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qet77 · 04-01-2006, 01:38 PM

Well, the system that we use is UHV so there are certianly big differences. An ion pump is used to get to very low pressures (10^-10 torr), but we do not have anything inside of the chamber that is powered. The one temperature dependant thing that is of concern is desorption of metals on the inside of the chamber. The rate of the desorption scales with the double exponential of temperature. I know of some people that had some problems with heat removal on a system that used much lower vacuum then we use ~10^-7 torr and a measurement component kept melting (very little current was being run through this ~microamps). So as the others mentioned the heat can add up fast. Is there some other calorimetric way of doing this in a highly insulated container?

04-01-2006, 01:38 PM	#6
qet77 Registered User Join Date: Feb 2006 Location: a Posts: 8	Re: Testing under vacuum Well, the system that we use is UHV so there are certianly big differences. An ion pump is used to get to very low pressures (10^-10 torr), but we do not have anything inside of the chamber that is powered. The one temperature dependant thing that is of concern is desorption of metals on the inside of the chamber. The rate of the desorption scales with the double exponential of temperature. I know of some people that had some problems with heat removal on a system that used much lower vacuum then we use ~10^-7 torr and a measurement component kept melting (very little current was being run through this ~microamps). So as the others mentioned the heat can add up fast. Is there some other calorimetric way of doing this in a highly insulated container?