Acceptance Test of Pre-Compression Rings for ITER Magnet System

In the ITER machine, two sets of three pre-compression rings will be installed at the top and bottom of the 18 toroidal field coil structures. The rings will tightly hold the coils with a radial force of 4,800 t per coil against the operating forces. Four other pre-compression rings will serve as sp...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 34; no. 5; pp. 1 - 5
Main Authors Ilyin, Yuri, Mitchell, Neil, Sanchez, Angela Hernandez, Boter, Eva, Semeraro, Luigi, Bonito-Oliva, Alessandro, Besson, Remi, Torres, Luc, Balut, Nicolas, Herve, Catherine, Baikalov, Andrei, Lim, Byung Su, Boyer, Christelle, Liao, Min
Format Journal Article
LanguageEnglish
Published New York IEEE 01.08.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Acceptance tests
Acoustic emission
Bonding
Coils
Composite structures
Diameters
Emission analysis
Fiberglass
Field coils
Glass fiber reinforced plastics
ITER
magnets for fusion
Manganese
pre-compression rings
pultruded composite
Stress
Stress relaxation
Stress relaxation tests
Structural rings
Testing
Windings
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Summary:In the ITER machine, two sets of three pre-compression rings will be installed at the top and bottom of the 18 toroidal field coil structures. The rings will tightly hold the coils with a radial force of 4,800 t per coil against the operating forces. Four other pre-compression rings will serve as spares. Weighing 3.4 t each, with an inner diameter of 5 m, the rings made of pultruded S-fiberglass composite are possibly the largest and most highly stressed composite structures to be designed for a cryogenic environment. All 10 rings have been delivered to ITER and tested at the ITER pre-compression ring facility at a double nominal stress level. The facility is used to measure the stress at rupture of sub-size rings and for acceptance tests of the full size rings. These tests are supplemented by the stress relaxation test at nominal load on a ring equipped with acoustic sensors, to confirm that the creep performances are also adequate. The paper discuss the design of the rings, the manufacturing route, and the test results including the analysis of the acoustic emission signals.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2024.3376660