1. Thermal response characteristics of a SPRIGT primary thermometry system
- Author
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Pan Changzhao, Laurent Pitre, Yaonan Song, Haiyang Zhang, M.D. Plimmer, F. Sparasci, Wenjing Liu, Ercung Luo, Hui Chen, Bo Gao, Chen Yanyan, and Dongxu Han
- Subjects
010302 applied physics ,Cryostat ,Materials science ,Physics::Instrumentation and Detectors ,Oscillation ,business.industry ,General Physics and Astronomy ,Cryogenics ,Cryocooler ,01 natural sciences ,Working range ,Optics ,Heat flux ,0103 physical sciences ,Thermal ,General Materials Science ,010306 general physics ,business ,Pulse tube refrigerator - Abstract
This article describes the construction and thermal characterization of a cryogen-free cryostat designed for single-pressure refractive index gas thermometry (SPRIGT) of helium-4 in the range 5–25 K. The system is cooled using a G-M type two-stage pulse tube cryocooler. The temperature can be controlled with a standard uncertainty of 20 µK over the whole working range. The use of a thermal switch to attenuate the modulated heat flux arising from the periodic temperature oscillation of the cryocooler is described. From the temperature evolution over the whole system the thermal characteristics are estimated using a simple model.
- Published
- 2019