Active suppression of temperature oscillation from a pulse-tube cryocooler in a cryogen-free cryostat: Part 1. Simulation modeling from thermal response characteristics

Pan, Changzhao; Gao, Bo; Song, Yaonan; Zhang, Haiyang; Han, Dongxu; Hu, Jianxing; Liu, Wenjing; Chen, Hui; Plimmer, Mark; Sparasci, F.; Luo, Ercang; Pitre, Laurent

doi:10.1016/j.cryogenics.2020.103097

Cited by 4 publications

(5 citation statements)

References 24 publications

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“…In addition, a custom-made thermal link (estimated thermal resistance 3.3 K•W −1 [29]) and a gas-type heat-switch (using 4 He at around 10 Pa [29]) were used to damp the temperature oscillation from the cryocooler. For thermal regulation, we developed a novel active control temperature oscillation method [30,31] to stabilize the temperature at the microkelvin level from 5 K to 25 K. In addition, to reduce the heat loss from the pressure tube and microwave cable, heat-sinks were used wherever these components passed through a flange. In this way, the main element, the microwave resonator, can be cooled to as low as 4.3 K with no apparent temperature oscillation (for SPRIGT, measurements were all made above 5 K to avoid pre-condensation effects [32]).…”

Section: Cryostatmentioning

confidence: 99%

Measurement of thermodynamic temperature between 5 K and 24.5 K with single-pressure refractive-index gas thermometry

et al. 2020

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We describe measurements of thermodynamic temperature in the range 5 K to 24.5561 K (the triple point of neon) using single-pressure refractive-index gas thermometry (SPRIGT) with 4He. In the wake of the May 2019 re-definition of the kelvin and its associated mise en pratique, the main purpose of the work is to provide values of T–T 90, the discrepancy between thermodynamic temperature and that of the International Temperature Scale of 1990 (ITS-90). The link to ITS-90 is made via calibrated rhodium-iron resistance thermometers. Innovations required to reach the level of accuracy required for meaningful measurements (uncertainty in T–T 90 less than the expected deviation) include the suppression of temperature oscillations in a cryogen-free cryostat, a pressure stabilization scheme based on a non-rotating piston balance, modelling of the hydrostatic head correction and refinements of the measurement of microwave resonances in a quasi-spherical copper resonator. The accuracy of measurements varies from 0.05 mK to 0.17 mK and is competitive with that of all previous ones in this temperature range using other techniques. The improvement stems partly from the new techniques used for the new definition of the kelvin as well as ab initio calculations of the thermophysical properties ofgaseous 4He. In addition to confirming the validity of SPRIGT as an accurate, easier-to-implement alternative to other low-temperature primary thermometry techniques (e.g. acoustic gas thermometry) yet with scope for improvement, the results should provide important input data for any future revision of ITS-90.

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Section: Cryostatmentioning

confidence: 99%

Measurement of thermodynamic temperature between 5 K and 24.5 K with single-pressure refractive-index gas thermometry

et al. 2020

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“…As proposed in the companion paper [14], active suppression is performed by adding an appropriate oscillating heat source to the heat generated by a proportional-integral (PI) controller. To implement the method, however, two practical problems needed to be solved.…”

Section: Implementation Strategymentioning

confidence: 99%

“…Recently, we developed a simulation model using the thermal response characteristics of a cryogen-free cryostat [14]. It revealed that PI feedback alone cannot remove the unwanted temperature modulation.…”

Section: Introductionmentioning

confidence: 99%

“…Here we describe its experimental implementation and results obtained. The numerical values used in the theoretical companion paper [14] relate to a cryostat installed at the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences (TIPC-CAS). For practical reasons, the method was implemented experimentally at LCM-LNE-Cnam in France.…”

Section: Introductionmentioning

confidence: 99%

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Active suppression of temperature oscillation from a pulse-tube cryocooler in a cryogen-free cryostat: Part 2. Experimental realization

Pan

Zhang

et al. 2020

Cryogenics

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“…To reduce the perturbation from the surroundings still further, a laboratory with good room temperature regulation was constructed. Besides, a novel active control temperature oscillation method was developed [24,25].…”

Section: Cryostat For Sprigtmentioning

confidence: 99%

Investigation of High-Stability Temperature Control in Primary Gas Thermometry

Zhang

Song

et al. 2022

J. Therm. Sci.

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We present a relationship between the temperature control and measurement stability limit and its temperature resolution, particularly for using rhodium-iron resistance thermometers and AC resistance bridges.Based on which, temperature control was investigated and demonstrated in primary gas thermometry at various working conditions. With optimized parameters, micro-kelvin level temperature control stability was realized in the temperature region from 5 K to 24.5 K. The temperature control stabilities are better than 8 K over 180 h with an integration time of 33.6 s in the concerned temperature range, closing to the limit that the sensors and the instruments can control and measure. These stabilities were improved about (44 ± 8) % at 24.5 K and (70 ± 7) % at 5 K comparing with our previous work (Chen et al., Cryogenics 2019 97 1-6).

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Active suppression of temperature oscillation from a pulse-tube cryocooler in a cryogen-free cryostat: Part 1. Simulation modeling from thermal response characteristics

Cited by 4 publications

References 24 publications

Measurement of thermodynamic temperature between 5 K and 24.5 K with single-pressure refractive-index gas thermometry

Measurement of thermodynamic temperature between 5 K and 24.5 K with single-pressure refractive-index gas thermometry

Active suppression of temperature oscillation from a pulse-tube cryocooler in a cryogen-free cryostat: Part 2. Experimental realization

Investigation of High-Stability Temperature Control in Primary Gas Thermometry

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