AC loss evaluation of an HTS insert for high field magnet cooled by cryocoolers

Kazuhiro Kajikawa, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

AC losses in a high temperature superconducting (HTS) insert coil for 25-T cryogen-free superconducting magnet during its initial energization are numerically calculated under the assumption of slab approximation. The HTS insert consisting of 68 single pancakes wound using coated conductors generates a central magnetic field of 11.5 T in addition to the contribution of 14.0 T from a set of low temperature superconducting (LTS) outsert coils. Both the HTS insert and the LTS coils are cooled using cryocoolers, and energized simultaneously up to the central field of 25.5 T with a constant ramp rate for 60 min. The influences of the magnitudes and orientations of locally applied magnetic fields, magnetic interactions between turns and transport currents flowing in the windings are taken into account in the calculations of AC losses. The locally applied fields are separated into axial and radial components, and the individual contributions of these field components to the AC losses are simply summed up to obtain the total losses. The AC losses due to the axial fields become major in the beginning of energization, whereas the total losses monotonically increase with time after the AC losses due to the radial fields become major.

Original languageEnglish
Pages (from-to)215-220
Number of pages6
JournalCryogenics
Volume80
DOIs
Publication statusPublished - Dec 1 2016

Fingerprint

high field magnets
inserts
Magnets
alternating current
evaluation
coils
Temperature
Magnetic fields
Superconducting magnets
superconducting magnets
ramps
magnetic fields
slabs
conductors
approximation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

AC loss evaluation of an HTS insert for high field magnet cooled by cryocoolers. / Kajikawa, Kazuhiro; Awaji, Satoshi; Watanabe, Kazuo.

In: Cryogenics, Vol. 80, 01.12.2016, p. 215-220.

Research output: Contribution to journalArticle

Kajikawa, Kazuhiro ; Awaji, Satoshi ; Watanabe, Kazuo. / AC loss evaluation of an HTS insert for high field magnet cooled by cryocoolers. In: Cryogenics. 2016 ; Vol. 80. pp. 215-220.
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