Principles developed for the construction of the high performance, low-cost superconducting LHC corrector magnets

Ijspeert, A.; Allitt, M.; Hilaire, Amanda St.; Karppinen, M.; Mazet, J.; Perez, J. Garcia; Salminen, J.; Karmarker, M.; Puntambekar, A.

doi:10.1109/tasc.2002.1018358

Cited by 10 publications

(10 citation statements)

References 3 publications

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“…The first is a shell type design [2], [3] and the second is a "superferric" design [4], [5] where saturated iron poles form a substantial part of magnetic field in the quadrupole aperture. The second version was chosen as more promising for magnetic center stability, ease of manufacturing lower cost.…”

Section: Quadrupole Package Designmentioning

confidence: 99%

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Design and Manufacturing Main Linac Superconducting Quadrupole for ILC at Fermilab

Kashikhin

Andreev

Lamm

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-The design and manufacturing of the first model of an International Linear Collider (ILC) Main Linac superconducting quadrupole is in progress at Fermilab. The quadrupole has a 78 mm aperture, a 36 T integrated gradient, and a cold mass length of 700 mm. A superferric magnet configuration with iron poles and four racetrack coils was chosen based on magnet performance, cost, and reliability considerations. Each coil is wound using enamel insulated, 0.5 mm diameter, NbTi superconductor. The quadrupole package also includes shell type dipole steering coils. The results of the quadrupole design, including magnetic and mechanical analyses, are presented. Specific issues related to the quadrupole magnetic center stability, superconductor magnetization and mechanical stability are discussed and analyzed. The magnet quench protection system, current leads, and mounting the quadrupole inside ILC Main Linac cryomodule will also be briefly discussed.

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Section: Quadrupole Package Designmentioning

confidence: 99%

“…Several superconducting quadrupole magnet models with similar parameters [2][3][4] have been designed and built for the LHC, the TESLA Test Facility, and XFEL. The main direction of this activity was to choose a magnetic configuration, a magnet manufacturing technology and reach the required field integrated gradient.…”

Section: Introductionmentioning

confidence: 99%

Design and Manufacturing Main Linac Superconducting Quadrupole for ILC at Fermilab

Kashikhin

Andreev

Lamm

et al. 2008

IEEE Trans. Appl. Supercond.

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“…Already in the period of prototyping [3], it was noticed that the training curve could often be matched with a power function of the type I n = I 1 *n p (1) where "I" is the quench current, I 1 the current of the first quench, "n" the number of the quench in a sequence, and the exponent "p" a constant which seemed to be about 0.2. Such a power curve forms a natural choice because re-written as…”

Section: The Shape Of the Training Curvesmentioning

confidence: 99%

“…The manufacturers also train each magnet at 4.2 K to avoid that a single training magnet in the LHC would stop the operation of a whole family of magnets connected in series. The magnets have two features in common [1]: the coils are wound from enameled superconducting wires and impregnated with epoxy, and the iron laminations directly touch the coil through an insulation layer and are of "Scissor" type [2] capable of transferring the pre-stress from the external shrinking cylinders to the internal coil assembly. However, there are many important differences between the magnets (TABLE 1) such that we are comparing very different magnets, built by different manufacturers.…”

Section: Introductionmentioning

confidence: 99%

What is Common in the Training of the Large Variety of Impregnated Corrector Magnets for the LHC

Ijspeert¹,

Kate²

2004

AIP Conference Proceedings

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The Large Hadron Collider (LHC) will be equipped with about 5000 superconducting corrector magnets of 10 different types, ranging from dipoles through quadrupoles, sextupoles and octupoles to decapoles and dodecapoles. Four wires are used with 2 copper/superconductor ratios. Magnet lengths range from 0.15 m to 1.4 m. However, the magnets are all epoxy-impregnated and wound with enameled monolithic wires. The paper highlights the features that are common in the training of all these different magnets and uses that to give some clues for the possible origin of the training. ABSTRACTThe Large Hadron Collider (LHC) will be equipped with about 5000 superconducting corrector magnets of 10 different types, ranging from dipoles through quadrupoles, sextupoles and octupoles to decapoles and dodecapoles. Four wires are used with 2 copper/superconductor ratios. Magnet lengths range from 0.15 m to 1.4 m. However, the magnets are all epoxy-impregnated and wound with enameled monolithic wires. The paper highlights the features that are common in the training of all these different magnets and uses that to give some clues for the possible origin of the training.

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“…Here the variety is such that a detailed description is left to a specialized paper [8]. As spool pieces on all the main dipoles we have sextupole correctors (one per channel, electrically independent to allow different current) and octupole and decapole correctors on half of the dipoles, only.…”

Section: Corrector Magnetsmentioning

confidence: 99%

The LHC superconducting magnets

Rossi

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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The Large Hadron Collider (LHC) is under construction at CERN. Most of its 27 km underground tunnel will be filled with superconducting magnets, mainly 15 m long dipoles and 3 m long quadrupoles. The 1232 main dipole and 392 main quadrupole magnets, are complemented by a number of insertion quadrupole magnets: including 86 MQM (matching), 26 MQY (wide aperture) and 32 low-beta quadrupoles (the latter built by KEK and Fermilab). The about 6000 superconducting corrector magnets, many of them individually powered, are also very critical for the functioning of the accelerator. Using copper stabilized NbTi Rutherford cables or single strands, these superconducting magnets will operate in superfluid helium at 1.9 K. The paper reviews the main characteristics of these magnets and addresses the critical points of the design with respect to their use in such a complicated accelerator like LHC. Then the status of the production of the superconducting cable and of the magnets is given, with particular emphasis given to the QA/QC procedures taken to ensure the industrial production according to the tight requirements, and the results on the first 30 main dipoles is presented. Finally, the plan put in place to meet the LHC schedule is discussed. AbstractThe Large Hadron Collider (LHC) is under construction at CERN. Most of its 27 km underground tunnel will be filled with superconducting magnets, mainly 15 m long dipoles and 3 m long quadrupoles. The 1232 main dipole and 392 main quadrupole magnets, are complemented by a number of insertion quadrupole magnets: including 86 MQM (matching), 26 MQY (wide aperture) and 32 lowbeta quadrupoles (the latter built by KEK and Fermilab). The about 6000 superconducting corrector magnets, many of them individually powered, are also very critical for the functioning of the accelerator. Using copper stabilized NbTi Rutherford cables or single strands, these superconducting magnets will operate in superfluid helium at 1.9 K. The paper reviews the main characteristics of these magnets and addresses the critical points of the design with respect to their use in such a complicated accelerator like LHC. Then the status of the production of the superconducting cable and of the magnets is given, with particular emphasis given to the QA/QC procedures taken to ensure the industrial production according to the tight requirements, and the results on the first 30 main dipoles is presented. Finally, the plan put in place to meet the LHC schedule is discussed.

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Principles developed for the construction of the high performance, low-cost superconducting LHC corrector magnets

Cited by 10 publications

References 3 publications

Design and Manufacturing Main Linac Superconducting Quadrupole for ILC at Fermilab

Design and Manufacturing Main Linac Superconducting Quadrupole for ILC at Fermilab

What is Common in the Training of the Large Variety of Impregnated Corrector Magnets for the LHC

The LHC superconducting magnets

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