Helium-Gas-Cooled Cryogenic Current Comparator Integrated with a Quantum Resistance Standard

Abstract

We report a cryogen-free cryogenic current comparator (CCC) system for precision resistance measurements. A helium-gas chamber was developed and installed on the 4 K stage of a cryogen-free dilution refrigerator equipped with a pulse-tube cryocooler. The CCC probe was housed in this chamber and was cooled through helium gas serving as a heat exchange medium. The metrological performance of this helium-gas-cooled CCC was evaluated through precision resistance-ratio measurements and found to be comparable to that obtained under liquid-helium cooling. A quantum Hall resistance (QHR) device was also integrated into the same refrigerator, enabling QHR/100~Ω resistance-ratio measurements. The type-A uncertainty reached the 1~nΩ/Ω level within an averaging time of 100~s, and the resulting resistance-ratio measurements agreed well with conventional liquid-helium-based measurements at the level of a few nΩ/Ω. The system provides this level of measurement performance while consuming less than 1~L of helium gas per thermal cycle.

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BibTeX RIS

BibTeX

@misc{okazaki2026heliumgascooled,
  title = {{Helium-Gas-Cooled Cryogenic Current Comparator Integrated with a Quantum Resistance Standard}},
  author = {Yuma Okazaki and Takehiko Oe and Nobu-Hisa Kaneko},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.01124},
  eprint = {2609.01124},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.01124},
}

RIS

TY  - UNPB
TI  - Helium-Gas-Cooled Cryogenic Current Comparator Integrated with a Quantum Resistance Standard
AU  - Yuma Okazaki
AU  - Takehiko Oe
AU  - Nobu-Hisa Kaneko
PY  - 2026
DA  - 2026/09/01
PB  - arXiv
DO  - 10.48550/arxiv.2609.01124
UR  - https://arxiv.org/abs/2609.01124
AB  - We report a cryogen-free cryogenic current comparator (CCC) system for precision resistance measurements. A helium-gas chamber was developed and installed on the 4 K stage of a cryogen-free dilution refrigerator equipped with a pulse-tube cryocooler. The CCC probe was housed in this chamber and was cooled through helium gas serving as a heat exchange medium. The metrological performance of this helium-gas-cooled CCC was evaluated through precision resistance-ratio measurements and found to be comparable to that obtained under liquid-helium cooling. A quantum Hall resistance (QHR) device was also integrated into the same refrigerator, enabling QHR/100~Ω resistance-ratio measurements. The type-A uncertainty reached the 1~nΩ/Ω level within an averaging time of 100~s, and the resulting resistance-ratio measurements agreed well with conventional liquid-helium-based measurements at the level of a few nΩ/Ω. The system provides this level of measurement performance while consuming less than 1~L of helium gas per thermal cycle.
ER  -

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