Conveners
Magnets: Nb3Sn wire R&D
- Amalia Ballarino (CERN)
Magnets: Nb3Sn and other SC materials R&D
- Carmine Senatore (University of Geneva)
Magnets: High-field magnet R&D
- Fernando Toral (Centro de Investigaciones Energéti cas Medioambientales y Tecno)
Internal oxidation technique could generate nano oxide particles in Nb3Sn strands, which could significantly refine the Nb3Sn grain size and boost the high-field critical current density. Our recent APC (Artificial Pinning Center) Nb3Sn wires with Ta and Zr doping demonstrated substantial grain refinement and significantly increased Jc,nonCu, while retaining the high Bc2 values of the best...
In order to develop superconducting wires meeting the requirements for the 16 T dipole magnets proposed for FCC-hh, CERN is coordinating a conductor development programme, now involving 6 manufacturers and 6 academic partners.
A key goal of the programme is to develop Nb$_3$Sn wires with a non-copper critical current density ($J_c$) of 1500 A mm$^{-2}$ at 16 T and 4.2 K, and to demonstrate...
KAT have manufactured various kinds of wires to achieve an FCC requirement during last two years. As a result, it succeeded in developing a wire having a critical current density of 1,070 A/mm2@16T and an effective diameter of 69 micrometers with short piece length. Recently, our research has been successfully conducted to secure a piece length of 100 m or more. Totally 6 km of strand has been...
CERN, KEK and Tohoku & Tokai university have jointly launched a R&D program.The scope of the program is to develop, produce in representative lengths and characterize Nb3Sn wire with enhanced characteristics. The final goal is to achieve in representative unit lengths of material the development targets defined, on the basis of magnets performance, for the FCC Nb3Sn conductor. Two Japanese...
CERN and BRUKER have been longstanding, historic partners in the development, manufacture and support of today’s materials for accelerator magnets. With the Future Circular Collider on the horizon, both companies decided to build on their partnership and extend their collaboration in order to ready today’s state of the art A-15 Materials for the requirements of future accelerator magnets. As...
The Vienna University of Technology (TU Wien) is supporting the FCC wire development program by advanced characterization techniques of the superconducting properties of prototype wires and microstructural analysis. The aim of the work is to deepen the understanding of the relationship between the local superconducting properties, the underlying microstructure, and the resulting macroscopic...
Progress in development and processing of HTS-coated conductors is presented regarding general trends and particular cases of the double-disordered YBCO conductors. These coated tapes with a length of 400-600 m show already a very high in-field critical current density, up to 1000 A/mm2 at 20 T, B//c, 4.2 K. Potential for further gaining of critical currents and current density is discussed...
Iron-based superconductors (IBS) since their discovery appeared very promising for applications at 4.2K and high fields. Two technologies are advancing towards realistic applications, namely Powder-In-Tube (PIT) and Coated Conductors (CCs). PIT tapes of the 122 family attained critical current densities Jc of 105A/cm2 at 15T with hot pressing, while CCs on commercially available IBAD and...
Bi-2212 round wire made by powder-in-tube technique has emerged as a very promising conductor for high field NMR and accelerator magnets because it is can be made in multiple multifilament architectures and in the twisted state that benefits low hysteretic losses, isotropic properties, and high magnetic field quality. Bi-2212 powder is now available from two US companies, MetaMateria and...
U.S. Magnet Development Program (US-MDP) has developed a Nb3Sn dipole demonstrator for a post-LHC pp Collider. The magnet has 60-mm aperture, 4-layer shell-type graded coils, and cold iron yoke. The cable in the two inner layers has 28 strands 1.0 mm in diameter and the cable in the two outer layers has 40 strands 0.7 mm in diameter. Both cables are using RRP Nb3Sn wires produced by...
F2D2, the FCC Flared-ends Dipole Demonstrator, is a 15 T single-aperture short model being developed within a collaboration between CEA Paris-Saclay and CERN. The magnet will be fabricated at CEA and then tested at CERN. The design phase is ongoing at CEA and we will report on its status. The 2D magnetic and mechanical designs have been optimized and allowed defining the operating points and...
The concept of new fast cycled low loss 6 T model dipole cooling at 1.9 K is proposed. The magnet is considered in the context of the FCC-hh high energy injector based on the modernized CERN SPS synchrotron. The new machine would operate in a cycled mode also to feed experimental areas, much like the SPS nowadays. Due to this specific cycled operation, innovative design and development...
