The MQXA quadrupoles for the LHC low-beta insertions

Ajima, Y.; Higashi, N.; Iida, M.; Kimura, N.; Nakamoto, T.; Ogitsu, T.; Ohhata, H.; Ohuchi, N.; Shintomi, T.; Sugawara, S.; Sugita, Kei; Tanaka, Kenichi; Taylor, T. Matthew; Terashima, A.; Tsuchiya, K.; Yamamoto, A.

doi:10.1016/j.nima.2005.04.092

Cited by 26 publications

(18 citation statements)

References 20 publications

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“…Practically, superconducting quadrupole coils for accelerator are often made of one or more layers, each one made of one or two blocks, as it is the case for instance for the LHC MQXA [5] and for the Tevatron MQ [6]. In the following we will only consider the four coil cross-sections shown in Fig.…”

Section: B Methods To Explore the Possible Coil Layoutsmentioning

confidence: 99%

A Method for Coil Design of Superconducting Quadrupoles Based on Sector Coils and Fourier Series

Borgnolutti

Todesco

Mailfert³

2010

IEEE Trans. Appl. Supercond.

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In this paper we present a novel method to optimize quadrupole coil cross-sections based on the cos2 θ-type. We first approximate real coil blocks made of cables with concentric sectors powered with a constant current density to m ake use of analytical expressions of the m agnetic field based on the Fourier series developm ent. This allows a rapid evaluation of the field harmonics which permits an almost exhaustive scan on sectors position and dim ensions for coil layouts m ade of up to five sectors. The coil layouts having a larger short-sam ple gradient can be further explored, approximating them with blocks of Rutherford cables. This second step requires a second fine tuning of the cross-section around the previously found optimum. The method has been used to design a proposed coil cross-section for the new inner triplet quadrupole for the LHC. CERN/ATS 2010-169July 2010 Abstract 2IO-03 1Abstract-In this paper we present a novel method to optimize quadrupole coil cross-sections based on the cos2θ-type. We first approximate real coil blocks made of cables with concentric sectors powered with a constant current density to make use of analytical expressions of the magnetic field based on the Fourier series development. This allows a rapid evaluation of the field harmonics which permits an almost exhaustive scan on sectors position and dimensions for coil layouts made of up to five sectors. The coil layouts having a larger short-sample gradient can be further explored, approximating them with blocks of Rutherford cables. This second step requires a second fine tuning of the cross-section around the previously found optimum. The method has been used to design a proposed coil cross-section for the new inner triplet quadrupole for the LHC.

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Section: B Methods To Explore the Possible Coil Layoutsmentioning

confidence: 99%

A Method for Coil Design of Superconducting Quadrupoles Based on Sector Coils and Fourier Series

Borgnolutti

Todesco

Mailfert³

2010

IEEE Trans. Appl. Supercond.

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“…The mechanical structure is similar to the MQXA [30], with support given by the iron yoke locked by keys. This structure has the advantage of reducing the collar size, leaving more space to iron and reducing the fringe field.…”

Section: The Separation Dipole D1mentioning

confidence: 99%

Superconducting Magnet Technology for the Upgrade

Todesco¹,

Ambrosio²,

Ferracin³

et al. 2015

The High Luminosity Large Hadron Collider

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In this section we present the magnet technology for the High Luminosity LHC. After a short review of the project targets and constraints, we discuss the main guidelines used to determine the technology, the field/gradients, the operational margins, and the choice of the current density for each type of magnet. Then we discuss the peculiar aspects of each class of magnet, with special emphasis on the triplet.

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“…In the LHC baseline [2], [3] a 'symmetric' layout is adopted, with Q1 and Q3 of equal lengths, and Q2 about twice in length as Q1. The same layout is kept for the upgrade, with longer magnets.…”

Section: Layoutsmentioning

confidence: 99%

Design Studies for the Low-Beta Quadrupoles for the LHC Luminosity Upgrade

Todesco

Allain

Ambrosio

et al. 2013

IEEE Trans. Appl. Supercond.

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In this paper we outline the present status of the design studies for the high luminosity LHC, focusing on the choice of the aperture of the inner triplet quadrupoles. After reviewing some critical aspects of the design as energy deposition, shielding, heat load and protection, we present the main tentative parameters for building a 150 mm aperture Nb 3 Sn quadrupole, based on the experience gathered by the LARP program in the past several years.Presented at the Applied Superconductivity Conference 2012 (ASC 2012) 7-12 October 2012, Portland, OregonGeneva, Switzerland CERN-ATS-2013-018January 2013 > REPLACE THESE LINES WITH YOUR PAPER ID NUMBER, E.G., AB-02 (DOUBLE-CLICK HERE) < Abstract-In this paper we outline the present status of the design studies for the high luminosity LHC, focusing on the choice of the aperture of the inner triplet quadrupoles. After reviewing some critical aspects of the design as energy deposition, shielding, heat load and protection, we present the main tentative parameters for building a 150 mm aperture Nb 3 Sn quadrupole, based on the experience gathered by the LARP program in the past several years.

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The MQXA quadrupoles for the LHC low-beta insertions

Cited by 26 publications

References 20 publications

A Method for Coil Design of Superconducting Quadrupoles Based on Sector Coils and Fourier Series

A Method for Coil Design of Superconducting Quadrupoles Based on Sector Coils and Fourier Series

Superconducting Magnet Technology for the Upgrade

Design Studies for the Low-Beta Quadrupoles for the LHC Luminosity Upgrade

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