Numerical simulation of critical current performance in nb3sn strand subjected to periodic bending deformation

Haruyuki Murakami, Hiroshi Ueda, Atsushi Ishiyama, Norikiyo Koizumi, Kiyoshi Okuno

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In the ITER Engineering Design Activity (EDA), four NB3Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer from being contaminated by Sn, twist pitch of the strand, and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation.

Original languageEnglish
Pages (from-to)853-859
Number of pages7
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Volume171
Issue number3
DOIs
Publication statusPublished - May 2010
Externally publishedYes

Fingerprint

Critical currents
Computer simulation
Bronze
Stiffness
Degradation
Networks (circuits)
Experiments
Temperature

Keywords

  • Bending strain
  • CIC conductor
  • Critical current
  • Degradation
  • NbSn

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

Cite this

Numerical simulation of critical current performance in nb3sn strand subjected to periodic bending deformation. / Murakami, Haruyuki; Ueda, Hiroshi; Ishiyama, Atsushi; Koizumi, Norikiyo; Okuno, Kiyoshi.

In: Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi), Vol. 171, No. 3, 05.2010, p. 853-859.

Research output: Contribution to journalArticle

@article{65a449471b13471fa2c45cbbd7067193,
title = "Numerical simulation of critical current performance in nb3sn strand subjected to periodic bending deformation",
abstract = "In the ITER Engineering Design Activity (EDA), four NB3Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer from being contaminated by Sn, twist pitch of the strand, and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation.",
keywords = "Bending strain, CIC conductor, Critical current, Degradation, NbSn",
author = "Haruyuki Murakami and Hiroshi Ueda and Atsushi Ishiyama and Norikiyo Koizumi and Kiyoshi Okuno",
year = "2010",
month = "5",
doi = "10.1002/eej.20923",
language = "English",
volume = "171",
pages = "853--859",
journal = "Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)",
issn = "0424-7760",
publisher = "John Wiley and Sons Inc.",
number = "3",

}

TY - JOUR

T1 - Numerical simulation of critical current performance in nb3sn strand subjected to periodic bending deformation

AU - Murakami, Haruyuki

AU - Ueda, Hiroshi

AU - Ishiyama, Atsushi

AU - Koizumi, Norikiyo

AU - Okuno, Kiyoshi

PY - 2010/5

Y1 - 2010/5

N2 - In the ITER Engineering Design Activity (EDA), four NB3Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer from being contaminated by Sn, twist pitch of the strand, and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation.

AB - In the ITER Engineering Design Activity (EDA), four NB3Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer from being contaminated by Sn, twist pitch of the strand, and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation.

KW - Bending strain

KW - CIC conductor

KW - Critical current

KW - Degradation

KW - NbSn

UR - http://www.scopus.com/inward/record.url?scp=77449141077&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77449141077&partnerID=8YFLogxK

U2 - 10.1002/eej.20923

DO - 10.1002/eej.20923

M3 - Article

VL - 171

SP - 853

EP - 859

JO - Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)

JF - Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)

SN - 0424-7760

IS - 3

ER -