In order to. improve the system vacuum degree, the HIRFL post-beam line vacuum system has been upgraded. At the same time, the positions or contents of the experimental terminal have been changed and a new curing cancer beam line has been built up. The length of the HIRFL post-beam line vacuum system has been added up to 128 m from previous 108 m. It is required that the system vacuum degree must not be lower than 1×10-5 Pa after upgraded. Fig.1 3hows a part of the upgrading HIRFL post-beam line vacuum system.
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