Improving the stability of cryogenic current comparator setups

被引：25

作者：

Drung, D. ^{[1
]}

Goetz, M. ^{[2
]}

Pesel, E. ^{[2
]}

Storm, J. -H ^{[1
]}

Assmann, C. ^{[1
]}

Peters, M. ^{[1
]}

Schurig, Th ^{[1
]}

机构：

[1] Phys Tech Bundesanstalt, D-10587 Berlin, Germany

[2] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2009年 / 22卷 / 11期

关键词：

SQUIDs;

D O I：

10.1088/0953-2048/22/11/114004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 M Omega. 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.

引用

页数：8

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