Diffusion Pumps

Diffusion Pumps

Diffusion pumps are a type of vacuum pump that operate by creating a high vacuum environment through the use of vapor diffusion. The pump consists of a heated oil or metal vapor source, a nozzle, and a condensation surface. The vapor source heats the oil or metal, causing it to vaporize and flow through the nozzle. As the vapor flows through the nozzle, it collides with gas molecules in the chamber and transfers its momentum to them, causing them to move towards the condensation surface and be trapped. This process is known as molecular drag. Diffusion pumps are commonly used in high vacuum applications, such as in the production of semiconductors, where a clean and low-pressure environment is necessary. They are also used in research and development, particularly in the fields of physics and chemistry, where a high vacuum environment is required for experiments. One of the advantages of diffusion pumps is their ability to achieve very high vacuum levels, up to 10^-10 torr. They are also relatively simple to operate and maintain, and can operate continuously for long periods of time. However, they do require a high temperature to operate, which can limit their use in certain applications.

vacuum pump, high vacuum, molecular drag, semiconductors, physics

— Mark Hall