Hi Alex,
I can explain only my experience. Actually I don't use those baffles.
Because I do IBAD coating for mirrors. During this process my ion gun needs gas flow to work properly. To maintain a working pressure I need as much pumping speed as possible. Those baffles, at least what I own, reducing the pumping speed to 50-60% of the original. This is not acceptable for me.
So if you need a clean low vacuum you should use those baffles. If you need to maintain a working pressure(tipically 1-5x10-4 Torr), you need high pumping speed instead.
Br.
Attila
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--- In VacuumX@..., "grossmann200" <email@...> wrote:
Based on the pictures uploaded by David and Attila (thank you both!), it is pretty obvious, that the baffle has quite some complexity. Most likely, a baffle maybe not so easy to build on your own.
So, there is the question:
- In which (coating-) situation do you really need a baffle?
Or to ask the way around: when would I not need such a baffle?
Cheers
Alexander
