The AMS facility at Xi'an AMS Centre

The Institute of Earth Environment of the Chinese Academy of Sciences and Xi'an Jiaotong University have jointly created an AMS center, under the support of Ministry of Science and Technology, Chinese Academy of Sciences and Ministry of Education. The Xi'an 3MV multi-element AMS system will be a national experimental platform for earth environmental studies, archeology, biomedical research and other fields related to the AMS technique. This paper describes the AMS's major components with their unique features, including body grounded ion source accepting both CO2 and solid samples; low energy injector with precisely timing and fast switching; low radiation accelerator containing the accelerator tubes with combined magnetic permanent and declined electrostatic field suppression of secondary electrons; high energy analyzing system with high dispersion and slit stabilization. The excellent results of the acceptance tests for 10Be, 14C, 26A1 and 129I are listed. The 14C precision of 0.2% and the background for ratio 10Be/9Be of 3.65 × 10-15 were demonstrated.