Two stage coldheads
The Coolstar two stage coldheads comprise the 2/9 and 6/30 models, both delivering base temperatures below 10 K. These powerful coolers are still comparatively compact, lending themselves to a wide range of applications. The coldheads function independently of orientation, and should be used with the 3.0 kW Coolstar compressor
The Coolstar coldheads use the Gifford McMahon refrigeration cycle, and are driven by a small, low vibration stepper motor. This design offers the unique advantage that motor speed can be regulated to vary the cycle rate, and hence the cooling speed. The variable speed demonstrated by the coldheads lends itself to optimising the coldhead performance in terms of:
- Fast cool-down times, which are achieved by running the coldhead at boost speed
- Longer service intervals can be achieved by reducing the cycle to the lowest suitable speed after cool-down, meaning the wear on the seals is reduced.
The Coolstar coldheads run in conjunction with the Oxford Cryosystems Cryodrive, which delivers compressed helium for the operation of Coolstar coldheads and pumps.