What are the pros and cons of using glass or metallic dewars/cryostats?

[swooshfactory]

My question is specifically with respect to holding LHe and using these containers as the environment for experiments (so not just for storage):

Features to consider:

Price
Longevity
Necessary associated equipment (I know this could be vague, but the LHe glass dewar would be surrounded by an LN2 dewar + equipment to pump on the LHe dewar. I'm not sure what is necessary with a metallic cryostat)


I am trying to learn about metallic cryostats/cryogenics, so any information could be valuable. Linked examples would also really be appreciated!

Thanks!

 

[AndyW]

Thank you for your question about using LHe containers for experiments. As a scientist who has worked with cryogenics and metallic cryostats, I can provide some insight on the features to consider when using LHe for experiments.

Price is an important factor to consider when using LHe containers for experiments. LHe is a relatively expensive cryogen, so it's important to consider the cost of both the LHe container and the associated equipment needed for the experiments. In some cases, using a metallic cryostat may be more cost-effective than using an LHe glass dewar, as the metallic cryostat can be reused multiple times.

Longevity is another important factor to consider. LHe has a low boiling point and can evaporate quickly, so it's important to choose a container that can maintain the LHe at the desired temperature for the duration of the experiment. Metallic cryostats are typically more durable and can maintain the LHe for longer periods of time compared to glass dewars.

When using LHe containers for experiments, it's also important to consider the necessary associated equipment. This could include a vacuum pump, temperature controllers, and pressure gauges. The specific equipment needed may vary depending on the experiment and the type of container being used. It's important to carefully evaluate the necessary equipment and ensure it is properly set up and maintained for the experiment.

In terms of metallic cryostats, there are a variety of options available on the market. Some popular examples include the Oxford Instruments Optistat and the Janis Research Company cryostats. These cryostats have different features and capabilities, so it's important to research and compare them to determine which one best fits your experimental needs.

I hope this information is helpful in your understanding of metallic cryostats and LHe containers for experiments. Best of luck in your research!