Influence of reactor irradiation on the mechanical behavior of ITER TF coil candidate insulation systems

Bittner-Rohrhofer, K.; Humer, K.; Fillunger, H.; Maix, R.; Wang, Z.D.; Weber, H.W.

doi:10.1016/s0920-3796(03)00340-5

Cited by 17 publications

(6 citation statements)

References 9 publications

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“…Right-hand side: Ambient temperature irradiation (TRIGA) and 5 K irradiation with a warm-up cycle to room temperature. (Ansaldo) and for the ground insulation (Alstom) of the TF model coil were reported by Bittner-Rohrhofer et al 77,78 Due to the winding process, the materials show strongly anisotropic properties (Fig. 23) and, therefore, require an assessment of the UTS and the ILSS for both orientations parallel and perpendicular to the winding direction.…”

Section: Methodsmentioning

confidence: 85%

Radiation Effects on Superconducting Fusion Magnet Components

Weber

2011

Int. J. Mod. Phys. E

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Nuclear fusion devices based on the magnetic confinement principle heavily rely on the existence and performance of superconducting magnets and have always significantly contributed to advancing superconductor and magnet technology to their limits. In view of the presently ongoing construction of the tokamak device ITER and the stellerator device Wendelstein 7X and their record breaking parameters concerning size, complexity of design, stored energy, amperage, mechanical and magnetic forces, critical current densities and stability requirements, it is deemed timely to review another critical parameter that is practically unique to these devices, namely the radiation response of all magnet components to the lifetime fluence of fast neutrons and gamma rays produced by the fusion reactions of deuterium and tritium. I will review these radiation effects in turn for the currently employed standard "technical" low temperature superconductors NbTi and Nb 3 Sn, the stabilizing material (Cu) as well as the magnet insulation materials and conclude by discussing the potential of high temperature superconducting materials for future generations of fusion devices, such as DEMO.

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Section: Methodsmentioning

confidence: 85%

Radiation Effects on Superconducting Fusion Magnet Components

Weber

2011

Int. J. Mod. Phys. E

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“…Also the 40 % system (T2) shows quite a similar radiation resistance, whereas the ILSS of systems with a lower CE content (T8 (30) and T10 (20)) drops by 45 %. Compared to the results of conventional epoxy resins, such as the TFMC systems, the least radiation resistant blend (T10) has still better mechanical properties, even after exposure to a 4 times higher neutron fluence [1,2,6].…”

Section: Interlaminar Shear Strengthmentioning

confidence: 92%

“…In order to find a suitable insulation system for the ITER toroidal field coils, which would withstand high radiation levels, extensive research was carried out over the past years [1][2][3][4][5][6]. It turned out that innovative resin mixtures containing cyanate ester (CE) showed excellent properties after exposure to the ITER design fluence of 1x10 22 m -2 (E>0.1 MeV) compared to traditional epoxy resins.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Cyanate Ester∕epoxy Blends After Reactor Irradiation to High Neutron Fluences

Prokopec¹,

Humer²,

Fillunger³

et al. 2008

AIP Conference Proceedings

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The mechanical strength of conventional epoxy resins drops dramatically after irradiation to a fast neutron fluence of 1x10 22 m -2 (E>0.1 MeV). Recent results demonstrated that cyanate ester / epoxy blends were not affected at this fluence level. The aim of this study is to investigate the performance potential of these blends at higher fluence levels without significant degradation of their mechanical properties. Short-beam shear as well as static tensile tests were carried out at 77 K prior to and after irradiation to fast neutron fluences of up to 4x10 22 m -2 (E>0.1 MeV) in the TRIGA reactor at ambient temperature (340 K). In addition, load controlled tension-tension fatigue measurements were performed, in order to simulate the pulsed operation conditions of a tokamak. Initial results show that only a small reduction of the mechanical strength under static and dynamic load is observed at a fast neutron fluence of 2x10 22 m -2 (E>0.1 MeV). After exposure to 4x10 22 m -2 (E>0.1 MeV) the interlaminar shear strength of materials with a cyanate ester content of 40 % or more is only reduced by 20 % to 30 %.

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“…Previous results on the ITER TF model coil insulation showed, that a glue with insufficient radiation resistance caused significant bubble formation, which led to severe degradation of the mechanical properties of the composite [1], [2]. In order to find an adequate solution for ITER, two different bonded tapes were supplied by Arisawa, Japan, and Advanced Composites Group (ACG), United Kingdom.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Bonded Glass/Polyimide Tapes for the ITER TF Coil Insulation

Prokopec

Humer

Maix

et al. 2012

IEEE Trans. Appl. Supercond.

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The insulation of the ITER TF coils consists of multiple wrapped layers of glass fiber polyimide sandwich tapes. In order to simplify the fabrication process, the polyimide tape can be bonded to the glass fiber tape, mainly to avoid misalignments of the polyimide tape. However, due to the intense neutron and -radiation exposure, bonding agents have to be radiation resistant, otherwise the composite will be severely damaged, as was observed for the ITER TF model coil insulation.Two bonded glass fiber polyimide tapes (40 mm wide, 0.175 mm thick) were supplied by Arisawa, Japan, and Advanced Composites Group, United Kingdom. Test materials were fabricated based on the build-up of the ITER TF turn insulation and vacuum pressure impregnated with a 40:60 cyanate ester/epoxy blend supplied by Huntsman, Switzerland.The mechanical properties of these materials were characterized prior to and after reactor irradiation to a fast neutron fluence of , i.e. twice the ITER design fluence. Static and dynamic tensile tests were carried out at RT and 77 K. The Arisawa tape showed excellent mechanical properties.

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Influence of reactor irradiation on the mechanical behavior of ITER TF coil candidate insulation systems

Cited by 17 publications

References 9 publications

Radiation Effects on Superconducting Fusion Magnet Components

Radiation Effects on Superconducting Fusion Magnet Components

Mechanical Behaviour of Cyanate Ester∕epoxy Blends After Reactor Irradiation to High Neutron Fluences

Characterization of Bonded Glass/Polyimide Tapes for the ITER TF Coil Insulation

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