Cryogenic radiator with cavity-in-cavity structure for space missions

Shinozaki, Kazuo; Nishikawa, Ikuma; Tanaka, Kazuo; Ando, Makiko; Sugita, Hiroyuki

doi:10.1088/1757-899x/502/1/012070

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…The 2 K J-T cryocooler obtained the cooling power of 19 mW at 1.77 K with the precooling temperature of 9.9 K provided by the 15 K PTC [23], which exceeded the performance with 2SC precooling.…”

Section: The 2 K J-t Cryocooler Of Athenamentioning

confidence: 87%

Status and development trends of the space 2 K mechanical cryocooler

Liu

Quan

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The space 2 K cryogenic technology is one of the critical supporting technologies for deep-space explorations. With the development of space detectors, such as infrared and X-ray detectors, the demands for the space 2 K cryogenic technology have become much more urgent. Early space detection missions used superfluid helium cryostats (SHCs) to meet their requirements. However, cryostats have been gradually replaced by the 2 K mechanical cryocoolers due to the large volume, heavy weight, and short life of cryostats. Hybrid JouleThomson (J-T) cryocoolers are the best alternative to cryostats in the 2 K mechanical cryocoolers because of their relatively higher efficiency at 2 K. This paper provides an up-to-date review of space missions involving 2 K hybrid J-T cryocoolers and a summary on the key issues that need to be solved in the 2 K J-T cryocoolers.

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Section: The 2 K J-t Cryocooler Of Athenamentioning

confidence: 87%

Status and development trends of the space 2 K mechanical cryocooler

Liu

Quan

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Since the JWST Observatory is too large to test thermal balance indoors, the thermal design relies heavily on simulation analysis. So, accurately measuring the emissivity of materials is of great importance to achieving the goal of tasks [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A review of devices and methods for measuring thermal emissivity at cryogenic temperatures

Zhang

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Thermal emissivity is an important parameter in characterizing the thermal radiative properties of materials and a critical factor in radiative heat transfer. The radiation of an actual object is different from that of the blackbody: its radiation energy varies irregularly with wavelength and temperature. To investigate the thermal radiative properties, thermal emissivity could be measured at cryogenic temperatures. In this paper, measuring methods and factors affecting the thermal emissivity of metals and infrared coatings at low temperatures were comprehensively reviewed. Two existing methods for measuring thermal emissivity at low temperatures, the calorimetry and radiometry methods, were described. Moreover, this work also discussed several factors such as material properties, surface temperature, and surface conditions. Testing devices for measurement of emissivity at low temperatures based on calorimetry and radiometry were reviewed and analyzed emphatically.

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Cryogenic radiator with cavity-in-cavity structure for space missions

Cited by 2 publications

References 5 publications

Status and development trends of the space 2 K mechanical cryocooler

Status and development trends of the space 2 K mechanical cryocooler

A review of devices and methods for measuring thermal emissivity at cryogenic temperatures

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