3He Dipper and Custom Vapour Shielded Dewar with Optical Access
A cryogen-free ³He system for use in a UHV environment, sample in vacuum, uses a closed cycle cooler with vibration eliminated by a bellows system. A 1K stage allows full condensation of the ³He charge which extends the hold time at a base temperature of 300mK to 40 hours, and gives a fast regeneration time.
The dipper insert with a large diameter is specifically designed to operate within the clear neck of a custom made vapour shielded helium dewar. The dipper will have a large sample space with room to mount various components to for experimental work. The height of the system was minimised where possible to ensure it will integrate into the purposed laboratory. The insert comes with a self-contained 3He gas charge and includes our patented condensation process.
The Vapour shielded Dewar eliminates the noise from boiling nitrogen. There is also a fixed impendane feed cappillary from the helium resevoir to the 1K pot to minimise high frequency vibration associated with the 1K pot needle valve assemblies. Vibration is also reduced through pressurisation of the cryostat to give the option of operating without the 1K pot pupm whilst still allowing a 70 hour hold time.
| Temperature range | 293mK to 500K |
| Cooling power | 50µW @ 325mK |
| Temperature Stability | ±1.5mK |
| Sample environment | Vacuum or exchange gas |
| Sample space | 150mm (custom sizes available) |
| Vibration at sample | ±20 nm with anti-vibration options |
| Cool down time to Base Temperature | <12 hours |
| Compressor | Air or water cooled options available |
| Wiring | DC, RF and fiber optic options available |
| Optical access | Up to five windows available including Sapphire, Quartz and Spectrosil (see window materials) |
| Base temperature | <0.8K |
|
Hold time |
Up to 100 hours |
| Temperature controller | Lakeshore 336 as standard (Other controllers available on request) |
| Magnetic Field | Solenoid, Split pair and Vector magnets available |
