Video Credit: NASA
I had a small part in the development and construction of the Soft X-ray Spectrometer. In order to be sensitive to energy of individual photons, the detector had to be kept very cold at a very constant temperature. I was responsible for the analog electronics in the system that powered and controlled the last three stages of the refrigeration system. Our team was able to maintain the sensor array at 0.05 K (±0.000001 °K). That’s 5/100 of a degree above absolute zero.