The Coolstar two stage coldheads comprise the 2/9 and 6/30 models, both delivering base temperatures as low as 10 K. These are some of the smallest GM coldheads available, and can be installed in systems where space is at a premium. Coolstar is the only commercially available range of Gifford-McMahon Cryocoolers offering complete control of the Coldhead speed; by using a variable speed stepper motor and proprietary control software, every cooler in the range can be operated at speeds of 40-90 rpm.
The Coolstar range of coldheads may be used wherever a compact and variable speed head is desirable, in applications from laboratory cryostats to radio astronomy.