Flux Trapping in Superconducting Circuits

Polyakov, Yu. A.; Narayana, Supradeep; Семенов, В.К.

doi:10.1109/tasc.2007.898707

Cited by 34 publications

(17 citation statements)

References 19 publications

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“…Our data and consideration of theoretical boundaries suggest that this new strategy can be generalized to other stimulation protocols as long as the electromagnetic interference from the stimulator does not exceed the dynamic recording range and maximum slew rate of the MEG system. Strong magnetic fields close to the SQUIDS can cause magnetic flux trapping 47 , an issue that requires caution, as degradation of the SQUID sensors can result. The MEG that was used for the study was a CTF 275-sensor whole-head MEG system with a dynamic recording range of 192 dB.…”

Section: Discussionmentioning

confidence: 99%

In vivo assessment of human brain oscillations during application of transcranial electric currents

et al. 2013

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Brain oscillations reflect pattern formation of cell assemblies’ activity, which is often disturbed in neurological and psychiatric diseases like depression, schizophrenia and stroke. In the neurobiological analysis and treatment of these conditions, transcranial electric currents applied to the brain proved beneficial. However, the direct effects of these currents on brain oscillations have remained an enigma because of the inability to record them simultaneously. Here we report a novel strategy that resolves this problem. We describe accurate reconstructed localization of dipolar sources and changes of brain oscillatory activity associated with motor actions in primary cortical brain regions undergoing transcranial electric stimulation. This new method allows for the first time direct measurement of the effects of non-invasive electrical brain stimulation on brain oscillatory activity and behavior.

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Section: Discussionmentioning

confidence: 99%

In vivo assessment of human brain oscillations during application of transcranial electric currents

et al. 2013

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“…We would like to draw attention to one more problem which is specific to superconductor electronics, flux trapping [16]. Our investigations showed that almost every cell is affected by flux trapping.…”

Section: Experimentationmentioning

confidence: 92%

Decimation Filter With Improved DC Biasing and Data Transfer

Inamdar

Sahu

Семенов

2007

IEEE Trans. Appl. Supercond.

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Decimation filters are still the most complex and valuable superconductor digital circuits, so it is natural to use them to compare different design techniques. In the paper we discuss two new techniques. The first deals with the DC biasing scheme. For debugging purposes it is convenient to use separate power lines for different functional blocks. However, the lines occupy extra space, which could be unacceptable for a final design, when the decimation filters become part of larger circuits, for example, low-pass or band-pass ADCs. We will discuss an efficient rewiring technique that saves space during the connection of separate power lines after the circuit is debugged. The second technique is a selective use of micro-strip lines. Our solution contrasts with "extreme" recommendations for micro-strip lines as a universal tool for inter cell connections. More specifically for each connection we select either Josephson transmission or micro-strip line connection to keep the occupied area as small as possible. This highly "custom" design is possible due to parametric cell technique that dramatically accelerates the design procedure. In particular, we easily converted the circuit initially developed for 1 kA/cm2 standard HYPRES technology to the advanced technology with higher (4.5 kA cm 2 ) critical current density.The filter has 20 GHz and 40 GHz target sampling frequencies for 1kA/cm2 and 4.5 kA cm 2 fabrication processes respectively.The circuits are fully operational at low frequency.

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“…Rectangular windows, so called moats, are introduced into the ground plane to alleviate the problem by providing a channel for the magnetic field [5]. Layout rules for these moats were derived in [6], [7], but it was also revealed, [8] that fabrication imperfections have a considerable influence on the effectiveness of the moats, since imperfections promote flux pinning.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of Flux Trapping on the Operation of RSFQ Circuits

Ebert

Ortlepp

Uhlmann

2009

IEEE Trans. Appl. Supercond.

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This paper investigates the robustness of different ground plane configurations of superconducting circuits against magnetic flux trapping. The robustness of the circuit is determined by the change of the error rate at a specific operating point under the influence of an external magnetic field. A large number of thermocycles are used to determine the statistic properties of the error rate. The proposed measurement setup allows a fast scan of a two-dimensional operating area.

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Flux Trapping in Superconducting Circuits

Cited by 34 publications

References 19 publications

In vivo assessment of human brain oscillations during application of transcranial electric currents

In vivo assessment of human brain oscillations during application of transcranial electric currents

Decimation Filter With Improved DC Biasing and Data Transfer

Experimental Study of the Effect of Flux Trapping on the Operation of RSFQ Circuits

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