Re: [VacuumX] Re: Baffle design
- If your pumps are very clean, you may not need a trap.
If you are using mechanical pumps which are sealed by oil,
you will need a trap.
"clean" (no back-streaming) pumping techs include:
• turbopumps backed by a diaphragm, scroll, or dry screw roughing pump
• sorption pumps
My apologies if you stated you have existing pumps and I missed it.
On Nov 27, 2012, at 11:46 AM, Attila wrote:
> 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.
> --- In VacuumX@yahoogroups.com, "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?
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