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Janis VNF Series Cryostat Systems
Sample in Flowing Vapour
Ideal for samples with poor thermal conductivity, the VNF cryostat provides uniform cooling for irregularly shaped samples. Samples are cooled by a temperature-controlled stream of nitrogen vapour, so the cooling is not dependent on the sample mounting configuration or thermal conductivity. (A specialised model is shown)
For more information please visit Lake Shore Cryotronics
Standard configuration
The Janis VNF-100 cryostat is a liquid nitrogen variable temperature cryostat with the sample located in flowing vapour. Ideal for experiments with samples that are difficult to thermally anchor such as liquid or powder samples, the VNF-100 is a low-cost alternative to the SuperTran-VP or SuperVariTemp Dewars when temperatures below 65 K are not required. The VNF-100 features a top-loading sample chamber for rapid sample exchange, and four-way, f = 1.0, optical access to the sample chamber.
FEATURES
- Quick refill capability with included funnel assembly
- High-quality bellows-sealed evacuation valve and a built-in cryopump for maintaining high vacuum
- Safety pressure relief valves protecting all independent spaces
- 1.25 in diameter sample tube with customer-specified optical access (standard system offers four quartz window pairs with f = 1.0 optical access to the sample space)
- Top-loading sample chamber for rapid sample exchange
- Variable cooling system that places the sample in flowing N2 vapour (ideal for low thermal conduction samples), providing excellent cooling power and temperature control
- Lightweight sample positioner/mount assembly, with multi-pin electrical feedthrough access to the window region, offering rotation and translation around the cryostat axis
- Two silicon diodes installed on the vaporizer (heat exchanger) and sample mount for controlling and monitoring the system temperature
Optional equipment:
- Exhaust flow gauge for more precise control
- Special window materials and geometries (IR, UV, and x-ray)
- Special sample holders including four-point resistivity measurement and liquid cuvettes (see other configurations)
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VNF Series Specifications
| LN2 capacity (nominal) | 1.2 L |
| Working time (typical) | Approximately 6 to 8 h |
| Initial cooldown time (from room temperature) | Approximately 30 min |
| Sample exchange time (typical) | Less than 5 min |
| Operating temperature range | 65 to 325 K |
| Temperature stability (with temperature controller) | 50 mK or better |
| System weight | 19.0 lb (11.5 kg) |
