Summary of Test Results of MQXFS1—The First Short Model 150 mm Aperture Nb3Sn Quadrupole for the High-Luminosity LHC Upgrade

Bajas

et al. 2018

Self Cite

Abstract-CERN and US LARP (LHC Accelerator Research Program) are jointly developing Nb3Sn quadrupole magnets to be installed in the LHC for its upgrade to higher luminosity. These magnets' quench protection system will include a combination of quench heaters attached to the coil surfaces and CLIQ units electrically connected to the magnets. Different protection elements have been characterized separately and simultaneously by implementing them on two 1.2 meter long model quadrupole magnets, tested at FNAL and CERN, and one 4.0 meter long mirror magnet tested at BNL. After analyzing the test data, their performances have been positively evaluated. Furthermore, the electro-thermal transients occurring after a quench have been simulated with the LEDET software and the results compared to experimental results. The preferred quench protection system configuration relies both on heaters and CLIQ. This solution is based on electrically robust components, achieves an effective reduction of the coils hot-spot temperature after a quench, and offers increased redundancy against component failures.

Section: A Heatersmentioning

confidence: 99%

“…2. Measured heater delay as a function of the magnet current [25]- [30]. Tests were performed with the parameters summarized in Table III.…”

Section: A Heatersmentioning

confidence: 99%

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Quench Protection Performance Measurements in the First MQXF Magnet Models

Ravaioli

Bajas

et al. 2018

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“…1, and will produce an ultimate gradient of 143.2 T/m in a 150 mm aperture, when powered at 17.89 kA. The design was tested in four short models [4]: the MQXFS1 [5], [6], MQXFS5 [7] and MQXFS4 [8] magnets successfully reached the ultimate current, while MQXFS3 [7] did not.…”

Section: Introductionmentioning

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

Anderssen

et al. 2019

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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.

“…Among others, several short prototypes with a magnetic length of 1 m were designed [2,3]. An extensive testing campaign at FNAL for MQXFS1, the first prototype, was conducted to ensure it matches performance expectations [4][5][6][7][8]. Three different test cycles with varying axial and azimuthal pre-stress were conducted, testing new quench protection as well as quench training and memory and field quality studies.…”

Section: Introductionmentioning

confidence: 99%

Quench Location in the LARP MQXFS1 Prototype

Strauss

Chlachidze

et al. 2018

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Abstract-The high luminosity upgrade project US LARP/HiLumi has successfully tested the first 1.5 m prototype quadrupole MQXFS1 at Fermilab' Magnet test facility. Several thermal cycles and test programs were performed, with different pre-load configurations. To localize and characterize quenches a quench antenna and voltage taps are used. The quench antenna was placed inside a warm bore of an anti-cryostat centered in the magnet. We varied the length between quench antenna segments from 1" to 6", and shifted the location of the antenna to localize the quench origin along the various wedge and spacers transitions in the lead end of the magnet. We present results on the identified quench locations for the second and third thermal cycle in this paper.