THE ULTRA-HIGH VACUUM PROTOTYPE OF HIRFL-CSR

The average static pressure for the ultra-high vacuum system of HIRFL-CSR will obtain 3×10-9 Pa. To achieve this goal, a lot of research and experiments have been done. As a result, the first prototype of the vacuum system has been finished. The pressure near the pump and at the end of the chamber (about 4m away from the pump) were 9×10-10 Pa and 3.6×10-9 Pa respectively. This paper mainly describes the process of the design, manufacture and test on the prototype. We focused on chamber structure design, the machining technology, calculating and the testing for the main pumps, and designing for the bake-out system.. The further development of the project on the vacuum system is also mentioned in the paper