The Characteristics of Bi-2223/Ag Conductor for High Field Application

Choi, Seyong; Toko, Kiyoshi; Matsumoto, Shinji; Itoh, K.; Hase, Takashi; Zaitsu, Kyoji; Hamada, Mamoru; Sugano, M.

doi:10.1109/tasc.2008.922354

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…The anisotropy, I c (B k )/I c (B \ ), is less than 2 at 2 T and decreases with field to 1.5 at 17 T, similarly to the reported behaviour of Bi-based filamentary tapes [31,32]. The measurements in high fields beyond 24 T were affected by the anomalous behaviour discussed in [33,34] while ramping down the field, that we could not determine I c definitively on the ramp down leg. For this reason, only the data from ramp up leg are shown above 24 T in Fig.…”

Section: Bi-2223 Conductorsupporting

confidence: 46%

High field Ic characterizations of commercial HTS conductors

Miyoshi¹,

Nishijima

Kitaguchi

et al. 2015

Physica C: Superconductivity and its Applications

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Section: Bi-2223 Conductorsupporting

confidence: 46%

High field Ic characterizations of commercial HTS conductors

Miyoshi¹,

Nishijima

Kitaguchi

et al. 2015

Physica C: Superconductivity and its Applications

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“…[20] It should be noted that, the HTS material can be reverted to its normal condition (no superconductivity exhibition), if any of the three mentioned restrictions is exceeded. Therefore, the complete specifications of the applied HTS material layer which are given in Table 2, [21,22] seem to be essential. It should be noted that, the operating temperature of the specified HTS material is at 77K which is known as the liquid nitrogen temperature.…”

Section: Specifications Of the Studied Motormentioning

confidence: 99%

Performance Improvement of a Slotted Solid Rotor Induction Motor with High Temperature Superconder Coating

Azari

2019

IJE

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A B S T R A C TThis paper analyzes an induction motor with high temperature superconducter (HTS) coated slotted solid rotor. By slotting the solid rotor, the electromagnetic torque near synchronous speed will increase but the starting torque will decrease. To improve starting torque, rotor slots are coated with HTS materials. Using HTS material vary the rotor resistance to great extends in starting step and this means the starting torque will be maximized. Also the torque near synchronous speed will be higher than before because of the resistance of the HTS is completely zero in this period. This would help the torque become more than the case without any coating. It is concluded that, HTS coating of slotted solid rotor will increase the starting torque by 42 and 74% than smooth type rotor and slotted one, respectively. For case-study motor, the torque near synchronous speed these improvements were 75% and 33%, respectively. The performance of the proposed motor is simulated using finite element method (FEM).

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“…The results of high current type conductors are reported in [16]. We had planned to wind the coils by stacking double-pancakes; however, the data of the SUS-reinforced Bi-2223 shown in Fig.…”

Section: B Development Of Hts Coilsmentioning

confidence: 99%

NMR Upgrading Project Towards 1.05 GHz

Toko

Otsuka

Choi

et al. 2008

IEEE Trans. Appl. Supercond.

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An NMR spectrometer over 1 GHz requires the contribution of high-c superconductors (HTS). However, a persistent-mode operation with HTS cannot satisfy the field stability of 0.01 ppm/h at present. This is a great barrier for applying HTS to an NMR magnet. To overcome this problem, a new project was undertaken in Japan in October 2006. In the course of the project, we will develop a highly stabilized power supply, field-compensation methods, and measurement techniques that allow a certain field fluctuation. By integrating them, the feasibility of HTS to NMR will be demonstrated. We performed a long-term operation of a 600 MHz NMR magnet in the driven-mode. Allowable field fluctuation of the existing internal lock system for solution NMR was evaluated by a model experiment. As the next step, the innermost Nb 3 Sn coil of the 600 MHz NMR magnet will be replaced with a Bi-2223 coil, and the field homogeneity, as well as the field stability, will be evaluated. In the final step of the project, the replacement of the innermost coil of the existing 920 MHz NMR magnet will be planned. The targeting field is 24.7 T (1.05 GHz for 1 H NMR resonance frequency). The solid-state NMR on 17 O nuclei in a labeled peptide will be demonstrated using a magic angle spinning probe; the probe has a 1 H decoupling frequency of 1.05 GHz.Index Terms-Field stability, high magnetic field, high temperature superconductor, NMR spectrometer.

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The Characteristics of Bi-2223/Ag Conductor for High Field Application

Cited by 8 publications

References 9 publications

High field Ic characterizations of commercial HTS conductors

High field Ic characterizations of commercial HTS conductors

Performance Improvement of a Slotted Solid Rotor Induction Motor with High Temperature Superconder Coating

NMR Upgrading Project Towards 1.05 GHz

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