Insulation Systems for NB3SN Accelerator Magnet Coils Fabricated by the “Wind and React” Technique

Devred, A.; Brédy, P.; Durante, M.; Gourdin, C.; Rey, Jean‐Michel; Reytier, Magali

doi:10.1007/978-1-4615-4293-3_18

Cited by 11 publications

(12 citation statements)

References 3 publications

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“…A typical approach is to remove the sizing by heating the glass tape to 350-450C in air before winding the cable [3,6]. The effect of removing the sizing is to leave the glass fibre vulnerable to damage during winding.…”

Section: Desizingmentioning

confidence: 99%

Insulation Development for the Next European Dipole

Canfer¹,

Baynham²,

Greenhalgh³

2006

AIP Conference Proceedings

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Electrical insulation is one of the most challenging issues governing the engineering exploitation of niobium-tin conductors. This is especially true for future accelerator magnets manufactured by the "wind-and-react" route. Applications such as the LHC Interaction Region upgrade or in the longer term an LHC energy upgrade will require magnets to operate at high fields in demanding thermal and radiation environments. The Next European Dipole (NED) programme is aimed at the development of a large aperture (up to 88mm) high field (up to 15T conductor peak field) superconducting dipole magnet relying on niobium-tin conductors. Conventional insulation development is being addressed in two key areas, the engineering requirements for large scale magnet manufacture and the improvement of materials properties for magnet operation and performance. The paper will review the status of insulation technology for niobium-tin accelerator magnets and define the special requirements for NED. Particular emphasis will be placed on the development of fibre sizing technology and its influence on magnet manufacture and electrical/mechanical performance of insulation laminates. This work is supported in part by the European Community ABSTRACTElectrical insulation is one of the most challenging issues governing the engineering exploitation of niobium-tin conductors. This is especially true for future accelerator magnets manufactured by the "wind-and-react" route. Applications such as the LHC Interaction Region upgrade or in the longer term an LHC energy upgrade will require magnets to operate at high fields in demanding thermal and radiation environments. The Next European Dipole (NED) programme is aimed at the development of a large aperture (up to 88mm) high field (up to 15T conductor peak field) superconducting dipole magnet relying on niobium-tin conductors. Conventional insulation development is being addressed in two key areas, the engineering requirements for large scale magnet manufacture and the improvement of materials properties for magnet operation and performance. The paper will review the status of insulation technology for niobium-tin accelerator magnets and define the special requirements for NED. Particular emphasis will be placed on the development of fibre sizing technology and its influence on magnet manufacture and electrical/mechanical performance of insulation laminates.

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Section: Desizingmentioning

confidence: 99%

Insulation Development for the Next European Dipole

Canfer¹,

Baynham²,

Greenhalgh³

2006

AIP Conference Proceedings

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“…Superconducting dipole magnets used for accelerators provide high magnetic fields up to 15 tesla [12][13][14] .…”

Section: ) Superconducting Magnets For Particle Acceleratormentioning

confidence: 99%

“…This flexibility of reshaping the cross-section enables over-braiding of the Rutherford cable that has a relatively rectangular cross section making it a suitable alternative for fibre tape. The requirements of the fibre component of the insulation include the need to have good radiation resistance, temperature resistance of around 700ºC, reasonable cost, commercial availability and free of boron. S glass (R glass in Europe) has a higher recrystallization temperature (~750°C) than that of E glass 13 . Although E-glass is easily available commercial glass fibre, one of the constituents of the fibre is boron trioxide (B 2 O 3 ) 19 .…”

Section: ) Braiding Of Rutherford Cables A) Insulation Requirementsmentioning

confidence: 99%

Braiding ultrathin layer for insulation of superconducting Rutherford cables

Roy

Potluri

Canfer

et al. 2016

Journal of Industrial Textiles

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Over braiding of superconducting Rutherford cable was used for fibre reinforcement in the composite insulation in this research. Braiding was a suitable alternative to fabric tape winding for achieving ultrathin insulation with required electrical breakdown voltage. A brief overview of the superconducting magnets, their application and requirements of insulation has been covered in order to bridge the literature gap between braiding and the superconducting magnet field of studies. Organic size coating on the fibre leaves carbon residue during high temperature treatment of the cables and hence glass fibre was desized before braiding. Braiding difficulties with desized glass fibre and possibility of braiding using compatible size coating has been discussed. The requirement of ultrathin braided layer was achieved with sufficient surface coverage with a suitable braid angle and fibre. As part of the study braid cover factor variation on the surface of the cable was investigated and it was discussed using image analysis.

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“…The cable uses ITER-type Internal Tin strand by Alsthom/MSA, with (12 T, 4.2 K) 750 A/mm and 19 m. Extracted strand measurements show cabling degradation within 10%. Several technology studies were carried out in preparation for magnet fabrication: special insulation was developed using a thin (60 m) quartz fiber tape [51]; thermo-mechanical properties of 10-stack samples were measured to verify that coil dimension can be controlled to the required accuracy, and to provide input for the mechanical analysis; and a splicing technique using intermediate Nb Sn-NbTi connections was developed. Magnet test is planned for March 2003.…”

Section: A Shell-type Dipoles and Quadrupolesmentioning

confidence: 99%

Status of Nb/sub 3/Sn accelerator magnet R&D

Sabbi

2002

IEEE Trans. Appl. Supercond.

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Excellent mechanical and electrical properties of multifilamentary NbTi have made it the conductor of choice in superconducting accelerators starting from the Tevatron. However, the LHC operating field of 8.33 T is close to limit for NbTi technology. In order to advance to higher fields, a superconductor with higher upper critical field is needed. At present, Nb 3 Sn is the most suitable material in terms of properties, availability, and cost. In contrast to NbTi, Nb 3 Sn is brittle and strain sensitive. Magnet R&D programs are underway worldwide to develop technologies that can take advantage of Nb 3 Sn properties while coping with the associated challenges. Status and accomplishments of the different programs are reviewed in the context of the requirements of next-generation accelerator facilities and possible upgrades to present ones.

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Insulation Systems for NB3SN Accelerator Magnet Coils Fabricated by the “Wind and React” Technique

Cited by 11 publications

References 3 publications

Insulation Development for the Next European Dipole

Insulation Development for the Next European Dipole

Braiding ultrathin layer for insulation of superconducting Rutherford cables

Status of Nb/sub 3/Sn accelerator magnet R&D

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