Outgassing of SmCo Permanent Magnets Drift Tube and Residual Gas Analysis

This article explains the experimental principle of the synchronous gas path method to measure the outgassing rate of materials systematically. First, the outgassing rate of SmCo permanent magnets at room temperature is measured at different times and its fitting curve is given, which can predict the outgassing rate of SmCo materials corresponding to a longer period of time. Secondly, the total outgassing of the SmCo permanent magnet drift tube prototype was experimentally measured and compared with the total outgassing of the SmCo sample. It was analyzed that air inclusion was the main reason for the slow decline in the outgassing of the drift tube prototype, and an improvement plan was proposed. Then, the residual gas composition under different conditions is compared, and the analysis results provide improvement ideas for subsequent drift tube processing. Finally, the pressure change caused by the application of the SmCo permanent magnet drift tube in the DTL1# physical cavity was calculated, providing data support for the application of the SmCo permanent magnet drift tube.