Improving the stability of cryogenic current comparator setups

Improving the stability of cryogenic current comparator setups

We have realized an improved resistance calibration setup based on a cryogenic current comparator (CCC). The comparator, with 18 windings and 4647 turns in total, is well-suited for all the necessary comparisons with a 100 Omega standard resistor with the quantum Hall effect and inside the range of...

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Veröffentlicht in:Superconductor science & technology 2009-11, Vol.22 (11), p.114004-114004 (8)
Hauptverfasser: Drung, D, Götz, M, Pesel, E, Storm, J-H, Aßmann, C, Peters, M, Schurig, Th
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container_end_page 114004 (8)
container_issue 11
container_start_page 114004
container_title Superconductor science & technology
container_volume 22
creator Drung, D
Götz, M
Pesel, E
Storm, J-H
Aßmann, C
Peters, M
Schurig, Th
description We have realized an improved resistance calibration setup based on a cryogenic current comparator (CCC). The comparator, with 18 windings and 4647 turns in total, is well-suited for all the necessary comparisons with a 100 Omega standard resistor with the quantum Hall effect and inside the range of standard resistance values from 1 Omega to 1 MOmega. The new state-of-the-art setup is equipped with a low-noise dc SQUID (superconducting quantum interference device) and a digital double current source. Proper damping of the CCC resonance, careful electronics design ('box-in-box') and application of internal wideband feedback to the SQUID sensor improve the dynamic stability considerably and lower the overall measurement time as compared against our previous setup.
doi_str_mv 10.1088/0953-2048/22/11/114004
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title Improving the stability of cryogenic current comparator setups
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