Superconducting Magnets for Particle Accelerators and Storage Rings

Devred, A.

doi:10.1002/047134608x.w1320

Cited by 11 publications

(15 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here the index κ = ±1 separates the space into the conditions 0 < r j < r i for κ = 1, a condition that is useful for beam optics computations in the case of accelerator magnets 49 , and the condition r j > r i with κ = −1 which results useful for magnetic computations 50 . Then, the key instrument is to expand the function ln (r i j ) = ln (r i ) + ln (1 − s/r i ) into a Taylor's series that with the help of De Moivre's Formula allows to rewrite Eq.…”

Section: Multipole Expansion Of the Critical State Model In Sc-sfm Romentioning

confidence: 99%

“…Nevertheless, inspired by the pioneer research of Arnaud Devred at CERN on the determination of the magnetic field produced by accelerator magnets [49][50][51][52] , and the variational principles of the critical state theory originally introduced by A. Badía and C. López 53,54 , which have been extensively used to demonstrate the occurrence of intriguing phenomena in type-II SC rounded wires by Ruiz et. al.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Why energy lossless ferromagnetic materials can add energy losses onto type-II superconductors?

Fareed

2021

Preprint

View full text Add to dashboard Cite

Understanding the physical coupling between the macroscopic electromagnetic properties of type II superconductors (SC) and soft ferromagnetic materials (SFM), is root for progressing onto the application of SC-SFM metastructures in scenarios such as magnetic cloaking, magnetic shielding, and loss free current transmission systems. However, in the latter case understanding the origin of the rise in the hysteresis losses of the superconductor by effect of the coupling with the SFM has historically resulted in a notable challenge, it because this rise in the AC losses is simply counterintuitive due to the fact that the SFM itself does not add magnetization losses to the system and furthermore, there is no evidence of electrical current sharing between these two materials. Thus, aimed to resolve this long-standing problem, in this paper, we present a semi-analytical model for monocore SC-SFM heterostructures of cylindrical cross-section and self-field conditions, showing the first known map of AC-losses for SC-SFM magnetically shielded wires, with magnetic relative permeabilities for the SFM ranging from mur=5 (NiZn ferrites) to mur =350000 (pure Iron). The distribution of current density and magnetic field inside the SC-SFM metastructure is shown in great detail, revealing a remarkable agreement with the intriguing magneto optical imaging observations that were originally questioning the validness of the critical state theory. In this sense, we have extended the critical state theory within its variational formalism, incorporating a multipole functional approach which allows the direct finding of the coupling terms between a SC current and a SFM sheath, proving that all reported phenomena for the self-filed hysteretic behavior of SC-SFM heterostructures can be understood within the classical critical state model without the need to recur to the ansatz of overcritical currents.

show abstract

Section: Multipole Expansion Of the Critical State Model In Sc-sfm Romentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Why energy lossless ferromagnetic materials can add energy losses onto type-II superconductors?

Fareed

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The largest of the geometrical harmonics, minimized at that gradient, was b 18 =-0.42 units, at the reference radius of 40 mm. The superconductor properties were parameterized according to [8]- [9] with the reference parameters listed in TABLE 1. The Nb 3 Sn magnet has an ample operating margin at 1.9 K or 4.5 K, while the NbTi version requires operation at 1.9 K. …”

Section: Magnetic Designmentioning

confidence: 99%

PERFORMANCE OF NB[sub 3]SN QUADRUPOLE MAGNETS UNDER LOCALIZED THERMAL LOAD

Kashikhin¹,

Bossert²,

Chlachidze³

et al. 2010

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Accelerator magnets and their characteristics have been described and discussed elsewhere [4], [10]- [15] and a description of the final features of the LHC main magnets can be found in [5], [16]. For the scope of the present paper is sufficient to recall a few of the main characteristics.…”

Section: Magnet Characteristicsmentioning

confidence: 99%

Superconducting Magnets for the LHC Main Lattice

Rossi

2004

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-The main lattice of the Large Hadron Collider (LHC) will employ about 1600 main magnets and more than 4000 corrector magnets. All superconducting and working in pressurized superfluid helium bath, these impressive line of magnets will fill more than 20 km of the underground tunnel. With almost 70 main dipoles already delivered and 10 main quadrupoles almost completed, we passed the 5% of the production and now all manufacturers have fully entered into series production. In this paper the most critical issues encountered in the ramping up in such a real large scale fabrication will be addressed: uniformity of the coil size and of prestress, special welding technique, tolerances on curvature (dipoles) or straightness (quadrupoles) and of the cold mass extremities, harmonic content and, most important, the integrated field uniformity among magnets. The actual limits and the solution for improvements will be discussed. Finally a realistic schedule based on actual achievements is presented.

show abstract

Superconducting Magnets for Particle Accelerators and Storage Rings

Abstract: The sections in this article are Types of Particle Accelerator Particle Accelerators and Superconductivity Conductor and Conductor Insulation Magnetic Design Field Quality Mechanical Design Magnet Cooling Quench Performance … Show more

Cited by 11 publications

References 60 publications

Why energy lossless ferromagnetic materials can add energy losses onto type-II superconductors?

Why energy lossless ferromagnetic materials can add energy losses onto type-II superconductors?

PERFORMANCE OF NB[sub 3]SN QUADRUPOLE MAGNETS UNDER LOCALIZED THERMAL LOAD

Superconducting Magnets for the LHC Main Lattice

Contact Info

Product

Resources

About