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Janis Recirculating Gas Coolers
Continuous Closed Cycle Refrigerator Cryostat
Ultra-stable cryogenic microscopy platform
The Janis RGC4-ST500 is an ultra-stable cryogenic microscopy platform, cooling samples, and devices below 4 K without the use of liquid helium. A closed loop of helium gas is cooled by a low-vibration pulse-tube cryocooler. The cold helium gas travels to the ST-500 microscopy cryostat through a flexible vacuum insulated transfer line. The gas cools the ST-500 sample mount heat exchanger, vacuum mounted sample, and thermal radiation shield before returning to the cryocooler for continuous recirculation.
The SuperTran product line has long been an industry standard for continuous flow cryogenic systems. Now, with the introduction of the recirculating gas cooler, these cryostats can be cooled without the need for liquid cryogens.
Typical applications include micro-PL, micro-Raman, and high spacial resolution imaging. The Model RGC4 pulse tube-cooled system can also be used with the ST-100 optical workhorse, the ST-200 non-optical system, the ST-300 compact unit for use in a magnet, the ST-400 UHV configuration, the ST-500 microscopy configuration, and the ST-500 based probe station.
Optional equipment
- Piezo positioning stages
- Short working distance
- Integrated objective lens
- Large sample volume
- Permanent and rare earth magnets
- Diamond anvil cell (DAC)
- UHV sample environment
- RF or DC electrical feedthroughs and wires
- Alternative window materials
- Transmission geometry
- Integration with spectrometers
- Compact geometry
FEATURES
- Pulse tube or GM cooler
- Cryocoolers with 1 W, 1.2 W, 1.5 W or 2 W cooling at 4.2 K available
- Compact tabletop size
- Adjustable working distance
- Multipin electrical feedthrough
- Control heater and thermometer
- Integrated gas handling system
- Dry scroll pump for gas circulation
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Recirculating Gas Cooler Specifications
| Temperature range | <4 K to 800 K |
| Temperature stability | ±50 mK at >5 K |
| Vibration displacement | <10 nm at all frequencies |
| Positional drift (typical) | ±10 nm (5 min) ±60 nm (30 min) |
| Cooling power | 100 mW at 5 K 600 mW at 10 K |
| Initial cooldown time to 4 K | ~3 h |
| Subsequent cooldown time after sample change (300 K to 4 K) | <60 min |
| Cryostat weight (ST-500) | 3.2 kg |
| Cryostat height (ST-500) | <67 mm |
