Chen W, Li H, Zhu R L, Xue K J, Cao X, Lü Y J, Liu S J, Xiao Y C, Liu S M, Ouyang H F
Institute of High Energy Physics, Chinese Academy of Sciences (CAS), 100049 Beijing, China.
Rev Sci Instrum. 2019 Nov 1;90(11):113320. doi: 10.1063/1.5128553.
The China Spallation Neutron Source started delivering neutron beams to users in March 2018. To upgrade the beam power to 500 kW and improve the performance of the ion source, an RF-driven negative hydrogen (H) ion source is under development. The source has a silicon nitride ceramic plasma chamber surrounded by a 4.5-turn antenna. The plasma is ignited by a pulsed DC spark gap and then driven by a 2 MHz solid-state amplifier with a repetition rate of 25 Hz. The commissioning of the source started in January 2019. When uncesiated, it produced about 20 mA beam at an RF power of 32 kW and pulse width of 450 μs. This paper describes the configuration of the ion source, several peculiar technologies used in it, and the first negative hydrogen (H) ion beam extraction.
中国散裂中子源于2018年3月开始向用户提供中子束。为了将束流功率提升至500千瓦并改善离子源性能，一种射频驱动的负氢离子（H⁻）源正在研发中。该离子源有一个由4.5圈天线环绕的氮化硅陶瓷等离子体腔室。等离子体由脉冲直流火花隙点燃，然后由重复频率为25赫兹的2兆赫兹固态放大器驱动。该离子源于2019年1月开始调试。在未引出束流时，在射频功率32千瓦、脉冲宽度450微秒的情况下产生了约20毫安的束流。本文描述了该离子源的结构、其中使用的几种独特技术以及首次负氢离子（H⁻）束流引出情况。
