What is diffusion pump?

A diffusion pump is a type of vacuum pump that utilizes the principle of vapor diffusion to create and maintain a high vacuum environment. It is commonly used in various industrial and scientific applications where a high vacuum level is required.

The operation of a diffusion pump involves the use of a high-speed jet of vaporized fluid, typically oil, which creates a high-speed flow to capture and pump gas molecules out of a vacuum chamber. As the gas molecules collide with the vapor jet, they are carried away and expelled from the system, leading to a decrease in pressure within the chamber.

Diffusion pumps are known for their high pumping speed and ability to maintain a high vacuum level, making them ideal for applications such as thin film deposition, electron microscopy, and semiconductor manufacturing. They are commonly used in combination with other types of vacuum pumps, such as rotary vane pumps, to achieve the desired vacuum level.

Some key advantages of diffusion pumps include their high pumping speed, low maintenance requirements, and reliability. However, they also have limitations, such as the need for a high-temperature operating environment and the potential for contamination of the pumped gas with oil vapor.

Overall, diffusion pumps are a versatile and efficient type of vacuum pump that plays a crucial role in a wide range of vacuum applications.