使用直流squid进行超低温核磁共振检测

Applied Superconductivity Pub Date : 1999-10-01 DOI:10.1016/S0964-1807(99)00038-1

S.L. Thomasson , C.M. Gould

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引用次数: 3

摘要

超低温条件下的核磁共振实验对超导量子干涉器件(SQUID)放大器提出了很高的要求。我们开发了一种合适的直接耦合读出SQUID电子系统，该系统利用额外的正反馈(APF)，并实现了5 MHz的系统带宽，14 kHz时的最大转换速率1.3×107 Φ0/s和3.4 μΦ0/Hz的白噪声电平。我们还研究了通过使用低噪声直流SQUID串联阵列和将SQUID放大器放置在更靠近超低温实验的位置来提高信噪比的方法。我们将讨论如何配置SQUID放大器，使其在T≪1 K下工作。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Ultralow temperature NMR detection using dc SQUIDs

Nuclear magnetic resonance (NMR) experiments at ultralow temperatures place high demands on superconducting quantum interference device (SQUID) amplifiers. We have developed a suitable direct-coupled readout SQUID electronics system, which utilizes additional positive feedback (APF), and have achieved a system bandwidth of 5 MHz, maximum slew rate of 1.3×10⁷ Φ₀/s at 14 kHz and a white noise level of 3.4 μΦ₀/ $Hz$ . We have also investigated improving the signal-to-noise ratio by using a low noise series array of dc SQUIDs and by placing the SQUID amplifier closer to the ultralow temperature experiment. We will discuss how we have configured our SQUID amplifiers for operation at T≪1 K.

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Applied Superconductivity

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