Abstract
The construction of a new vacuum system fabricated for pressure calibration in UHV/XHV region is explained together with the measurement of outgassing rate from an XHV chamber used in the system. The outgassing rate was measured using a test chamber by a throughput method after each treatment of the chamber surface such as electrolytic polishing, pre-baking in vacuum, and TiN coating. It was found that the outgassing rate of 3.7×10 -9 Pa m s -1 after electrolytical polishing could be reduced to 1.0×10 -13 Pa m s -1 after pre-baking twice followed by TiN coating. The outgassing rate was also measured by the pressure rise method using the whole XHV chamber, and the result was compared with that obtained with the test chamber.
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