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Reaching and Measuring XHV (  10 -12 Torr)

Reaching and Measuring XHV (  10 -12 Torr). - Luminosity for accelerators - Lifetime in storage rings. Reaching XHV is commercially easier than measuring it. A CERN modified Helmer gauge did measure 10 -14 Torr XHV is not official - Pressure  10 -7 Torr are still called UHV.

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How DID they make light bulb work ?

How DID they make light bulb work ?. ? Since 1800 the electric arc light was known. However, the life time of a filament made of carbon was poor. ? The problem was in obtaining a high enough vacuum in the bulb and getting rid of the oxygen in the residual gas.

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77 views • 7 slides

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Typical sublimation rate 0 - PowerPoint PPT Presentation

Reaching and Measuring XHV (  10 -12 Torr)

How DID they make light bulb work ?