Mechanical Design of an Alternate Structure for LARP Nb3Sn Quadrupole Magnets for LHC Page: 3 of 5
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BNL-95246-2011-CP
Submitted at the Particle Accelerator Conference (PACl1), New York City, NY - March 28-April 1, 2011
MECHANICAL DESIGN OF AN ALTERNATE STRUCTURE FOR LARP
NB3SN QUADRUPOLE MAGNETS FOR LHC*
J. Schmalzle, M. Anerella, J. Cozzolino, P. Kovach, P. Wanderer, BNL, Upton, NY, G. Ambrosio,
M. Lamm, FNAL, Batavia, IL, S. Caspi, H. Felice, P. Ferracin, G. Sabbi, LBNL, Berkeley, CAAbstract
An alternative structure for the 120 mm Nb3Sn
quadrupole magnet is presently under development for
use in the upgrade for LHC at CERN. The design aims to
build existing technology developed in LARP with the
LQ and HQ magnets and to further optimize the features
required for operation in the accelerator. The structure
includes features for maintaining mechanical alignment of
the coils to achieve the required field quality. It also
includes a helium containment vessel and provisions for
cooling with 1.9 K helium. The development effort
includes the assembly of a six inch model to verify
required coil load is achieved. Status of the R&D effort
and an update on the magnet design, including its
incorporation into the design of a complete one meter
cold mass is presented.
INTRODUCTION
LARP is presently building 90 mm aperture (LQ) [1]
and 120 mm aperture (HQ) [2] R&D niobium tin
quadrupole cold masses in support of the upgrade to the
LHC [3] at CERN. These cold masses utilize aluminum
shell support systems with "bladder and key" technology
[4-9]. This alternate structure [10] attempts to employ all
the benefits of the existing LQ and HQ structures while
making important improvements. Specifically the
structure includes holes in the yoke for helium cooled
heat exchangers. The structure replaces the bolted pads /
collars with more traditional keyed aluminum collars
while still utilizing the support shell and "bladder and
key" assembly for reliable coil loading. In this structure
the parting planes of the yoke coincide with the coil
midplanes to permit continuous alignment of the coils to
the exterior survey locations in the helium vessel. Finally
the structure utilizes the stainless steel helium vessel for
support of axial Lorentz forces, eliminating tie rods and
permitting the maximum area for helium cooling. Since
last presented [10] the design has been further developed.
Presented here are the latest design and assembly features
and an update to the analysis results.
DESIGN
The latest 2-D cross-section of the cold mass structure
is shown in Figure 1.r
1Alruinun Shell
/ Helium Holes
f $4 Abqnment Slots
,., f Lad Keys
f f Blodder SI
- Aluminum
aCo not
.1 .
4-'.4
Collars
Keys* *
Figure 1: 2-D View of Support Structure.
The design of the yoke has been modified to provide
more direct transfer of alignment from the collars to the
outside of the coldmass. The outer yoke has been split to
allow direct access to the inner yoke through the holes in
the support shell without the need to transfer alignment
between the inner yoke and outer yoke. The width of the
loading bladders has been increased and the number of
bladders has been reduced. Other minor changes,
including the incorporation of yoke load keys that
function independently from the alignment keys, have
been incorporated to aid in assembly and to ensure that
proper alignment is maintained.
A 3-D cutaway view of the coldmass can be seen in
figure 4.
SSI Shell
End PRote-~
End Docme
.>,. K*Work supported by the U.S. Department of Energy under Contract No.
DE-AC02-98CH10886.Figure 4: 3-D Cutaway View of Coldmass.
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J., Schmalzle; Anerella, M.; Cozzolino, J.; Kovach, P.; Wanderer, P.; Lamm, M. et al. Mechanical Design of an Alternate Structure for LARP Nb3Sn Quadrupole Magnets for LHC, article, March 28, 2011; United States. (https://digital.library.unt.edu/ark:/67531/metadc828299/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.