A compact, lightweight and high efficiency cold finger ideal for applications in UHV environments - particularly in nanotechnology and nanomaterials characterisation - the Ultrastat offers:
- UHV-clean environment
- Simple installation and operation
- Low cost of ownership
Flexible UHV sample temperatures from 3.8 to 500 K
The Ultrastat is cooled by a continuous flow of liquid helium, and therefore can operate in any orientation.
- Because of its small size, only 1 litre of liquid helium is needed to cool the Ultrastat from room temperature to its base temperature of 3.8 K - taking just 40 minutes!
Samples can be mounted directly onto the heat exchanger, and temperature controlled between 3.8 – 500 K using a heater and rhodium-iron sensor mounted at the cold tip
Alternatively, the effective length of the Ultrastat into the UHV chamber may be extended by using a copper braid to connect the sample to the face of the cold tip
Standard interface mounting is via a DN40CF (70 mm outer diameter) conflat flange.
The Ultrastat is constructed entirely from UHV-compatible materials and can be baked to 500 K
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Specifications
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System components/options
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Operation
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Applications
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Images
Layout and dimensions
- Length from underside of CF flange to cold face may be specified at time of order
- Minimum 160 mm
- Maximum 350 mm
Specifications
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Temperature range |
3.8-500 K |
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Temperature stability |
± 0.1 K |
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Maximum bake-out temperature |
500 K |
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Cooldown time (from ambient) |
40 minutes |
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Cooldown LHe consumption |
1 litre |
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LHe consumption |
1.1 litres/h at 4.2 K
0.1 litres/h at 10 K
<0.5 litres/h at 150 K |
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Maximum cooling power |
1 W at 4.2 K |
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Weight |
1 kg |
Typical system components
- Ultratstat continuous flow cryostat
- Liquid helium transfer tube
- Gas flow pump and controller
- ITC503 temperature controller
- LHe storage dewar top fitting
- Spares kit
Options
- Alternative mounting flanges
- Transfer tubes
- Choose an LLT700 low loss LHe transfer tube for minimum helium consumption
- An automated needle valve can be fitted to the LLT to allow automation of the helium flow regulation and optimisation of the helium consumption
- Alternatively use a TTL200 lightweight liquid helium transfer tube