Optimization of a Low-Tc DC SQUID Amplifier With Tightly Coupled Input Coils

Pleikies, J.; Usenko, O.; Frossati, G.; Flokstra, Jakob

doi:10.1109/tasc.2009.2019662

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…The reported SQUIDs exhibit very low white input current noise levels down to 65 fA Hz -1/2 , which is lower than previously reported comparable integrated thin film current sensor SQUIDs [8,24,25]. A further increase of N by i.e.…”

Section: Sensor Performancementioning

confidence: 62%

A new family of field-stable and highly sensitive SQUID current sensors based on sub-micrometer cross-type Josephson junctions

Schmelz¹,

Zakosarenko²,

Schönau³

et al. 2017

Supercond. Sci. Technol.

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We report on the development of a new family of SQUID current sensors based on sub-micron crosstype Josephson tunnel junctions. Their low total junction capacitance permit high usable voltage swings of more than 100 µV and exceptional low noise of the SQUIDs at 4.2 K. Integrated rf-filter as well as high tolerable background fields during cool-down of up to 9.6 mT enable their highly reliable and easy use. With input coil inductances ranging from 10 nH to 2.8 µH and current sensitivities and coupled energy resolution down to 65 fA/Hz 1/2 and below 10 h, respectively, they are a versatile tool for numerous applications. _________________________________________________________________________________________________

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Section: Sensor Performancementioning

confidence: 62%

A new family of field-stable and highly sensitive SQUID current sensors based on sub-micrometer cross-type Josephson junctions

Schmelz¹,

Zakosarenko²,

Schönau³

et al. 2017

Supercond. Sci. Technol.

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show abstract

“…Such value is about a factor two less than the noise of other SQUIDs of the same category. [12][13][14] As an application the device has been employed to measure the Nyquist noise of integrated test resistors by using the current sensing noise thermometer technique (CSNT). 6 The signal coil is closed on an integrated test resistor; the corresponding Nyquist current noise flowing in the signal coil induces a magnetic flux noise in the SQUID which is equal to…”

Section: Experimental Performance and Application Examplementioning

confidence: 99%

An ultralow noise current amplifier based on superconducting quantum interference device for high sensitivity applications

Granata

Vettoliere

Russo

2011

Review of Scientific Instruments

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An integrated ultrahigh sensitive current amplifier based on a niobium dc superconducting quantum interference device (SQUID) has been developed. The sensor design is based on a multiturn signal coil coupled to a suitable SQUID magnetometer. The signal coil consists of 60 square niobium turns tightly coupled to a superconducting flux transformer of a SQUID magnetometer. The primary coil (pick-up coil) of the flux transformer has been suitably designed in order to accommodate the multiturn input coil. It has a side length of 10 mm and a width of 2.4 mm. In such a way we have obtained a signal current to magnetic flux transfer coefficient (current sensitivity) as low as 62 nA∕Φ(0). The sensor has been characterized in liquid helium by using a direct coupling low noise readout electronic and a standard modulated electronic in flux locked loop configuration for the noise measurements. Beside the circuit complexity, the sensor has exhibited a smooth and free resonance voltage-flux characteristic guaranteeing a reliable and a stable working operation. Considering a SQUID magnetic flux noise of S(Φ)(1∕2) = 1.8 μΦ(0)∕Hz(1∕2) at T = 4.2 K, a current noise as low as 110 fA∕Hz(1∕2) is obtained. Such a value is about a factor two less than the noise of other SQUIDs of the same category. As an application, Nyquist noise measurements of integrated test resistors using the current sensing noise thermometer technique are reported. Due to its high performance such a sensor can be employed in all applications requiring an extremely current sensitivity like the readout of the gravitational wave detectors and the current sensing noise thermometry.

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“…We numerically investigate the behavior of a simplified model of such SQUIDs. The results are used to give some guidelines for the operation and design of such sensors [15,34]. In the final part of chapter 3 we present a numerical experiment of a standard SQUID strongly coupled to a capacitive input circuit.…”

Section: Motivation and Overview Of The Thesismentioning

confidence: 99%

“…The final chapter 5 shows measurements on our developed SQUIDs for an optimized readout of MiniGRAIL [34][35][36]. We describe the design, modeling and experiments of the developed sensors.…”

Section: Motivation and Overview Of The Thesismentioning

confidence: 99%

Strongly coupled, low noise dc-SQUID amplifiers

Pleikies¹

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Optimization of a Low-Tc DC SQUID Amplifier With Tightly Coupled Input Coils

Cited by 6 publications

References 22 publications

A new family of field-stable and highly sensitive SQUID current sensors based on sub-micrometer cross-type Josephson junctions

A new family of field-stable and highly sensitive SQUID current sensors based on sub-micrometer cross-type Josephson junctions

An ultralow noise current amplifier based on superconducting quantum interference device for high sensitivity applications

Strongly coupled, low noise dc-SQUID amplifiers

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