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TY - UNPB AU - Xie, D. AU - Benitez, J.Y. AU - Lu, W. AU - Lyneis, C.M. AU - Todd, D.S. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Extending the Performance of Venus Ion Source J2 - Proc. of ECRIS2018, Catania, Italy, 10-14 September 2018 C1 - Catania, Italy T2 - International Workshop on ECR Ion Sources T3 - 23 LA - english AB - Continuing efforts to improve the VENUS performance, especially those started since 2014, have led to greatly enhanced source performance. Improved cooling of the plasma chamber and a slightly modified 28 GHz microwave coupling have resulted in reliable operations, increased injected power of up to 10 kW, and a substantial enhancement in VENUS overall performance. VENUS has produced the following ion beams: 600 eµA of 16O⁸⁺, 4 eµA of 40Ar¹⁸⁺, 17 eµA of 78Kr³¹⁺, 0.8 eµA of 124Xe⁴⁵⁺, 0.6 eµA of 197Au⁵⁸⁺ and 0.1 eµA of 209Bi⁶¹⁺. Compared to prior performance, ion beam intensity has increased up to a factor of 6 for the same high charge state and there has been an increase of five charge states upwards for Au and Bi beams where beam intensity is about 1 eµA. In addition a number of ultra-high charge state ion beams at lower intensities have been produced. With ion beams of 124Xe⁴⁷⁺, 48+, 49+ injected from VENUS, the total beam energy has reached a new record of ~2.6 GeV for a K140 cyclotron. VENUS produced for the first time oxygen charge state distribution (CSD) peaking at O⁷⁺ which is a good step for VENUS and a milestone for ECRIS technology, indicating that there may still be room for improvements. PB - JACoW Publishing CP - Geneva, Switzerland ER -