> if you consider 10e-5 torr vacuum to be trivial Its not hard to achieve at all. Electron beam welders at work have 10E-6/10E-7 in the E-gun chamber all day l

> if you consider 10e-5 torr vacuum to be trivial Its not hard to achieve at all. Electron beam welders at work have 10E-6/10E-7 in the E-gun chamber all day long held by a little turbo or diffusion pump. The chambers aren't made from anything exotic just stainless steel and/or aluminum with viton o-rings.