Development of non-circular REBCO pancake coil for high-temperature superconducting cyclotron

Xudong Wang, Hirotaka Umeda, Atsushi Ishiyama, Masaki Tashiro, Hiroshi Yamakawa, Hiroshi Ueda, Tomonori Watanabe, Shigeo Nagaya

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A series of feasibility studies are carried out on the applications of a high-temperature superconducting (HTS) magnet system to a heavy-ion accelerator for particle cancer therapy. A novel HTS cyclotron is expected to be more compact and have higher efficiency than a conventional heavy ion synchrotron accelerator. A high current density is required for the HTS magnet to realize a compact HTS cyclotron. Further, a high-strength reinforcing structure is absolutely essential for the HTS magnet owing to the large Lorentz force caused by the high current density to prevent the magnet deformation and maintain the required high accuracy field. In a previous study, a novel coil structure called the Y-based oxide superconductor and reinforcing outer integrated 'YOROI coil' was proposed and tested at 4.2 K in 8-T backup fields. The YOROI model coil exhibited no degradation after the excitation test with a maximum hoop stress of 1.7 GPa determined by the product of the magnetic field, current density, and coil radius. The mechanism of stress sharing between the coil winding and the reinforcing structures of the YOROI coil was numerically determined. In addition, the electromagnetic and mechanical properties of a reinforcing structure based on the YOROI coil for circular REBCO coils assuming part of the HTS cyclotron magnet system was also numerically simulated in the previous paper. In this study, a new reinforcing structure is proposed on the basis of the YOROI coil for a non-circular REBCO coil assuming part of the HTS cyclotron magnet system. The electromagnetic and mechanical properties for the new reinforcing structure are numerically determined. As a result, the proposed reinforcing structure has great ability to reduce the stress and strain acting on the coil winding to maintain the coil shape and prevent degradation in the REBCO wire.

Original languageEnglish
Article number6939618
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - Jun 1 2015
Externally publishedYes

Fingerprint

Cyclotrons
cyclotrons
coils
Superconducting magnets
Magnets
Heavy Ions
Current density
Temperature
Heavy ions
superconducting magnets
magnets
electromagnetic properties
Oxide superconductors
Degradation
Lorentz force
Mechanical properties
current density
high current
Synchrotrons
heavy ions

Keywords

  • Lorentz force
  • numerical analysis
  • reinforcing structure
  • strain
  • stress

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Development of non-circular REBCO pancake coil for high-temperature superconducting cyclotron. / Wang, Xudong; Umeda, Hirotaka; Ishiyama, Atsushi; Tashiro, Masaki; Yamakawa, Hiroshi; Ueda, Hiroshi; Watanabe, Tomonori; Nagaya, Shigeo.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, 6939618, 01.06.2015.

Research output: Contribution to journalArticle

Wang, Xudong ; Umeda, Hirotaka ; Ishiyama, Atsushi ; Tashiro, Masaki ; Yamakawa, Hiroshi ; Ueda, Hiroshi ; Watanabe, Tomonori ; Nagaya, Shigeo. / Development of non-circular REBCO pancake coil for high-temperature superconducting cyclotron. In: IEEE Transactions on Applied Superconductivity. 2015 ; Vol. 25, No. 3.
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