英国物理学会
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作者:Naoyuki Amemiya , Tadaaki Tsukamoto ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2014, Vol.27 (3)IOP
摘要:The three-dimensional structure of Roebel cables consisting of coated conductors influences their ac loss characteristics. Measurements of the ac loss and numerical electromagnetic field analyses were carried out using a six-strand Roebel cable as well as several reference c...
作者:... Kent Hamilton , Robert G Buckley , Naoyuki Amemiya
来源:[J].Superconductor Science and Technology(IF 2.758), 2014, Vol.27 (7)IOP
摘要:A Roebel cable is a good candidate for low-voltage windings in a high-temperature superconductor (HTS) transformer because of its high current-carrying capability and low AC loss. Transport AC loss measurements were carried out in 1.8 m long 15/5 (fifteen 5 mm wide strands) and 1...
作者:Naoyuki Amemiya , Hiroaki Otake ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2015, Vol.28 (3)IOP
摘要:To study the influence of coated-conductor magnetization on the field quality of accelerator magnets, we made a small dipole magnet consisting of four racetrack coils wound with GdBCO coated conductors and measured its magnetic field in liquid nitrogen by using rotating pick...
作者:Naoyuki Amemiya , Naoki Tominaga ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2018, Vol.31 (2)IOP
摘要:The shielding-current-induced field is a serious concern for the applications of coated conductors to magnets. The striation of the coated conductor is one of the countermeasures, but it is effective only after the decay of the coupling current, which is characterised with the co...
作者:... Hae-Jin Sung , Nicholas J Long , Naoyuki Amemiya
来源:[J].Superconductor Science and Technology(IF 2.758), 2015, Vol.28 (11)IOP
摘要:HTS flux pumps enable superconducting currents to be directly injected into a magnet coil without the requirement for thermally inefficient current leads. Here, we present results from an experimental mechanically rotating HTS flux pump employing a coated-conductor stator and ope...
作者:... Taketsune Nakamura , Toru Ogitsu , Naoyuki Amemiya
来源:[J].Superconductor Science and Technology(IF 2.758), 2016, Vol.29 (4)IOP
摘要:We carried out electromagnetic field analyses on the cross sections of two dipole magnets wound with coated conductors. One was a cosine-theta magnet, and the other was a block design magnet. The electric field–current density characteristics of the coated conductors were fo...
作者:... Chris W Bumby , Robert G Buckley , Naoyuki Amemiya
来源:[J].Superconductor Science and Technology(IF 2.758), 2016, Vol.29 (9)IOP
摘要:Both AC loss and wire cost in coil windings are critical factors for high temperature superconductor (HTS) AC machinery applications. We present AC loss measurement results in three HTS coil assemblies at 77 K and 65 K which have a hybrid coil structure comprising one central win...
作者:Naoyuki Amemiya , Xingyou Zhang
来源:[J].Superconductor Science and Technology(IF 2.758), 2017, Vol.30 (3)IOP
摘要:Superconducting high- T c coated conductor (CC) wires comprise a ceramic thin film with a large aspect ratio. This geometry can lead to significant dissipative losses when exposed to an alternating magnetic field. Here we report experimental measurements of the ‘d...
作者:... Jin Fang , Naoyuki Amemiya , Chris W Bumby
来源:[J].Superconductor Science and Technology(IF 2.758), 2018, Vol.31 (3)IOP
摘要:Dynamic resistance, which occurs when a HTS coated conductor carries a DC current under an AC magnetic field, can have critical implications for the design of HTS machines. Here, we report measurements of dynamic resistance in a commercially available SuperPower 4 mm-wide YB...
作者:... Zhenan Jiang , Ryuki Toyomoto , Naoyuki Amemiya
来源:[J].Superconductor Science and Technology(IF 2.758), 2018, Vol.31 (7)IOP
摘要:The use of superconducting wire within AC power systems is complicated by the dissipative interactions that occur when a superconductor is exposed to an alternating current and/or magnetic field, giving rise to a superconducting AC loss caused by the motion of vortices withi...

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