Archives: Schedule

Post Type Description

Status and Perspectives in High Field Superconducting Magnets for Particle Accelerators

ABSTRACT: Superconducting magnets have been an enabling technology for particle accelerators for more than 40 years. An introduction on the specific challenges of high field accelerator dipoles with respect to other devices, such as solenoids or detector magnets, will be provided followed by a brief historical overview of the development of Nb-Ti magnets for particle colliders, up to the 8 T dipole fields achieved in the LHC at 1.9 K.

Nb3Sn was considered as an option for LHC: will recall the development of Nb3Sn dipole short models in the 10 to 14 T range in the past 35 years.

The focus will then shift to the present status of Nb3Sn technology used in the quadrupoles to be installed at CERN in the High Luminosity LHC at the end of this decade, with 11.5 T operational peak field and lengths up to 7.5 m. To continue, the developments of Nb3Sn dipoles for future colliders aiming at an operational field of the order of 14 T will be discussed. High Temperature Superconductors are used as current leads in the LHC and are planned for the HL-LHC: we will give an outlook on the opportunities and challenges of making dipole magnets using HTS, to achieve fields of the order of 20 T, and advantages of higher operational temperature.

Status of Iron Based Superconductors: Characteristics and Relevant Properties for Applications

ABSTRACT: Since the discovery of iron-based superconductors (IBSs) on LaFePO in 2006 [1], many types of IBSs have been fabricated. IBSs have usually been compared to cuprates and MgB2, and the methodology of research developed by them have been implemented to IBSs. As a result, many similarities between IBSs and cuprates have been revealed, e.g., the parent compounds being antiferromagnets and grain boundaries being weak-links to some extent [2]. On the other hands, the distinct features of IBSs are highlighted as multiband superconductors (i.e., the 5 bands of Fe 3d orbital crossing Fermi level) and extended s-wave symmetry. Additionally, some of the IBSs are topological superconductors that can be possible platforms for quantum computing [3]. In this talk, an overview of IBS research and development in the last 18 years will be presented, involving characteristics of IBSs as well as strategies of increasing the superconducting transition temperature and critical current density. Finally, the history of research and development of IBSs is compared with those of the cuprates, and then future perspectives are discussed.

[1] Y. Kamihara, H. Hiramatsu, M. Hirano, R. Kawamura, H. Yanagi, T. Kamiya, H. Hosono, J. Am. Chem. Soc128, 10012 (2006).
[2] H. Hosono, A. Yamamoto, H. Hiramatsu, Y. Ma, Materials Today 21, 278 (2018).
[3] P. Zhang et al., Science 360, 182 (2018).

This work was supported by JST CREST Gran number JPMJCR18J4.

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