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An overall outgassing analysis of the large, 14-m-long, ultra-high-vacuum aluminum arc-cell chambers of the Taiwan Photon Source (TPS) was performed using residual gas analyzer (RGA). Pumping primarily by ion pumps (IP) and non-evaporable getter (NEG) pumps, the cells obtained pressures of 6.4 × 10−9 Pa on average, and the main residual gas was H2. The pressure build-up method was adopted to investigate...
The pressure build-up method was suitable for diagnosing and qualifying the vacuum status in the chamber and thus can be applied to determine the maintenance and recovery of a large vacuum system. The thermal outgassing rate and the pumping speed can be estimated using this method. In its electron storage ring, the Taiwan Photon Source (TPS) contains 24 aluminum arc-cells that are 14 m in length....
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