Field Quality and Mechanical Analysis of the Beam Separation Dipole for HL-LHC Upgrade

Sugano, M.; Nakamoto, T.; Xu, Qingjin; Kawamata, Hiroshi; Todesco, E.

doi:10.1109/tasc.2014.2364231

Cited by 18 publications

(16 citation statements)

References 2 publications

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“…Nevertheless, other applications are currently under investigation, such as for example high current cables (see e.g. the link project at CERN [4]), fault current limiters, transformers, motors and generators [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity and stability of commercial MgB₂conductors

Bonura¹,

Senatore²

2015

Supercond. Sci. Technol.

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This paper presents a study of the thermal transport properties of MgB 2 tapes differing in architecture, stabilization and constituent materials. The temperature and field dependence of thermal conductivity, κ(T, B), was investigated both along the conductor and in the direction perpendicular to the tape. These data provide fundamental input parameters to describe the 3D heat diffusion process in a winding. Thermal transport properties -even in field -are typically deduced using semi-empirical formulas based on the residual resistivity ratio of the stabilizer measured in absence of magnetic field. The accuracy of these procedures was evaluated comparing the calculated κ values with the measured ones. Based on the experimental thermal conduction properties κ(T, B) and critical current surface J C (T, B) we determined the dependence of minimum quench energy and normal zone propagation velocity on the operating parameters of the conductor. The correlation between thermal properties and tape layout allowed us to provide information on how to optimize the thermal stability of MgB 2 conductors.

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Section: Introductionmentioning

confidence: 99%

Thermal conductivity and stability of commercial MgB₂conductors

Bonura¹,

Senatore²

2015

Supercond. Sci. Technol.

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“…The coil pre-stress at the pole at assembly is designed to be 80 MPa so that the coil is under compression at the pole even during excitation. The performed ANSYS simulations [6], [7] have not revealed any serious problem in the magnet structure.…”

Section: B Magnet Designmentioning

confidence: 99%

“…In this paper, development status of the short model as well as advancement of the fundamental design studies are presented. Detailed electromagnetic and mechanical analyses are reported in [7].…”

Section: Introductionmentioning

confidence: 99%

Model Magnet Development of D1 Beam Separation Dipole for the HL-LHC Upgrade

Nakamoto

Sugano

et al. 2015

IEEE Trans. Appl. Supercond.

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KEK has been conducting the design study of the beam separation dipole magnet, D1, for the High Luminosity LHC (HL-LHC) upgrade within a framework of the CERN-KEK collaboration. The D1 magnet has a coil aperture of 150 mm using Nb-Ti superconducting cable and the nominal dipole field of 5.6 T can be generated at 12 kA and 1.9 K. A field integral of 35 T·m is required. The development of the 2-m-long model magnet has been started since May 2013. This paper describes the development status of the short model magnet as well as advancement of the fundamental design studies.

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“…Requirements on the magnetic field are extremely high as field errors can be detrimental for the beam dynamics. As a first approach the magnetic design of superconducting accelerator magnets is usually based on numerical optimization by 2D modelling of the cross section in the transverse plane [1]. Once the cross section is designed, the coil ends are optimized separately with the objective to minimize the total field errors Automatically generated dates of receipt and acceptance will be placed here.…”

Section: Introductionmentioning

confidence: 99%

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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Field Quality and Mechanical Analysis of the Beam Separation Dipole for HL-LHC Upgrade

Cited by 18 publications

References 2 publications

Thermal conductivity and stability of commercial MgB₂conductors

Thermal conductivity and stability of commercial MgB₂conductors

Model Magnet Development of D1 Beam Separation Dipole for the HL-LHC Upgrade

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

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Field Quality and Mechanical Analysis of the Beam Separation Dipole for HL-LHC Upgrade

Cited by 18 publications

References 2 publications

Thermal conductivity and stability of commercial MgB2conductors

Thermal conductivity and stability of commercial MgB2conductors

Model Magnet Development of D1 Beam Separation Dipole for the HL-LHC Upgrade

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

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Product

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Thermal conductivity and stability of commercial MgB₂conductors

Thermal conductivity and stability of commercial MgB₂conductors