AC Defluxing of SQUIDs
AC Defluxing of SQUIDs
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SQUID 的交流去焊剂
DOI：
10.1109/tasc.2017.2650902
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发表时间：
2017
影响因子：
1.8
通讯作者：
W. Anderson
中科院分区：
文献类型：
--
作者：
A. Matlashov;V. Semenov;W. Anderson
磁通量捕获是基于 SQUID 的仪器和超导电子设备中一个非常严重的问题。 A critical consideration for avoiding flux trapping is a prevention of SQUID sensors or circuits from being exposed to magnetic fields.不幸的是，如果传感器必须暴露在强磁场或瞬变中，则无法应用此措施。例如，在使用非屏蔽薄膜平面 SQUID 传感器的超低场磁共振成像和超顺磁弛豫测量中，不可避免地会发生暴露。 SQUID 传感器在暴露于强度仅为几 mT 的磁场后就会停止工作。早些时候，我们报道了使用强衰减交流磁脉冲对平面 LTS SQUID 梯度计进行去磁通的成功结果。 In this paper, we present further experimental results and discuss a possible mechanism to explain the observed defluxing effects.与传统的热循环相比，新的交流去焊剂技术速度更快，消耗的能量也少得多。
Magnetic flux trapping is a very serious problem in SQUID-based instrumentation and superconducting electronics. A critical consideration for avoiding flux trapping is a prevention of SQUID sensors or circuits from being exposed to magnetic fields. Unfortunately, this measure cannot be applied, if sensors must be exposed to a strong magnetic field or transients. For example, unavoidable exposures take place in ultralow field magnetic resonance imaging and superparamagnetic relaxation measurements using unshielded thin-film planar SQUID sensors. SQUID sensors stop working after being exposed to magnetic fields of only a few mT in strength. Earlier, we reported successful results of defluxing of planar LTS SQUID-gradiometers using strong decaying ac magnetic pulses. In this paper, we present further experimental results and discuss a possible mechanism to explain the observed defluxing effects. The new ac defluxing technique is much faster and dissipates much less energy than a conventional thermal cycling.
影响因子：
2.2
作者：
Zotev, Vadim S.;Matlashov, Andrei N.;Kraus, Robert H., Jr.
通讯作者：
Kraus, Robert H., Jr.