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Description
Using a split coaxial radio frequency quadrupole accelerator (RFQ) as the injector for a small-scale high-intensity cyclotron and adopting a bottom-to-top injection method, the aim is to fundamentally break through the flow intensity limit of the small-scale high-intensity cyclotron. Improving the vacuum level of the RFQ injector can effectively reduce the risk of micro-spark discharge, ensuring stable operation of the accelerator and thereby enhancing overall performance. To ensure stable operation, the vacuum level is set to 10^-6 Pa.Due to the large size of the RFQ electrode head and the relatively small flow conductance between each quadrant, achieving high vacuum and uniformity presents significant challenges. The lateral mechanical dimensions of the RFQ injector have a diameter of 271 mm, and the longitudinal mechanical dimensions are 1616.6 mm. To address these challenges, a molecular pump with a pumping speed of 1200 L/s is selected, and a symmetric double vacuum exhaust window layout is adopted. By positioning the exhaust windows in symmetric locations, each exhaust port can simultaneously act on two adjacent quadrants, establishing a full-space synchronous exhaust mechanism to effectively maintain the high vacuum environment of the RFQ injector, ensuring its stable operation, and thereby enhancing the overall performance and reliability of the entire small-scale high-intensity cyclotron.
