Why not using a cryopump, e.g.: shi?
The initial costs are comparable to a turbopump, the maintainance costs are significantly lower.
The main reason why cryopumps are not standard for experiment chambers is that they vibrate (remember the 2Hz tf-tf-tf from the mono beamline at the Flash). I will get specs on the vibrations.
Back to turbos, an issue is to prevent the rotating alu blades from, e.g. falling screws.
-The standard solution is a net. The drawback is 25% reduced pumping efficiency.
-If we choose to mount the turbo to the side or upwards, we will not need any net. But the chamber will be less bottom-heavy.
