Development of a filled resin system for the TF coils of ITER

Canfer, Simon; Robertson, Stephen J.; Baynham, E.; Evans, D.; Ellwood, G.; Jones, Stephanie H.; Knaster, J.

doi:10.1016/j.fusengdes.2011.04.040

Cited by 15 publications

(11 citation statements)

References 2 publications

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“…The assembly clearance gaps between the WP and Casing are designed to remove the requirement for tight tolerances on all WP Casing mating interfaces; to allow clearance for assembly and to allow adjustment of the WP relative to the Casing [2]. However, it will be essential to fill these gaps efficiently as the last step in the Casing Insertion operation.…”

Section: Materials and Process Requirementsmentioning

confidence: 99%

“…Full details of flow tests are recorded in [2] To investigate the effect of longer flow paths, a 7mm diameter, 10m length of tube was arranged horizontally in an oven at 40qC and filled as before using vacuum at one end on the tube. The assumed viscosity to fit the Stokes equation was 37 to 44 Pa.s for the 41% filled epoxy and full details are reported in [2].. A 9m vertical trial was also undertaken, with a 4 bar pressure applied to the resin at the base of the column. The resin was held at 40qC for 24 hours before continuing with the cure.…”

Section: Resin Flow and Distributionmentioning

confidence: 99%

“…Measurements of thermal contraction down to 77 K were made and full details can be found in [2]. Depending on the geometry, the differential contraction between filled resin and stainless steel could result in significant strains when the structure is cooled to 4 K. Resin is trapped between the WP and the CC and in the corner sections of the coil case, the resin is trapped between the two components in a position where the radius can be only 25 mm.…”

Section: Thermal Strainmentioning

confidence: 99%

See 2 more Smart Citations

Physical properties of a resin system for filling the inter-space in the ITER TF coil casing

Evans¹,

Baynahm²,

Canfer³

et al. 2014

AIP Conference Proceedings

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Evaluation of inter-laminar shear strength of GFRP composed of bonded glass/polyimide tapes and cyanateester/epoxy blended resin for ITER TF coils AIP Conference Proceedings 1574, 154 (2014) Abstract. Each of the eighteen ITER Toroidal Field (TF) coils will consist of seven double pancakes. Each double pancake will have been individually vacuum impregnated and then the seven units assembled together, over-wrapped with glass fabric based insulation and finally vacuum impregnated again to form the TF coil winding pack [1]. The winding pack (WP) will be finally assembled into the coil casing (CC) and to allow for manufacturing tolerances and final geometric definition, a nominal 10 mm gap will exist between the winding pack and the coil case but in practice, this gap may vary between 3 and 15 mm. After assembly, the final step will be to fill the gap with a material that will maintain the final position of the WP and to uniformly transfer load from WP to CC. This paper deals with the selection of materials and techniques to fill the gap and details some of the properties of the chosen material.

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Section: Materials and Process Requirementsmentioning

confidence: 99%

Section: Resin Flow and Distributionmentioning

confidence: 99%

Section: Thermal Strainmentioning

confidence: 99%

See 1 more Smart Citation

Physical properties of a resin system for filling the inter-space in the ITER TF coil casing

Evans¹,

Baynahm²,

Canfer³

et al. 2014

AIP Conference Proceedings

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“…Viscosity measurements at different temperatures have shown that filling at 40 would be possible as the resin viscosity would not increase by more than 50% after about 24 hours, which is considered as a reasonable time for the filling operation. A cure schedule of 14 h at 70 (gel conditions) and 15 h at 90 was determined with 84% conversion of reactive groups [7]. Trials with different fillers were done and settling of the resin was overcome with dolomite and wollastonite by addition of a small percentage of calcined clay.…”

Section: Winding Pack To Coil Case Interfacementioning

confidence: 99%

The Toroidal Field Coils for the ITER Project

Savary

Gallix

Knaster

et al. 2012

IEEE Trans. Appl. Supercond.

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The ITER Magnet System contains 18 Toroidal Field Coils (TFC). These are large D-shaped coils of about 300 t, 17.5-m height and 9-m width. They consist of a Winding Pack (WP) enclosed in a rigid structural steel case, the Toroidal Field Coil Case (TFCC). The WP is a bonded structure of 7 Double Pancakes (DP), each made up of a radial plate (RP) housing the reacted cable-in-conduit superconductor (CICC), which operate at 4.5 K in supercritical helium. The conductor carries a current of 68 kA in operation to produce a nominal peak field of 11.8 T. The total stored magnetic energy in the 18 TFCs is 41 GJ. While the Japanese and European Domestic Agencies that are in charge of the procurement of the TFCs are progressing with the manufacturing design and the fabrication trials prior to launch the production of the real coils, the ITER Organization (IO) is completing the development and qualification of the most critical items, e.g. cyanate ester and resin blends for the conductor and WP insulation system, the terminal region, the helium inlet, a charged resin system for the filling of the gap between the WP and the TFCC and the general tolerancing especially at the interfaces between the neighboring systems. This paper presents the final design of the TFCs and the results of the developments carried out in the aforementioned areas in the last 2 years.

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“…For the cyanate ester-epoxy blend (by weight 60% epoxy and 40% cyanate ester), a cure cycle of 6 hours at 100°C, 4 hours at 120°C and 17 hours at 150°C was used [4]. For the tri-functional epoxy TGPAP-DETDA, a cure cycle of 14 hours at 70°C and 15 hours at 90°C was used [5].…”

Section: Electrical Insulation Systemsmentioning

confidence: 99%

Heat transfer through cyanate ester epoxy mix and epoxy TGPAP - DETDA electrical insulations at superfluid helium temperature

Pietrowicz¹,

Four²,

Canfer³

et al. 2012

AIP Conference Proceedings

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A high magnetic field accelerator magnet of 13 T is being developed in Work Package 7 of the European Union FP7 project EuCARD. The application is to enable higher luminosities and energies for accelerators such as the LHC. The high magnetic field demands superconductors that require a heat treatment step such as Nb 3 Sn. This paper reports thermal tests on conventional composite electrical insulation with pressurized superfluid helium at atmospheric pressure as a coolant. Two composite insulation systems composed of cyanate ester epoxy mix or a tri-functional epoxy (TGPAP-DETDA) with Sglass fiber, have been chosen as candidate materials. The knowledge of their thermal properties is necessary for the thermal design and therefore samples have been tested in pressurized He II where heat is applied perpendicularly to the fibers between 1.6 K and 2.0 K. Overall thermal resistance is determined as a function of temperature and the results are compared with other electrical insulation systems used for accelerator magnets.

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Development of a filled resin system for the TF coils of ITER

Cited by 15 publications

References 2 publications

Physical properties of a resin system for filling the inter-space in the ITER TF coil casing

Physical properties of a resin system for filling the inter-space in the ITER TF coil casing

The Toroidal Field Coils for the ITER Project

Heat transfer through cyanate ester epoxy mix and epoxy TGPAP - DETDA electrical insulations at superfluid helium temperature

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