| Table of Contents |
|---|
This is a beginner's beginner guide to vacuum theory. Into to vacuum Theory aims to reach a broad audience by using brief, conversational descriptions and avoiding the use of math or units; no science background needed. It incrementally introduces some of the concepts and language used in vacuum technology. Hopefully this lays a solid groundwork for future learning.
...
Units of pressure, log scales
UHV
Vacuum Chambers
The Chamber itself
just a box for holding nothing.
perhaps with holes to attach stuff, like pumps.
different pumps for different pressures:
Pumps come in many different shapes, sizes, and types.
When we want to get to really low pressures (which is most of the time here at LCLS) we use layered tiers of pumping: where we turn on one type, wait until the pressure stops dropping, then turn on the next, and again when the pressure stops dropping again we turn on a third type.
The first layer is good for pumping room pressure down through viscous flow and a bit into molecular flow. The second layer works best in molecular flow, and gets (Fun Fact: for similar reasons we have to use layered tiers of pressure gauges as well)
for more details on how they actually work, see the confluence page on vacuum pumps. and for that matter, hey while you're at it, see the page on gauges too, we layer those as well.
In Depth slides: Vacuum Science and Technology for Accelerator Vacuum Systems
...