Qualification program of lap joints for ITER coils

Yuri Ilyin, Fabrice Simon, Qing Hua, Andrei Baikalov, Chen Yu Gung, Hyungjun Kim, Bernard Turck, Kazuya Hamada, Sebastien Koczorowski, Nello Dolgetta, Cormany Carl, Enrique Gaxiola, Alexander Vostner, Byung Su Lim, Paul Libeyre, Arnaud Devred, Neil Mitchell

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The superconducting coils of the ITER magnet system have hundreds of electrical lap joints interconnecting superconducting cables. The joints operate in a magnetic field of up to 4 T, field derivatives of 0.5 T/s, and currents up to 70 kA. The acceptance tests for the toroidal field (TF), poloidal field (PF), and correction coil (CC) coils will be performed at 77 K, before they are assembled in the pit. Hence there will be no possibility to measure the resistance of the joints in the superconducting state before the whole magnet system is enclosed in the Tokamak cryostat. In addition, no reliable nondestructive method has been found to spot the joints with a failure at room temperature. Therefore, the production of the joints relies on the strict adhesion to established robust manufacturing procedures during the qualification phase. As additional quality monitoring, a periodic test of the joint samples manufactured in parallel with a coil fabrication is foreseen to control the reproducibility of the joint electrical performance. In order to qualify the manufacturing procedures, to establish a series production tools and worker teams, a comprehensive qualification program has been set up for manufacturers of the coils in Russia (Poloidal Coil 1, PF1), China (PF6, feeders, CC), Japan (TF), Europe (TF and PF), and USA (Central Solenoid, CS). This program includes a set of mockups manufactured according to the process to be used for the coils and submitted to different tests. They include mechanical testing of materials, electrical tests of full size joint samples, destructive microscopic examination of the joint mockups, and mechanical testing of the full size joint mockups. All tests are carried out in specialized laboratories qualified for this type of work. This paper describes the main items of the qualification program, the tests performed, and the acceptance criteria. The test results are reported and compared to the criteria.

Original languageEnglish
Article number4201306
JournalIEEE Transactions on Applied Superconductivity
Volume28
Issue number3
DOIs
Publication statusPublished - 2018 Apr 1

Fingerprint

Mockups
lap joints
qualifications
coils
Mechanical testing
Magnets
Superconducting cables
Acceptance tests
Cryostats
Solenoids
Microscopic examination
Adhesion
Magnetic fields
Derivatives
Fabrication
acceptability
Monitoring
magnets
manufacturing
feeders

All Science Journal Classification (ASJC) codes

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

Cite this

Ilyin, Y., Simon, F., Hua, Q., Baikalov, A., Gung, C. Y., Kim, H., ... Mitchell, N. (2018). Qualification program of lap joints for ITER coils. IEEE Transactions on Applied Superconductivity, 28(3), [4201306]. https://doi.org/10.1109/TASC.2017.2778102
Ilyin, Yuri ; Simon, Fabrice ; Hua, Qing ; Baikalov, Andrei ; Gung, Chen Yu ; Kim, Hyungjun ; Turck, Bernard ; Hamada, Kazuya ; Koczorowski, Sebastien ; Dolgetta, Nello ; Carl, Cormany ; Gaxiola, Enrique ; Vostner, Alexander ; Lim, Byung Su ; Libeyre, Paul ; Devred, Arnaud ; Mitchell, Neil. / Qualification program of lap joints for ITER coils. In: IEEE Transactions on Applied Superconductivity. 2018 ; Vol. 28, No. 3.
@article{e2d57ca948e04c73a4d426fac7257370,
title = "Qualification program of lap joints for ITER coils",
abstract = "The superconducting coils of the ITER magnet system have hundreds of electrical lap joints interconnecting superconducting cables. The joints operate in a magnetic field of up to 4 T, field derivatives of 0.5 T/s, and currents up to 70 kA. The acceptance tests for the toroidal field (TF), poloidal field (PF), and correction coil (CC) coils will be performed at 77 K, before they are assembled in the pit. Hence there will be no possibility to measure the resistance of the joints in the superconducting state before the whole magnet system is enclosed in the Tokamak cryostat. In addition, no reliable nondestructive method has been found to spot the joints with a failure at room temperature. Therefore, the production of the joints relies on the strict adhesion to established robust manufacturing procedures during the qualification phase. As additional quality monitoring, a periodic test of the joint samples manufactured in parallel with a coil fabrication is foreseen to control the reproducibility of the joint electrical performance. In order to qualify the manufacturing procedures, to establish a series production tools and worker teams, a comprehensive qualification program has been set up for manufacturers of the coils in Russia (Poloidal Coil 1, PF1), China (PF6, feeders, CC), Japan (TF), Europe (TF and PF), and USA (Central Solenoid, CS). This program includes a set of mockups manufactured according to the process to be used for the coils and submitted to different tests. They include mechanical testing of materials, electrical tests of full size joint samples, destructive microscopic examination of the joint mockups, and mechanical testing of the full size joint mockups. All tests are carried out in specialized laboratories qualified for this type of work. This paper describes the main items of the qualification program, the tests performed, and the acceptance criteria. The test results are reported and compared to the criteria.",
author = "Yuri Ilyin and Fabrice Simon and Qing Hua and Andrei Baikalov and Gung, {Chen Yu} and Hyungjun Kim and Bernard Turck and Kazuya Hamada and Sebastien Koczorowski and Nello Dolgetta and Cormany Carl and Enrique Gaxiola and Alexander Vostner and Lim, {Byung Su} and Paul Libeyre and Arnaud Devred and Neil Mitchell",
year = "2018",
month = "4",
day = "1",
doi = "10.1109/TASC.2017.2778102",
language = "English",
volume = "28",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "3",

