研究目的
To determine the thermodynamic temperature of helium gas filled in a quasi-spherical microwave cavity resonator (QMCR) using a novel single pressure refractive index gas thermometry (SPRIGT) method, combining microwave measurements, temperature, and pressure control.
研究成果
The SPRIGT experiment system has been established, and the first run experimental data was analyzed. Future improvements in microwave resonance frequency measurement, temperature, and pressure control are expected to achieve the final accuracy target of SPRIGT.
研究不足
The system currently reaches a lowest temperature of 5.65K with temperature oscillations reduced to 1mK. The thermal resistance of the three horizontal tubes is not long enough, indicating areas for optimization in thermal links.
1：Experimental Design and Method Selection:
The SPRIGT method involves microwave resonance frequency measurements in a QMCR with precise control of gas pressure and temperature.
2：Sample Selection and Data Sources:
High purity helium-4 is used as the working gas in the QMCR.
3：List of Experimental Equipment and Materials:
Includes a quasi-spherical microwave cavity resonator, a two-stage pulse tube cryocooler, thermal links, a thermal switch cavity, and distributed temperature sensors and heaters.
4：Experimental Procedures and Operational Workflow:
The system is designed to achieve stable temperatures from 5K to
5：5561K, with pressure control and measurement via a piston gauge and a flowing gas system. Data Analysis Methods:
Microwave resonance frequency measurements are analyzed with an uncertainty target below 1.8ppb.
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