Lake Shore SHI-950 Series cryostats provide cryogen-free cooling from 1.5 K to 325 K in a configuration optimized for optical and electrical measurements. Thermal exchange gas cooling is especially useful for liquid, powder, and irregularly
shaped samples that are not easily mounted to the flat surface of a sample holder. Samples can be exchanged without warming the cryocooler to room temperature, reducing turnaround time.
Continuous operation to 1.5 K is achieved through the use of a recirculating helium gas loop. Helium gas is cooled through a series of heat exchangers and then cools the sample chamber. The helium gas then exits the cryostat and repeats the cooling
cycle.
The SHI-950-LT offers rapid sample exchange. The sample is inserted, via a long rod, into a nearly isothermal region of the gas column for cooling. Sample exchange by simply removing the sample rod, switching samples on the rod, and reinserting the rod
into the cryostat. The entire sequence takes ~80 min and is performed while the cryostat is operating.
Neutron scattering configuration
The SHI-950-LT can be configured for neutron scattering. Modular tails can easily be exchanged for different experimental requirements.
| 1.5 K CCR part number | Optical | Maximum temperature | Cold head location | Sample environment | Cooldown time (min) | Sample change |
| SHI-950-LT | ✔ | 800 K | Top | Exchange gas | >9 h | <10 min |
| SHI-950T-LT | | 800 K | Top | Exchange gas | >9 h | <10 min |
| Cooling type | Cryogen-free |
| Minimum temperature | 1.5 K |
| Maximum temperature | 800 K |
| Vibration | — |
| Cryocooler | Gifford-McMahon |
| Cryocooler power options | 1 W at 4.2 K |