approach for faster high
field magnet technology development", IEEE Trans.
Appl. Supercond. 13 (2003) 1258.
 A. R. Hafalia, et al., "A new support structure for
high field magnets" IEEE Trans. Appl. Supercond. 12
 P. Ferracin, et al., "Development of a large aperture
Nb3Sn racetrack quadrupole magnet", IEEE Trans.
Appl. Supercond. 15 (2005) 1132.
 P. Ferracin, et al., "Assembly and test of SQ01b, a
Nb3Sn quadrupole magnet for the LHC Accelerator
Research Program", IEEE Trans. Appl. Supercond.
16 (2006) 382.
 P. Ferracin, et al., "Assembly and Tests of SQ02, a
Nb3Sn Racetrack Quadrupole Magnet for LARP",
IEEE Trans. Appl. Supercond. 17 (2007) 1019.
 P. Ferracin, et al., "Effect of Axial Loading on
Quench Performance in Nb3Sn Magnets", IEEE
Trans. Appl. Supercond. 18 (2008) 285.
 G. Sabbi et al., "Nb3Sn quadrupole magnets for the
LHC IR", IEEE Trans. Appl. Supercond. 13 (2003)
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Ferracin, Paolo. Shell-Based Support Structures for Nb3Sn Accelerator Quadrupole Magnets, article, May 19, 2008; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc929337/m1/3/: accessed June 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.