Development of a Nb/sub 3/Sn quadrupole magnet model

Self Cite

The LHC magnet R&D program has shown that the limit of NbTi technology at 1.9 K was in the 10-to-10.5-T range. Hence, to go beyond the 10-T threshold, it is necessary to change the superconducting material. Given the state of the art in HTS, the only serious candidate is Nb 3 Sn. A series of dipole magnet models built at Twente University and LBNL as well as a vigorous program carried out at Fermilab have demonstrated the feasibility of Nb 3 Sn magnet technology. The next step is to bring this technology to maturity, which require further conductor and conductor insulation development and a simplification of manufacturing processes. After a brief history, we review ongoing R&D programs in Europe and we present the Next European Dipole (NED) initiative promoted by the European Steering Group on Accelerator R&D (ESGARD). Index Terms-Accelerator magnets, LHC upgrade, Nb 3 Sn superconductor. I. INTRODUCTION T HE CERN/LHC superconducting magnet R&D program was successful in developing a design suitable for industrial production [1], but it demonstrated also that the limit of accelerator magnets wound from binary NbTi conductors and operated in superfluid helium at 1.9 K lied in the 10-to-10.5-T range. Presently, the best performing (binary) NbTi dipole magnets are: (1) a 1-m-long, 50-mm-twin-aperture LHC model, referred to as MFISC [2]; and (2) a 1-m-long, 88-mm-single-aperture model, referred as MFRESCA [3]. MFISC was designed by a team led by D. Leroy in collaboration with the Helsinki University of Technology. It was built and cold tested at CERN and reached (in a few quenches) a record magnetic flux density of 10.53 T at 1.77 K. MFRESCA was designed also by a team led by D. Leroy, but was built by HMA Power Systems in the Netherlands. It is now implemented in the CERN cable test facility and is operated routinely up to 10 T (note that, at this field level, the Lorentz forces developed in the MFRESCA coils are about twice those developed in regular LHC dipole magnet coils Manuscript

Section: B Magnet Randd 1) At Twente Universitymentioning

confidence: 99%

High Field Accelerator Magnet R&D in Europe

Devred

Baynham²,

Bottura³

et al. 2004

Self Cite

“…A Nb Sn quadrupole magnet is being fabricated at CEA-Saclay, with parameters suitable for application in the final focus of the TESLA collider [50]. Nominal field gradient is 211 T/m in a 56 mm aperture.…”

Section: A Shell-type Dipoles and Quadrupolesmentioning

confidence: 99%

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

Sabbi

2002

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.

“…They are currently applying this technology to the development of high gradient quadrupoles [13]. The model magnets are based on the design of the LHC arc quadrupoles.…”

Section: ) Cea/saclay 2) Cea/saclaymentioning

confidence: 99%

“…The 56 mm bore magnet is expected to have a gradient of The Saclay group has been involved with Nb 3 Sn for some time. They are currently applying this technology to the development of high gradient quadrupoles [13]. The model magnets are based on the design of the LHC arc quadrupoles.…”

Section: ) Cea/saclay 2) Cea/saclaymentioning

confidence: 99%

Post-LHC accelerator magnets

Gourlay

2002

Abstract-The design and practicality of future accelerators, such as hadron colliders and neutrino factories being considered to supercede the LHC, will depend greatly on the choice of superconducting magnets. Various possibilities will be reviewed and discussed, taking into account recent progress and projected improvements in magnet design and conductor development along with the recommendations from the 2001 Snowmass workshop.