Development of High Strength Pancake Coil With Stress Controlling Structure by REBCO Coated Conductor

Nagàya, Shigeo; Watanabe, T.; Tamada, T.; Naruse, M.; Kashima, N.; Katagiri, Toshio; Hirano, Naoki; Awaji, Satoshi; Oguro, Hidetoshi; Ishiyama, Atsushi

doi:10.1109/tasc.2012.2233854

Cited by 37 publications

(5 citation statements)

References 7 publications

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“…The hat structure may be similar to a Yoroi-coil structure, which has been proposed for reinforcement of the pancake coil wound by REBaCuO tape on the Hastelloy substrate, so that it may withstand the electromagnetic hoop stress [29,30]. The outer plates made of glass fibre reinforced plastics (GFRP) or carbon fibre reinforced plastics (CFRP) in the Yoroi-coil structure exist on the pancake coil.…”

Section: Overall Shrink-fit Effect From 540 K To 50 Kmentioning

confidence: 99%

Promising effects of a new hat structure and double metal ring for mechanical reinforcement of a REBaCuO ring-shaped bulk during field-cooled magnetisation at 10 T without fracture

Fujishiro¹,

Naito²,

Yanagi³

et al. 2019

Supercond. Sci. Technol.

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PAPERPromising effects of a new hat structure and double metal ring for mechanical reinforcement of a REBaCuO ring-shaped bulk during fieldcooled magnetisation at 10 T without fracture AbstractWe have investigated a new reinforcement hat structure for a RE-Ba-Cu-O (REBaCuO, RE: rare earth element or Y) ring-shaped bulk superconductor (ring bulk) shrink-fitted with a double Al alloy ring and set on the cold stage of a cryogenic refrigerator prior to field-cooled magnetisation (FCM). With the hat structure, a ring bulk having an outer diameter of 64 mm, inner diameter of 40 mm, and height of 20.5 mm achieved a trapped field as high as 6.8 T at 50 K during FCM with an applied magnetic field at B app =10 T without fracture; a similar ring bulk without the hat structure broke during FCM at B app =8.8 T. Using a numerical simulation for electromagnetic and mechanical properties, the potential benefit of the hat structure was confirmed. The magnetic field dependence of the average critical current density J c (B) of the ring bulk used in the simulation was determined by experimental results of time step dependence of the trapped field B z at the bulk centre. As a result, the total hoop stress σ θ total in the ring bulk including the resulting stress of cooling from 300 K to 50 K and subsequent FCM at B app =10 T is lower than the fracture strength of a typical Ag-doped REBaCuO bulk material. The effect of double Al alloy ring reinforcement was also analysed using a numerical simulation and compared with that of the conventional single Al alloy ring reinforcement. These results suggest that the double ring provides only a limited benefit, whereas the hat structure is fairly effective in reducing the electromagnetic hoop stress during FCM at B app =10 T. Using this reinforcement method, a 400 MHz (9.4 T) nuclear magnetic resonance bulk magnet system could be realised.

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Section: Overall Shrink-fit Effect From 540 K To 50 Kmentioning

confidence: 99%

Promising effects of a new hat structure and double metal ring for mechanical reinforcement of a REBaCuO ring-shaped bulk during field-cooled magnetisation at 10 T without fracture

Fujishiro¹,

Naito²,

Yanagi³

et al. 2019

Supercond. Sci. Technol.

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“…For magnets designs not requiring high spatial field homogeneity, other stress management designs are possible. For an SMES unit, Nagaya et al [113] are developing the 'Yoroi-coil' structure, where a part of the electromagnetic force is shifted from the conductor to the reinforcing outer plates situated at the side of the coil (figure 9). Using the Yoroi-coil structure concept, they demonstrated that it would be possible to push a calculated magnetic hoop stress of a 100 μm thick Hastelloy-backed conductor to beyond 1.6 GPa versus a typical conductor limit of 1.3 GPa [114].…”

Section: Coil Insulationmentioning

confidence: 99%

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Senatore

Alessandrini

Lucarelli

et al. 2014

Supercond. Sci. Technol.

255

136

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Recent progresses in the second generation REBa 2 Cu 3 O 7 − x (RE123) coated conductor (CC) have paved a way for the development of superconducting solenoids capable of generating fields well above 23.5 T, i.e. the limit of NbTi−Nb 3 Sn-based magnets. However, the RE123 magnet still poses several fundamental and engineering challenges. In this work we review the state-ofthe-art of conductor and magnet technologies. The goal is to illustrate a close synergetic relationship between evolution of high-field magnets and advancement in superconductor technology. The paper is organized in three parts: (1) the basics of RE123 CC fabrication technique, including latest developments to improve conductor performance and production throughput; (2) critical issues and innovative design concepts for the RE123-based magnet; and (3) an overview of noteworthy ongoing magnet projects.

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“…Fixed terminals with current leads cause the circumferentially nonuniform distribution of hoop stresses. The effects of metal reinforcement like over-band or YOROI structure [23] should be investigated in the near future.…”

Section: Discussionmentioning

confidence: 99%

Stress and Deformation Analysis of REBCO Pancake Coils With Individual Turn Movement

Kodaka

Noguchi

2023

IEEE Trans. Appl. Supercond.

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In recent years, rare-earth barium copper oxide (REBCO) pancake coils have shown excellent performances in high magnetic field applications. The no-insulation (NI) winding technique enables to enhance the thermal stability and current density of REBCO pancake coils. Still, further developments of REBCO coils are expected; e.g., the mechanical deteriorations of REBCO tapes caused by electromagnetic forces have been reported. The screening currents are considered as one of the causes to damage the REBCO tapes because of a nonuniform current distribution. Meanwhile, the electromagnetic forces on non-impregnant NI REBCO coils, whose windings can be deformed separately with turns and moved easily, are complicated, and the detailed mechanism has not yet been clarified. Commonly, the circumferential movement/deformation of the winding is considered as a rigid body. In this study, we investigate the stresses and displacements due to the electromagnetic forces on NI REBCO pancake coils in high magnetic field using a current simulation and a 2D elastic finite element analysis in the radial and circumferential directions; i.e., each turn can individually move in the radial and circumferential directions considering the spiral winding structure. The simulation results show the circumferential movement/deformation of windings and the nonuniform hoop stress due to the electromagnetic force.

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Development of High Strength Pancake Coil With Stress Controlling Structure by REBCO Coated Conductor

Cited by 37 publications

References 7 publications

Promising effects of a new hat structure and double metal ring for mechanical reinforcement of a REBaCuO ring-shaped bulk during field-cooled magnetisation at 10 T without fracture

Promising effects of a new hat structure and double metal ring for mechanical reinforcement of a REBaCuO ring-shaped bulk during field-cooled magnetisation at 10 T without fracture

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Stress and Deformation Analysis of REBCO Pancake Coils With Individual Turn Movement

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