Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade

Vallone, Giorgio; Ambrosio, G.; Bourcey, Nicolas; Anderssen, E.; Cheng, D.; Ferracin, P.; Grosclaude, Philippe; Guinchard, Michael; Bermúdez, Susana Izquierdo; Juchno, M.; Lackner, F.; Pan, Heng; Pérez, Juan Carlos; Prestemon, S.

doi:10.1109/tasc.2017.2778064

Cited by 15 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, a longer magnet will reduce the longitudinal stiffness of the coil. However, the numerical results presented in [14] suggest that, even if the total coil elongation scales with the magnet length, the contact pressure between the coil and the pole/spacers in the end regions should not be subject to major changes. This paper summarizes the assembly results of a MQXFB mechanical model, built at CERN using coils without full performance, in order to verify the assembly procedures, test the mechanical soundness of the first MQXFB structure, and verify if an acceptable preload condition could be reached.…”

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

Assembly of a Mechanical Model of MQXFB, the 7.2-m-Long Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole for the High-Luminosity LHC Upgrade

Vallone

Ambrosio

Anderssen

et al. 2019

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

The Nb 3 Sn low-β quadrupole MQXF is being developed as a part of the High-Luminosity LHC upgrade project. The magnet will be produced in two different configurations, sharing the same cross-section but with different lengths. A 7.2 m mechanical model of MQXFB was recently assembled at CERN with one copper coil, two low-grade coils and one rejected coil. Coil dimensions were measured with a portable Coordinate Measurement Machine. The coil pack shimming was designed in order to optimize the field quality and the contacts between the coils and the collars. The azimuthal preload target was defined using the short models experience. The mechanical behavior during loading was monitored by means of strain gauges. The results demonstrated that the structure can provide the required prestress to the coils.

show abstract

Section: Introductionmentioning

confidence: 94%

“…The loading operation was performed inserting keys of increasing thickness inside the structure. In [14], the target prestress for the MQXFB magnets was defined to be, after cooldown, equal to 150 MPa. This prestress is in fact the one that would avoid any pole unloading up to the ultimate current.…”

Section: Support Structure Assembly and Preloadmentioning

confidence: 99%

Assembly of a Mechanical Model of MQXFB, the 7.2-m-Long Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole for the High-Luminosity LHC Upgrade

Vallone

Ambrosio

Anderssen

et al. 2019

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A 2D magnetic analysis is performed to determine the coil locations within the four quadrants to minimize the un-allowed harmonics. Then, the assembly of the MQXF structure, described in detailed in [18]- [21] and showed in Fig. 6, and its pre-load with water pressurized bladders are carried out.…”

Section: Magnet Assembly and Loadingmentioning

confidence: 99%

Erratum to “The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes” [Aug 19 Art. no. 4001309]

Ferracin

Ambrosio

Anerella

et al. 2020

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Among the components to be upgraded in LHC interaction regions for the HiLumi-LHC projects are the inner triplet (or low-β) quadrupole magnets, denoted as Q1, Q2a, Q2b, and Q3. The new quadrupole magnets, called MQXF, are based on Nb3Sn superconducting magnet technology and operate at a gradient of 132.6 T/m with a conductor peak field of 11.4 T. The Q1 and Q3 are composed by magnets (called MQXFA) fabricated by the US Accelerator Upgrade Project (AUP) with a magnetic length of 4.2 m. The Q2a and Q2b consists of magnets (called MQXFB) fabricated by CERN with a magnetic length of 7.15 m. After a series of short models, constructed in close collaboration by the US and CERN, the development program is now entering in the prototyping phase, with CERN on one side and BNL, FNAL, and LBNL on the other side assembling and testing their first long magnets. We provide in this paper a description of the status of the MQXF program, with a summary of the short model test results, including quench performance, and mechanics, and an update on the fabrication, assembly and test of the long prototypes.

show abstract

“…As an example, the 11 Tesla dipole [12] coil length increases during RHT, despite the fact that the unconfined 11 Tesla dipole RRP Rutherford cable length decreases by about 0.3% [11], and the unconfined RRP wire length is barely affected by RHT [10,11]. In contrast, the length of the new LHC inner triplet quadrupole (MQXFB) magnet [13] coils made of Rutherford cable with a similar RRP wire is decreased after RHT. This illustrates that in order to predict the coil volume changes, a deeper understanding is required of the mechanisms of conductor volume changes, and of the effect of the thermomechanical behavior of the mould and other coil constituents, and of the friction coefficients between the various pairs of materials during RHT. Previously we reported the thermomechanical properties of the 11 Tesla dipole magnet constituent materials [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb₃Sn superconducting wires

Scheuerlein

Andrieux

Michels

et al. 2020

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Accelerator magnets that can reach magnetic fields well beyond the Nb-Ti performance limits are presently being built and developed, using Nb3Sn superconductors. This technology requires reaction heat treatment (RHT) of the magnet coils, during which Nb3Sn is formed from its ductile precursor materials (a “wind and react” approach). The Nb3Sn microstructure and microchemistry are strongly influenced by the conductor fabrication route, and by the phase changes during RHT. By combining in situ differential scanning calorimetry, high energy synchrotron x-ray diffraction, and micro-tomography experiments, we have acquired a unique data set that describes in great detail the phase and microstructure changes that take place during the processing of restacked rod process (RRP), powder-in-tube (PIT), and internal tin (IT) Nb3Sn wires. At temperatures below 450 °C the phase evolutions in the three wire types are similar, with respectively solid state interdiffusion of Cu and Sn, Cu6Sn5 formation, and Cu6Sn5 peritectic transformation. Distinct differences in phase evolutions in the wires are found when temperatures exceed 450 °C. The volume changes of the conductor during RHT are a difficulty in the production of Nb3Sn accelerator magnets. We compare the wire diameter changes measured in situ by dilatometry with the phase and void volume evolution of the three types of Nb3Sn wire. Unlike the Nb3Sn wire length changes, the wire diameter evolution is characteristic for each Nb3Sn wire type. The strongest volume increase, of about 5%, is observed in the RRP wire, where the main diameter increase occurs above 600 °C upon Nb3Sn formation.

show abstract

Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade

Cited by 15 publications

References 10 publications

Assembly of a Mechanical Model of MQXFB, the 7.2-m-Long Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole for the High-Luminosity LHC Upgrade

Assembly of a Mechanical Model of MQXFB, the 7.2-m-Long Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole for the High-Luminosity LHC Upgrade

Erratum to “The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes” [Aug 19 Art. no. 4001309]

Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb₃Sn superconducting wires

Contact Info

Product

Resources

About

Mechanical Design Analysis of MQXFB, the 7.2-m-Long Low- $\beta$ Quadrupole for the High-Luminosity LHC Upgrade

Cited by 15 publications

References 10 publications

Assembly of a Mechanical Model of MQXFB, the 7.2-m-Long Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole for the High-Luminosity LHC Upgrade

Assembly of a Mechanical Model of MQXFB, the 7.2-m-Long Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole for the High-Luminosity LHC Upgrade

Erratum to “The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes” [Aug 19 Art. no. 4001309]

Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb3Sn superconducting wires

Contact Info

Product

Resources

About

Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb₃Sn superconducting wires