In August/September 2020 a scheduled maintenance of WFCAM took place in order to replace the cold head. This involves removing WFCAM from the telescope, warming up the instrument, making the replacement and making sure other parts are all still in good condition, then re-mounting WFCAM and cooling the instrument back down again. This process occurs every 1-2 years. The pictures below document some of this process.
In this group of photos WFCAM is off of the instrument for the cold head replacement. (Photo Credit: Laurie Chu and Jessica Stasik)
After the replacement is made, WFCAM is re-mounted on UKIRT as shown in the following photos. (Photo Credit: Laurie Chu and Jessica Stasik)