}

Ilyin, Y, Simon, F, Hua, Q, Baikalov, A, Gung, CY, Kim, H, Turck, B, Hamada, K, Koczorowski, S, Dolgetta, N, Carl, C, Gaxiola, E, Vostner, A, Lim, BS, Libeyre, P, Devred, A & Mitchell, N 2018, 'Qualification program of lap joints for ITER coils', IEEE Transactions on Applied Superconductivity, vol. 28, no. 3, 4201306. https://doi.org/10.1109/TASC.2017.2778102

Qualification program of lap joints for ITER coils. / Ilyin, Yuri; Simon, Fabrice; Hua, Qing; Baikalov, Andrei; Gung, Chen Yu; Kim, Hyungjun; Turck, Bernard; Hamada, Kazuya; Koczorowski, Sebastien; Dolgetta, Nello; Carl, Cormany; Gaxiola, Enrique; Vostner, Alexander; Lim, Byung Su; Libeyre, Paul; Devred, Arnaud; Mitchell, Neil.

In: IEEE Transactions on Applied Superconductivity, Vol. 28, No. 3, 4201306, 01.04.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Qualification program of lap joints for ITER coils

AU - Ilyin, Yuri

AU - Simon, Fabrice

AU - Hua, Qing

AU - Baikalov, Andrei

AU - Gung, Chen Yu

AU - Kim, Hyungjun

AU - Turck, Bernard

AU - Hamada, Kazuya

AU - Koczorowski, Sebastien

AU - Dolgetta, Nello

AU - Carl, Cormany

AU - Gaxiola, Enrique

AU - Vostner, Alexander

AU - Lim, Byung Su

AU - Libeyre, Paul

AU - Devred, Arnaud

AU - Mitchell, Neil

PY - 2018/4/1

Y1 - 2018/4/1

N2 - The superconducting coils of the ITER magnet system have hundreds of electrical lap joints interconnecting superconducting cables. The joints operate in a magnetic field of up to 4 T, field derivatives of 0.5 T/s, and currents up to 70 kA. The acceptance tests for the toroidal field (TF), poloidal field (PF), and correction coil (CC) coils will be performed at 77 K, before they are assembled in the pit. Hence there will be no possibility to measure the resistance of the joints in the superconducting state before the whole magnet system is enclosed in the Tokamak cryostat. In addition, no reliable nondestructive method has been found to spot the joints with a failure at room temperature. Therefore, the production of the joints relies on the strict adhesion to established robust manufacturing procedures during the qualification phase. As additional quality monitoring, a periodic test of the joint samples manufactured in parallel with a coil fabrication is foreseen to control the reproducibility of the joint electrical performance. In order to qualify the manufacturing procedures, to establish a series production tools and worker teams, a comprehensive qualification program has been set up for manufacturers of the coils in Russia (Poloidal Coil 1, PF1), China (PF6, feeders, CC), Japan (TF), Europe (TF and PF), and USA (Central Solenoid, CS). This program includes a set of mockups manufactured according to the process to be used for the coils and submitted to different tests. They include mechanical testing of materials, electrical tests of full size joint samples, destructive microscopic examination of the joint mockups, and mechanical testing of the full size joint mockups. All tests are carried out in specialized laboratories qualified for this type of work. This paper describes the main items of the qualification program, the tests performed, and the acceptance criteria. The test results are reported and compared to the criteria.

AB - The superconducting coils of the ITER magnet system have hundreds of electrical lap joints interconnecting superconducting cables. The joints operate in a magnetic field of up to 4 T, field derivatives of 0.5 T/s, and currents up to 70 kA. The acceptance tests for the toroidal field (TF), poloidal field (PF), and correction coil (CC) coils will be performed at 77 K, before they are assembled in the pit. Hence there will be no possibility to measure the resistance of the joints in the superconducting state before the whole magnet system is enclosed in the Tokamak cryostat. In addition, no reliable nondestructive method has been found to spot the joints with a failure at room temperature. Therefore, the production of the joints relies on the strict adhesion to established robust manufacturing procedures during the qualification phase. As additional quality monitoring, a periodic test of the joint samples manufactured in parallel with a coil fabrication is foreseen to control the reproducibility of the joint electrical performance. In order to qualify the manufacturing procedures, to establish a series production tools and worker teams, a comprehensive qualification program has been set up for manufacturers of the coils in Russia (Poloidal Coil 1, PF1), China (PF6, feeders, CC), Japan (TF), Europe (TF and PF), and USA (Central Solenoid, CS). This program includes a set of mockups manufactured according to the process to be used for the coils and submitted to different tests. They include mechanical testing of materials, electrical tests of full size joint samples, destructive microscopic examination of the joint mockups, and mechanical testing of the full size joint mockups. All tests are carried out in specialized laboratories qualified for this type of work. This paper describes the main items of the qualification program, the tests performed, and the acceptance criteria. The test results are reported and compared to the criteria.

UR - http://www.scopus.com/inward/record.url?scp=85038822993&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85038822993&partnerID=8YFLogxK

U2 - 10.1109/TASC.2017.2778102

DO - 10.1109/TASC.2017.2778102

M3 - Article

AN - SCOPUS:85038822993

VL - 28

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 3

M1 - 4201306

ER -