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1:30000 cryogenic current comparator with optimum SQUID readout
G. Rietveld;E. Bartolome;J. Sese;P. de la Court;J. Flokstra;C. Rillo;A. Camon
We have developed a 1:30000 winding ratio cryogenic current comparator (CCC) for measurement of small currents, e.g., generated by a single electron transport device. A dedicated low-noise SQUID is used for the readout, which allows reaching a sensitivity close to ideal, that is without loss of sensitivity in the flux transformer coupling the CCC and the SQUID. The CCC-SQUID equivalent current inp...Show More
Simplified calculus for the design of a cryogenic current comparator
J. Sese;E. Bartolome;A. Camon;J. Flokstra;G. Rietveld;C. Rillo
The calculation of inductances of superconducting structures like the cryogenic current comparator (CCC) is not straightforward due to image effects and unknown current distributions. By treating the problem as a magnetic circuit, an approximate analytical expression for the self-inductance of the shielded CCC is obtained. This formula can be used to derive a "rule of thumb" for maximizing the val...Show More
1:30000 cryogenic current comparator with optimum squid readout
E. Bartolome;J. Sese;G. Rietveld;J. Flokstra;C. Rillo;A. Camon;H. Rogalla
Conference Digest Conference on Precision Electromagnetic Measurements
Year: 2002 | Conference Paper |
Cited by: Papers (2)
We developed a 1:30000 Cryogenic Current Comparator for SET current amplification. A dedicated low-noise, directly-coupled SQUID was used for the readout, which allowed reaching a sensitivity close to ideal. The ratio error was <9/spl times/10/sup -9/. The CCC-SQUID equivalent current input noise was 3.0 fA/Hz/sup 1/2/, measured down to 0.1 Hz.Show More
Simplified calculus for the design of a cryogenic current comparator
J. Sese;E. Bartolome;A. Camon;J. Flokstra;G. Rietveld;C. Rillo
Conference Digest Conference on Precision Electromagnetic Measurements
Year: 2002 | Conference Paper |
The calculation of inductances of superconducting structures like the cryogenic current comparator (CCC) is not straightforward due to image effects. We have found a "rule of thumb" that maximizes the value of an inductance inside a superconducting shield. With this rule, the design of an optimum CCC is simplified.Show More
Resistance bridge based on the cryogenic current comparator in a transport dewar
E. Bartolome;A. Camon;J. Sese;C. Rillo;J. Flokstra;G. Rietveld;H. Rogalla
An optimized resistance bridge based on the Cryogenic Current Comparator (CCC) with SQUID readout has been developed. The bridge can be used for routine secondary resistance calibrations as well as for the traceability of 100 /spl Omega/ to the quantum Hall resistance. The CCC-SQUID, shielding and wiring are mounted in a telescopic insert, fitted in a low-evaporation rate, transportable liquid He ...Show More
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