Magnetic Measurements and Analysis of the First 11-T Nb<sub>3</sub>Sn Dipole Models Developed at CERN for HL-LHC

Fiscarelli, Lucio; Auchmann, Bernhard; Bermúdez, Susana Izquierdo; Bordini, B.; Dunkel, O.; Karppinen, M.; Loffler, Christian; Russenschuck, Stephan; Savary, F.; Smekens, D.; Willering, Gerard

doi:10.1109/tasc.2016.2530743

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…However, some non-allowed components (a3, a4, a7 and a8) show larger ramp rate dependence. They are a factor 10 times smaller than seen in HQ01 [14] (un-cored cable), a factor 5 times smaller than in HQ02 [15] (core coverage 60 %) and a factor 2 times larger than in the CERN 11 T [16] (core coverage 90 %). When ramping stops during the stair step measurements, multipole decay of the non-allowed harmonics with a stronger dependence on the ramp rate is observed at each measurement level.…”

Section: Inter-strand Coupling Currents Effectmentioning

confidence: 75%

Magnetic Analysis of the Nb₃Sn Low-Beta Quadrupole for the High-Luminosity LHC

Bermúdez

Ambrosio

Chlachidze

et al. 2017

IEEE Trans. Appl. Supercond.

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Section: Inter-strand Coupling Currents Effectmentioning

confidence: 75%

Magnetic Analysis of the Nb₃Sn Low-Beta Quadrupole for the High-Luminosity LHC

Bermúdez

Ambrosio

Chlachidze

et al. 2017

IEEE Trans. Appl. Supercond.

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“…5). The measurements of the single aperture models MBHSP102 and MBHSP103 show different saturation behavior compared to the 2D calculation [9]. The discrepancy in the transfer function at nominal current is 70 units.…”

Section: The 11 T Dipolementioning

confidence: 83%

Influence of 3-D Effects on Field Quality in the Straight Part of Accelerator Magnets for the High-Luminosity Large Hadron Collider

Nilsson

Bermúdez

Todesco

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-A dedicated D1 beam separation dipole is currently being developed at KEK for the Large Hadron Collider Luminosity upgrade (HL-LHC). Four 150 mm aperture, 5.6 T magnetic field and 6.7 m long Nb-Ti magnets will replace resistive D1 dipoles. The development includes fabrication and testing of 2.2 m model magnets. The dipole has a single layer coil and thin spacers between coil and iron, giving a non-negligible impact of saturation on field quality at nominal field. The magnetic design of the straight section coil cross section is based on 2D optimization and a separate optimization concerns the coil ends. However, magnetic measurements of the short model showed a large difference (tens of units) between the sextupole harmonic in the straight part and the 2D calculation. This difference is correctly modelled only by a 3D analysis: 3D calculations show that the magnetic field quality in the straight part is influenced by the coil ends, even for the 6.7 m long magnets. The effect is even more remarkable in the short model. We investigate similar 3D effects for other magnets, namely the 11 T dipole for HL-LHC. We also consider the case of the 4.5 T recombination magnets for HL-LHC (D2), where the larger space between coil and iron makes this effect less important, but still visible. We conclude the paper by outlining the different classes of accelerator magnets where this coupling between 3D effects and iron saturation can be relevant. Index Terms-Superconducting magnets, accelerator magnets, magnetic analysis.

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“…Comprehensive magnetic measurements were carried out to determine the MBH transfer function (TF) and the field harmonics produced by the coil geometry, persistent currents, iron saturation, and magnetic cross-talk between apertures (Fiscarelli et al 2016(Fiscarelli et al , 2017. The measurements were performed using the CERN Fast Measurement Equipment (FAME) system.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Nb3Sn 11 T Dipole for the High Luminosity LHC (CERN)

Bordini

Bottura

Devred

et al. 2019

Nb3Sn Accelerator Magnets

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This chapter describes the design of, and parameters for, the 11 T dipole developed at the European Organization for Nuclear Research (CERN) for the High Luminosity Large Hadron Collider (HL-LHC) project. The results for testing the short models as well as the first 5 m long magnet are also presented. Finally, the production process for the six units, of which four are to be installed in the HL-LHC, is described, with a description of the process for planning the installation. In 2020, these dipoles should be the first Nb 3 Sn magnets working in an accelerator.

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Magnetic Measurements and Analysis of the First 11-T Nb₃Sn Dipole Models Developed at CERN for HL-LHC

Cited by 17 publications

References 10 publications

Magnetic Analysis of the Nb₃Sn Low-Beta Quadrupole for the High-Luminosity LHC

Magnetic Analysis of the Nb₃Sn Low-Beta Quadrupole for the High-Luminosity LHC

Influence of 3-D Effects on Field Quality in the Straight Part of Accelerator Magnets for the High-Luminosity Large Hadron Collider

Nb3Sn 11 T Dipole for the High Luminosity LHC (CERN)

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Magnetic Measurements and Analysis of the First 11-T Nb3Sn Dipole Models Developed at CERN for HL-LHC

Cited by 17 publications

References 10 publications

Magnetic Analysis of the Nb3Sn Low-Beta Quadrupole for the High-Luminosity LHC

Magnetic Analysis of the Nb3Sn Low-Beta Quadrupole for the High-Luminosity LHC

Influence of 3-D Effects on Field Quality in the Straight Part of Accelerator Magnets for the High-Luminosity Large Hadron Collider

Nb3Sn 11 T Dipole for the High Luminosity LHC (CERN)

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Product

Resources

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Magnetic Measurements and Analysis of the First 11-T Nb₃Sn Dipole Models Developed at CERN for HL-LHC

Magnetic Analysis of the Nb₃Sn Low-Beta Quadrupole for the High-Luminosity LHC

Magnetic Analysis of the Nb₃Sn Low-Beta Quadrupole for the High-Luminosity LHC