2 K Cryogenic system with the thermal switch for measuring electrical properties of insulation materials

Jia, Ping; Xu, Dong; Zhao, Yuchen; Qi, Haoying; Nishimura, A.; Liu, Huiming; Zhang, Hengcheng; Huang, Rongjin; Li, Laifeng

doi:10.1016/j.cryogenics.2021.103349

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…Liquid helium is pumped through the J-T valve into the He-II chamber (10), which is made of red copper. The pumping line (8) made of stainless steel 304 is used to remove the helium out of the He-II chamber.…”

Section: K Cryostat With the J-t Valvementioning

confidence: 99%

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Design and development of a cryogenic J-T valve for a 2 K cryostat with a single cryocooler

Wang,

Xu,

Jia

et al. 2024

J. Inst.

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A cryogenic Joule-Thomson (J-T) valve for a 2 K cryostat cooled with a G-M cryocooler has been developed to continuously supply superfluid helium. Saturated liquid helium flowing through the valve transitions to superfluid helium below 2 K because of the J-T effect. The heat leak, sealing performance and the J-T effect of the valve were tested experimentally and analyzed. To reduce heat leak in the 2 K range, two thermal anchors were installed in the first and second cooling stages, respectively, resulting in 89.93% reduction of useful work loss. A unique sealing structure was developed for the J-T valve and was tested at both room temperature and liquid nitrogen temperature, yielding leak rates of 3 × 10-9 Pa· m3/s and 3 × 10-4 Pa· m3/s, respectively. The corresponding valve needle and seat structure were designed based on the flow resistance equation. The J-T effect of the valve in 2 K cryostat was tested at various valve openings. The cryostat can operate at 1.64 K with no load and provide 0.143 W cooling power at 2 K.

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Section: K Cryostat With the J-t Valvementioning

confidence: 99%

“…This allowed the system to operate at 1.8 K for extended periods. Jia et al [10] constructed a system with a thermal switch to reduce precooling time, achieving it in 11.6 hours. To achieve lower temperature, Wang et al [11] developed a high-capacity 1 K cryocooler that includes an adjustable J-T valve.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a cryogenic J-T valve for a 2 K cryostat with a single cryocooler

Wang,

Xu,

Jia

et al. 2024

J. Inst.

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“…The electrical breakdown voltage of the nanocomposite was investigated by our self‐designed electrical breakdown equipment which according to IEC standard 60243–1:1998. [ 37 ] The impedance was measured by electrochemical workstation (CHI760e).…”

Section: Experiments Sectionmentioning

confidence: 99%

In situ synthesis of boron nitride “nanonoodles” based epoxy nanocomposites with enhanced thermal and dielectric properties

Miao

Wang

et al. 2022

Polymer Composites

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The development of low loading fraction nanoscale reinforcements that can be used to improve the dielectric and thermal properties of a polymer remains a challenge by the reason of the insurmountable difficulties with exfoliation and dispersion of polymer nanocomposites. Here, we combined noodle‐like boron nitride nanoribbons (BNNRs) with epoxy resin (EP) by a facile in situ synthesis. The hydroxyl and amino on the BNNRs surface can not only improve dispersibility but also conduct the formation of EP with BNNRs by the in situ ring‐opening reaction. The thermal behavior, dielectric properties, and thermal conductivity of BNNRs/EP nanocomposites with different BNNRs contents were investigated. At an extremely low BNNRs loading fraction of 1 wt%, the thermal conductivity of the nanocomposite increased 48%, which is attributed to the long continuous heat conduction path formed by the strong integration of BNNRs and EP. In addition, the electrical breakdown strength increased from 95.58 to 159.17 kV·mm−1 as the BNNRs content increased, while the nanocomposites maintained acceptable dielectric properties. The results indicate the potential for BNNRs as a new class of nanofiller for dielectric polymers.

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Investigation of temperature-dependent DC breakdown characteristics of nano-Al2O3/epoxy composites at low temperatures

Yan,

Jia,

Huang

et al. 2023

Cryogenics

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2 K Cryogenic system with the thermal switch for measuring electrical properties of insulation materials

Cited by 3 publications

References 10 publications

Design and development of a cryogenic J-T valve for a 2 K cryostat with a single cryocooler

Design and development of a cryogenic J-T valve for a 2 K cryostat with a single cryocooler

In situ synthesis of boron nitride “nanonoodles” based epoxy nanocomposites with enhanced thermal and dielectric properties

Investigation of temperature-dependent DC breakdown characteristics of nano-Al2O3/epoxy composites at low temperatures

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