The MOS-unit installed in the test cryostat
The MOS-unit in the test cryostat. The focal plane unit is mounted to the center of the base plate (between the large support struts). The MOS structure attached to the lower right quadrant of the cryostat base plate carries the rails for the robot and the mask cabinets. The robot is partially hidden behind one of the support struts. Behind the robot, 4 mask frames are locked by the mask retainer. The box in the background controlls the tilt-motor of the cryostat.