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Research Project in Ultra High Vacuum Physics
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Personal Research Project into Ultra High Vacuum Physics
Nice project! Definitely educational, fun, and also a really cool thing to have in the garage. :)A few tips that might save you some hair:Below about 10^-6 Torr the seal types become very important. Plastic/rubber seals allow noticeable amounts of gas to diffuse through them. How much varies from plastic to plastic, with Teflon and Viton generally considered to have the lowest diffusion coefficients. There are certain vacuum compatible epoxies available for permeant seals as well.Also, below about 10^-4 Torr the gas remaining in a vacuum chamber is mostly water. The water sticks to the internal surfaces and gets pumped out very slowly. The water can be driven off with external heat or internal UVC (aka germicidal UV) to achieve a lower ultimate vacuum.If you need to weld anything exposed to vacuum, TIG/Heliarc is the way to go. That's the only technique that doesn't produce pinholes or 'virtual leaks'.Finally, FYI back in the day they used to use solder and copper pipe to make vacuum connections and it seemed to work fairly well. However this method has been abandoned in modern labs, probably for the same reasons as why we use TIG welding.You can also get vacuum parts, particularly things like ion gauges, from Duniway Stockroom. They're a pain to deal with (you have to call them on the phone for everything), but they do make good products.
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