Design and performance of multiloop and washer SQUIDs intended for sub-kelvin operation

Mikko Kiviranta; Jari S. Penttilä; Leif Grönberg; Juha Hassel; Antti Virtanen; Heikki Seppä

doi:10.1088/0953-2048/17/5/038

Design and performance of multiloop and washer SQUIDs intended for sub-kelvin operation

Mikko Kiviranta (Corresponding Author), Jari S. Penttilä, Leif Grönberg, Juha Hassel, Antti Virtanen, Heikki Seppä

Research output: Contribution to journal › Article

13 Citations (Scopus)

Abstract

We have developed a set of dc SQUIDs intended for frequency-domain multiplexed readout of transition edge sensor (TES) arrays. The first design is based on the Ketchen-style washer, and has exhibited a 1.2 × 10⁻⁷ Φ₀ Hz^1/2 flux noise both at 4.2 and 0.43 K. The second design is based on the multiloop structure and utilizes the spoke-terminating resistors which double as junction shunts in order to minimize the excess noise due to the resonance damping. The multiloop device has exhibited a 3.5 × 10⁻⁷ Φ₀ Hz^1/2 flux noise level at 4.2 K. The mutual inductances are chosen such that a typical ac-biased TES-based x-ray calorimeter would need only a moderate amount of negative feedback in order to handle the dynamic range of the signal.

Original language	English
Pages (from-to)	285 - 289
Number of pages	5
Journal	Superconductor Science and Technology
Volume	17
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/17/5/038
Publication status	Published - 2004
MoE publication type	A1 Journal article-refereed

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Keywords

SQUID
washer
transition edge sensor
bipolar transistors
superconducting transistors

Cite this

Kiviranta, M., Penttilä, J. S., Grönberg, L., Hassel, J., Virtanen, A., & Seppä, H. (2004). Design and performance of multiloop and washer SQUIDs intended for sub-kelvin operation. Superconductor Science and Technology, 17(5), 285 - 289. https://doi.org/10.1088/0953-2048/17/5/038

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abstract = "We have developed a set of dc SQUIDs intended for frequency-domain multiplexed readout of transition edge sensor (TES) arrays. The first design is based on the Ketchen-style washer, and has exhibited a 1.2 × 10−7 Φ0 Hz1/2 flux noise both at 4.2 and 0.43 K. The second design is based on the multiloop structure and utilizes the spoke-terminating resistors which double as junction shunts in order to minimize the excess noise due to the resonance damping. The multiloop device has exhibited a 3.5 × 10−7 Φ0 Hz1/2 flux noise level at 4.2 K. The mutual inductances are chosen such that a typical ac-biased TES-based x-ray calorimeter would need only a moderate amount of negative feedback in order to handle the dynamic range of the signal. ",

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AU - Virtanen, Antti

AU - Seppä, Heikki

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AB - We have developed a set of dc SQUIDs intended for frequency-domain multiplexed readout of transition edge sensor (TES) arrays. The first design is based on the Ketchen-style washer, and has exhibited a 1.2 × 10−7 Φ0 Hz1/2 flux noise both at 4.2 and 0.43 K. The second design is based on the multiloop structure and utilizes the spoke-terminating resistors which double as junction shunts in order to minimize the excess noise due to the resonance damping. The multiloop device has exhibited a 3.5 × 10−7 Φ0 Hz1/2 flux noise level at 4.2 K. The mutual inductances are chosen such that a typical ac-biased TES-based x-ray calorimeter would need only a moderate amount of negative feedback in order to handle the dynamic range of the signal.

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10.1088/0953-2048/17/5/038