Mechanical Performance of Short Models for MQXF, the Nb3Sn Low-β Quadrupole for the Hi-Lumi LHC

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Section: Introductionmentioning

confidence: 99%

Mechanical Design Studies of the MQXF Long Model Quadrupole for the HiLumi LHC

Pan¹,

Anderssen²,

Ambrosio³

et al. 2017

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“…For the 2D model, the Lorentz forces are applied from a previous ANSYS magnetic model solution, and for the 3D models the Lorentz forces are calculated at the element centroids in Opera3D and then transferred to ANSYS. Unless mentioned, the contact condition between layers is sliding with a friction coefficient of 0.2 and isotropic, blended material properties are assumed for the conductor regions with values consistent with what is used in the design of the Nb 3 Sn LARP quadrupoles [15], [16].…”

Section: Mechanical Modeling For Cct4mentioning

confidence: 99%

Improved Modeling of Canted–Cosine–Theta Magnets

Brouwer

Arbelaez

Caspi

et al. 2018

Abstract-The Canted-Cosine-Theta is a design option for the next generation of high field superconducting dipoles being pursued within the US Magnet Development Program. This paper presents new modeling techniques developed for design and analysis of CCT magnets. For mechanical modeling in ANSYS, three approaches with increasing accuracy are compared: 2-D symmetry models; 3-D periodic symmetry models; and full 3-D models. Methods for the static and transient magnetic simulation using ANSYS are presented with a focus on circuit-coupled models for predicting magnet behavior following quench. Where applicable, simulation results are compared to data from CCT magnet tests at Berkeley.

“…T HE Nb 3 Sn quadrupole MQXF will be installed in the LHC triplets as a part of the High Luminosity upgrade [1]. The magnet will be produced in two different magnetic lengths, 4.2 m (MQXFA) and 7.15 m (MQXFB), aiming for an ultimate gradient of 143.2 T/m in a 150 mm aperture, at an ultimate current of 17.89 kA [2].…”

Section: Introductionmentioning

confidence: 99%

“…1, with the accelerator magnets. The mechanical performance of the structure was monitored during assembly, cooldown and powering by means of electrical strain gauges, installed on the aluminum shells and on the winding poles [3].…”

Section: Introductionmentioning

confidence: 99%

Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb<inline-formula> <tex-math notation="LaTeX">$_{3}$</tex-math> </inline-formula>Sn Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole MQXF

Vallone

Ambrosio

Anderssen

et al. 2019

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The Nb 3 Sn quadrupole MQXF is being developed as a part of the LHC High Luminosity upgrade. The magnet design was tested on 1.5 m long short models, sharing the same cross-section with the full-length magnets. Various azimuthal and longitudinal preloads were applied, studying the impact on the magnet training and on its mechanical performances. The experiments demonstrated the possibility to control the magnet prestress. However, various factors, coil size among the others, may affect the stress variation between and within each winding. This variation could prevent the magnet to reach the desired performances, for example as result of critical current degradation of the Nb 3 Sn strands. This paper analyzes the mechanical performances of the short models, studying in particular the stress variation on different coils. The measured coil size was used as input in the numerical simulations, and results were then compared with the strain gauge measurements. Finally, the short models experience was used to evaluate the feasibility of a loading operation that does not rely on the strain measurements.