Development and study of Rutherford-type cables for high-field accelerator magnets at Fermilab

Barzi, E.; Andreev, N.; Boffo, C.; Borissov, E.; Elementi, L.; Frate, L. Del; Yamada, R.; Zlobin, A.V.

doi:10.1088/0953-2048/17/5/024

Cited by 14 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rutherford cable has played a key role in establishing NbTi accelerator magnet technology. Superconducting dipoles and quadrupoles based on this cable design were successfully used in Tevatron, HERA and the Large Hadron Collider, and new generation magnets using NbTi and Nb 3 Sn Rutherford cables are also still developed [1][2][3]. Properties of Rutherford cables based on Nb 3 Al and Bi-2212 superconductors were also reported [4,5].…”

Section: Introductionmentioning

confidence: 93%

AC losses of Rutherford MgB₂ cables made by powder-in-tube and internal magnesium diffusion processes

Kováč

Kulich

Kopera

et al. 2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Magnetization losses of Rutherford MgB 2 cables of different sheath materials (Cu, CuNi and Al+Al 2 O 3 ) made by powder-in-tube and internal magnesium diffusion processes were studied experimentally. Short cable samples consisting of 12 strands were measured in the temperature range from 18 K up to 40 K, external fields up to 70 mT and frequencies 72 Hz and 144 Hz. The effects of inter-strand resistance by soldering and external field orientation (perpendicular and parallel) were also tested. The impact of eddy current losses in the sheath material was determined by the loss measurement in cable samples without MgB 2 . It was found that very high eddy current losses of Cu sheathed strands overlap the hysteresis loss. The lowest AC losses at 20 K were measured for a Rutherford MgB 2 cable with an Al+Al 2 O 3 sheath, which makes it attractive for applications where low loss and also low coil mass are required (e.g. wind turbines or airborne engines).

show abstract

Section: Introductionmentioning

confidence: 93%

AC losses of Rutherford MgB₂ cables made by powder-in-tube and internal magnesium diffusion processes

Kováč

Kulich

Kopera

et al. 2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The samples are then heat treated to form the Nb 3 Sn composite. Analysis at the SEM show that, after the heat treatment, the cable strands are coated with a thin layer of a material with a high content of oxygen and silica [11]. The effect of this coating on the contact resistance between the strands is under investigation at Fermilab.…”

Section: Lj01mentioning

confidence: 99%

Thermo-mechanical characterization of insulated and epoxy-impregnated Nb/sub 3/Sn composites

Imbasciati

Volpini²,

Ambrosio³

et al. 2003

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Nb 3 Sn is, at present, the best superconductor for high field accelerator magnets. Several models using Nb 3 Sn are under development in many laboratories. Knowledge of the thermo-mechanical properties of the impregnated coils is of crucial importance for the design of these magnets. In fact, the performance of epoxy-impregnated coils is sensitive to the thermal conductivity value, especially in case of heating caused by hysteretic losses, which are usually relevant in Nb 3 Sn magnets, and in the case of continuous heat deposition, such as in magnets near the interaction region of a collider. Thermal contraction measurements are necessary to estimate the stresses during the magnet thermal cycle. Different insulation materials have been studied at Fermilab utilizing various design approaches and fabrication methods. Thermal conductivity and thermal contraction measurements, at cryogenic temperatures, have been performed respectively at INFN-LASA and Fermilab. The results are reported and discussed in this paper.

show abstract

“…Later on, the interest in Rutherford cables was extended to other superconducting materials and applications. In this way, cables that allows higher operating magnetic fields and/or temperatures, based on Nb 3 Sn [2,3], Bi 2 Sr 2 CaCu 2 O 8+x [4,5,6], and more recently MgB 2 [7,8] and coated conductors [9], have already been developed. Certainly, the specific mechanical, chemical and physical characteristics of the superconducting wires or tapes used for cabling create particular challenges and impose different cabling strategies.…”

Section: Introductionmentioning

confidence: 99%

“…Rutherford-type cables based on low temperature superconductors (LTS) NbTi and Nb 3 Sn, have been widely used in the past several years to build magnets for high-energy physics [1,2]. Compared to monolithic conductors, these cables have high strand packing and fully transposed current paths, which allows a substantial increase of current capability together with a reduction of AC losses.…”

Section: Introductionmentioning

confidence: 99%

Quench dynamics in MgB₂Rutherford cables

Cubero

Navarro

Kòváč

et al. 2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The generation and propagation of quench induced by a local heat disturbance or by overcurrents in MgB 2 Rutherford cables have been studied experimentally. The analysed cable is composed of 12 strands of monocore MgB 2 /Nb/Cu10Ni wire and has a transposition length of about 27 mm. Measurements of intra-and inter-strand voltages have been performed to analyse the superconducting-to-normal transition behaviour of these cables during quench. In case of external hot-spots, two different time-dynamic regimes have been observed, a slow stage for the formation of the minimum propagation zone (MPZ), and a fast dynamics once the quench is triggered and propagates to the rest of the cable. Significant local variations of the quench propagation velocity across the strands around the MPZ have been observed, but with average quench propagation velocities closely correlated with the predictions given by one-dimensionalgeometry models. For quench induced by overcurrents (i.e. with applied currents higher than the critical current) the nucleation of many normal zones distributed within the cable, which overlap during quench propagation, gives a distinctive and faster quench dynamics.

show abstract

Development and study of Rutherford-type cables for high-field accelerator magnets at Fermilab

Cited by 14 publications

References 5 publications

AC losses of Rutherford MgB₂ cables made by powder-in-tube and internal magnesium diffusion processes

AC losses of Rutherford MgB₂ cables made by powder-in-tube and internal magnesium diffusion processes

Thermo-mechanical characterization of insulated and epoxy-impregnated Nb/sub 3/Sn composites

Quench dynamics in MgB₂Rutherford cables

Contact Info

Product

Resources

About

Development and study of Rutherford-type cables for high-field accelerator magnets at Fermilab

Cited by 14 publications

References 5 publications

AC losses of Rutherford MgB2 cables made by powder-in-tube and internal magnesium diffusion processes

AC losses of Rutherford MgB2 cables made by powder-in-tube and internal magnesium diffusion processes

Thermo-mechanical characterization of insulated and epoxy-impregnated Nb/sub 3/Sn composites

Quench dynamics in MgB2Rutherford cables

Contact Info

Product

Resources

About

AC losses of Rutherford MgB₂ cables made by powder-in-tube and internal magnesium diffusion processes

AC losses of Rutherford MgB₂ cables made by powder-in-tube and internal magnesium diffusion processes

Quench dynamics in MgB₂Rutherford cables