Development of solid cryogen coolers for spacecraft instrument cooling has been in progress since 1965. To date six coolers of this type have provided orbital cooling for 7 to 12 months in a temperature range of 60 to 130 K. These systems have demonstrated the high reliability and excellent temperature stability expected. This paper summarizes some of these data and describes some of the more recent developments in solid cryogen systems.
T. C. Nast
"Status Of Solid Cryogen Coolers", Proc. SPIE 0253, Modern Utilization of Infrared Technology VI, (17 December 1980); doi: 10.1117/12.959513; https://doi.org/10.1117/12.959513