Design Challenges for a Wide-Aperture Insertion Quadrupole Magnet

The design and development of a superconducting (Nb-Ti) quadrupole with 120-mm aperture, for an upgrade of the LHC insertion region, faces challenges arising from the LHC beam optics requirements and the heat-deposition. The first triggered extensive studies of coil alternatives with four and six co...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2011-06, Vol.21 (3), p.1674-1678
Main Authors: Russenschuck, S, Auchmann, B, Perez, J C, Ramos, D, Fessia, P, Karppinen, M, Kirby, G, Sahner, T, Schwerg, N
Format: Article
Language:English
Subjects:
Applied sciences
Assembly
CADCAM
Cyclic accelerators and storage rings
Electrical engineering. Electrical power engineering
Electromagnets
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
Heating
Insulation
Large Hadron Collider
Low-beta insertions
magnet design
Magnetomechanical effects
Miscellaneous
Nuclear physics
Physics
Superconducting magnets
superconducting quadrupole
Various equipment and components
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Summary:The design and development of a superconducting (Nb-Ti) quadrupole with 120-mm aperture, for an upgrade of the LHC insertion region, faces challenges arising from the LHC beam optics requirements and the heat-deposition. The first triggered extensive studies of coil alternatives with four and six coil-blocks in view of field quality and operation margins. The latter requires more porous insulation schemes for both the cables and the ground-plane. This in turn necessitates extensive heat propagation and quench-velocity studies, as well as more efficient quench heaters. The engineering design of the magnet includes innovative features such as self-locking collars, which will enable the collaring to be performed with the coils on a horizontal assembly bench, a spring-loaded and collapsible assembly mandrel, tuning-shims for field quality, porous collaring-shoes, and coil end-spacer design based on differential geometry methods. The project also initiated code extensions in the quench-simulation and CAD/CAM modules of the CERN field computation program ROXIE.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2011.2105453