MT25 Conference 2017 - Timetable, Abstracts, Orals and Posters

27 August 2017 to 1 September 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone

Characteristics of an HTS dipole magnet

30 Aug 2017, 13:15
1h 45m
Posters Area

Posters Area

Poster Presentation of 1h45m C3 - HTS Insert and Model Magnets

Speaker

Kento Suzuki (High Energy Accelerator Research Organization)

Description

High $T_{c}$ superconductor (HTS) could be a key to evolve the magnet technology as it is superior to low $T_{c}$ superconductor (LTS) in terms of the critical current density, critical magnetic field, and critical temperature. REBa$_2$Cu$_3$O$_{7-x}$ (REBCO) coated conductor (CC), which is in common use as the commercially available HTS, is suitable for fabrication of the magnet since it is easy-to-use for winding magnet coils. There is however a concern about application of REBCO CC as exemplified by large shielding currents which could eventually cause a large field error. In addition, one needs to take account of the slow normal zone propagation velocity that HTS owns. Once we solve these issues, use of HTS could be spread across various magnetic devices, including a rotating gantry which provides effective treatment of cancer for the external beam radiotherapy. Indeed, HTS is expected to provide stable operation even in high-field environment and thus enables us to miniaturize the existing huge system such as the gantry for heavy-ion radiotherapy. Verification test of the HTS dipole magnet for the rotating gantry was conducted in collaboration with KEK, Toshiba Corporation, and Kyoto University. Fabrication of the model magnet was complete in 2016, and field measurement was also made in the same year. In conclusion, we found larger field non-uniformity as compared to our numerical calculation, reason of which can partially be explained by mi-aliments of the coils. After that, we decided to continue the measurement using the model magnet in order for a further investigation into characteristics of the HTS magnet such as temporal variation of the magnetization due to the shielding current and flux jump. In this paper, we report results from the continued measurement with the HTS dipole magnet.

Submitters Country Japan

Primary author

Kento Suzuki (High Energy Accelerator Research Organization)

Co-authors

Mr Yusuke Ishii (Toshiba Corporation) Mr Kei Koyanagi (Toshiba Corporation) Shigeki Takayama (Toshiba Corporation) Dr Kenji Tasaki (Toshiba Corporation) Prof. Naoyuki Amemiya (Kyoto University)