Array of Superconducting Quantum Interference Devices with Multiturn Input Coil
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概要
- 論文の詳細を見る
Arrays of dc-superconducting quantum interference devices (dc-SQUIDs) were investigated, in which each dc-SQUID element has a multiturn input coil. The dependence of flux noise on the number of turns of the input coil was studied for current amplifiers. SQUID arrays were fabricated by a Nb/AlOx/Nb Josephson tunnel junction fabrication process. Results show that the flux noise of the SQUID array amplifier does not depend on the turn number of the input coil. A SQUID array amplifier consisting of 128 dc-SQUID elements was fabricated, in which each element had a 7-turn input coil and a mutual inductance between the input coil and the SQUID loop of 460 pH. This amplifier showed an ultrahigh current resolution of 1 pA/Hz0.5 and a maximum input current of 11 μA for signals of 50 kHz, which is sufficient bandwidth for X-ray detection applications. These values correspond to a large dynamic range of 87 dB. The flux-voltage characteristics of this SQUID array, however, showed asymmetric behavior, which originated from electronic resonance in stray capacitance and the mutual inductance between the SQUID loop and the multiturn input coil.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-05-15
著者
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MOROOKA Toshimitsu
Seiko Instruments Inc.
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Myoren Hiroaki
Department Of Electrical And Electronic Systems Faculty Of Engineering Saitama University
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CHINONE Kazuo
Seiko Instruments Inc.
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Takada Susumu
Department Of Chemistry Faculty Of Science Shizuoka University
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Takada Susumu
Department of Electrical and Electronic Systems, Faculty of Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
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Myoren Hiroaki
Department of Electrical and Electronic Systems, Faculty of Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
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