### 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 language | English |
---|---|

Pages (from-to) | 215-220 |

Number of pages | 6 |

Journal | Cryogenics |

Volume | 80 |

DOIs | |

Publication status | Published - Dec 1 2016 |

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### All Science Journal Classification (ASJC) codes

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

### Cite this

*Cryogenics*,

*80*, 215-220. https://doi.org/10.1016/j.cryogenics.2016.05.010

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

Research output: Contribution to journal › Article

*Cryogenics*, vol. 80, pp. 215-220. https://doi.org/10.1016/j.cryogenics.2016.05.010

}

TY - JOUR

T1 - AC loss evaluation of an HTS insert for high field magnet cooled by cryocoolers

AU - Kajikawa, Kazuhiro

AU - Awaji, Satoshi

AU - Watanabe, Kazuo

PY - 2016/12/1

Y1 - 2016/12/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84973532014&partnerID=8YFLogxK

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U2 - 10.1016/j.cryogenics.2016.05.010

DO - 10.1016/j.cryogenics.2016.05.010

M3 - Article

AN - SCOPUS:84973532014

VL - 80

SP - 215

EP - 220

JO - Cryogenics

JF - Cryogenics

SN - 0011-2275

ER -