Detailed Magnetic and Mechanical Design of the Nested Orbit Correctors for HL-LHC

Abstract

The high luminosity upgrade will enhance the discovery

potential of the LHC in the next decade. Among other magnets

and technologies currently under development, the MCBXF orbit

correctors will be required to this end. In order to save space, they

consist in two perpendicularly and coaxially arranged dipole coils

under a large torque. Coils cannot be glued due to the high radiation

dose expected, and mechanical clamping is mandatory. With

the goal of turning the conceptual design into a tangible reality, this

paper depicts the final magnetic design, with special attention to

3-D electromagnetic calculations and the different operation scenarios.

It also includes more accurate mechanical FE models results,

achieved by measuring the Young’s modulus of impregnated

cable stacks. Besides assembly spring-back, cool-down, and energization,

simulations have been also carried out for the pressing

process of both dipoles, analysing stress distribution, and displacements.

Finally, a short mechanical model has been designed, fabricated,

and tested. Its main purpose is to assess the feasibility of the

proposed clamping structure, the reliability of the FE mechanical

models and the design of an important part of the tooling required

for the magnet fabrication.